How to Check Parts of a Mobile Phone for Fault
Learn How to Check Parts of a Mobile Phone for Fault while Mobile Phone Repairing.
Here we will learn how to check parts of a mobile phone for fault when doing mobile phone repairing. In the mobile cell phone repair business, you will often have to check parts such as speaker, ringer, vibrator, coil, boost coin, On / Off Switch, Antenna Switch, RX Filter, PFO, BSI, Network IC, VCO, Audio IC, Power IC, RTC, Charging IC, CPU, R22, Microphone Interface, Bluetooth IC, Flash IC, RAM, Logic IC, UEM etc.
Card Level Parts of a Mobile Phone
In most cases, only card level parts of a mobile cell phone are checked for fault and then repaired or replaced with a new one. Card level parts of a mobile cell phone include ringer, speaker, microphone, vibrator, LED, charging connector, headphone connector, data cable connector, battery, battery connector, SIM card, SIM card connector, memory card, memory card connector, camera, camera connector, keypad button, keypad connector, ON / OFF Switch, Display, Display connector, Internal antenna and PDA.
Chip Level Small Parts of a Mobile Phone
Chip level small parts of a mobile phone include small electronics components like capacitors, resistor, diode, coil, boost coil, coupler, regulator, transistors, are rarely or not tested for fault. Mainly SMD Components are used in Mobile Phone and Smartphones. In case there is any fault in the track of the Mobile Phone PCB then it is solved or fixed by jumper.
Tools to Check Parts of a Mobile Phone for Fault
You will need following mobile phone repairing tools:
- Multimeter
- DC Power Supply
Video: How to Use Multimeter
How to Check Parts of a Mobile Phone for Fault
How to Check Ringer of a Mobile Phone
To check if the ringer of a mobile phone is faulty or damaged, keep the multimeter in buzzer mode and check the ringer. Value must be between 8 to 10 Ohms. If the value is between this range then the ringer is good and does not need replacement. If the value on multimeter is 4-5 or 12-14 then change the ringer.
Video: How to Check Ringer
How to Check Vibrator or Motor of a Mobile Phone
To check vibrator or motor of a mobile phone, keep the multimeter in Buzzer Mode and check the vibrator. Value must be 8 to 16 Ohms. If the value is between 8-16 Ohms then the vibrator is good. Otherwise change it.
How to Check Speaker or Earpiece of a Mobile Phone
Check the speaker / earpiece with a multimeter on Buzzer mode. Value must be in the range of 25 to 35 Ohms. If the value is in this range then the speaker / earpiece is OK and need not be changed. Otherwise, change the speaker / earpiece.
How to Check Microphone or Mic of a Mobile Phone
Keep the multimeter in buzzer mode and check the microphone. Value reading on the multimeter must be in the range of 600 to 1800 Ohms. There will also be a Beep or Buzz sound from the multimeter.
How to Check Keypad of a Mobile Phone
Keep the multimeter on Buzzer mode and check Rows and Columns or the Key Pad. If there is Beep or Buzz sound from the multimeter then Keypad is ok, otherwise it is faulty.
Battery Connector
Keep multimeter on 20V DC and check. Value must be 1.5 to 3.5 V DC.
Battery
Check voltage with a multimeter. Keep multimeter on 20V DC and check. Value must be 3.7 V DC or above.
ON / OFF Switch
Check voltage with a multimeter. Keep multimeter on 20V DC and check. Value must be between 2.5 to 3.7 V DC.
NOTE: Please note that only one side of the microphone will show value. If we check by reversing the Red and Black Probes / Test Leads of the multimeter and check the microphone then there will be no value.
Fault Finding of SMD Mobile Phone Components
Coil
Check the SMD coil with a multimeter on Buzzer Mode. If it is good then it the multimeter will give a Beep or Buzz sound. If there is no sound then the coil is faulty. Replace it with a new one.
Resistor or Resistance
Check it with a multimeter on Buzzer Mode. If it is good then the multimeter will give a Beep or Buzz sound. If there is no sound then the SMD resistor is faulty. Replace it with a new one.
Capacitor
To check SMD Capacitor with a multimeter on Buzzer Mode. If it is good then the multimeter will NOT give any Beep or Buzz sound. If there is sound then the capacitor is faulty. Replace it with a new one.
Diode
Check it with a multimeter on Buzzer Mode. If it is good then the multimeter will NOT give any Beep or Buzz sound. If there is sound then the diode is faulty. Replace it with a new one.
LED
Keep the multimeter in Buzzer mode and check the LED. If the LED is good then they will glow otherwise not.
Coil and Boosting Coil
Check for continuity. If there is continuity then the coil or the Boost Coil is good otherwise it is faulty.
Network IC
Use a Analog DC Power Supply to check Network IC. Switch ON DC Power Supply and call any number from your mobile phone. The Needle of the DC Ampere will start moving. This shows that the Network IC is OK and not fault.
Power IC and CPU
Adjust voltage of the DC Power Supply to 4.2. Place the Red Probe / Test Lead of the DC Power Power Supply to the “+” of the Battery Connector of the mobile phone and the Black Probe / Test Lead to “–“:
- If DC Ampere is over 6 then Power IC or CPU is damaged. Check by replacing Power IC and the CPU one by one.
- If there is no movement of the Ampere Needle of the Power Supply then the Battery connector, On / OFF Switch Track, RTC or Network Crystal is damaged. Give heat to these components using hot air blower. If the problem is not solved then check by replacing them one by one.
- If the Ampere Needle fluctuates below 2 ten there could be problem with software or RTC (Real Time Clock).
- If the Ampere needle stands at some fixed point then there is problem with the Flash IC.
- If there is beep sound from the DC Power Supply then there is problem with “+” and “–” or the mobile handset is short.
PS: When checking a faulty mobile phone with DC Power supply, connect the Red Probe to “+” and Black Probe to “–” of the Battery Connector of the Mobile Phone.
Notes
- Most mobile phone repair people and technician check only above parts to solve mobile phone hardware problems.
- All other parts including SMD electronic components and ICs are generally not checked for fault. There is no good sure test for these parts. The problem is either solved by jumper or by trial and error (check by replacement).
How to Check Parts of a Mobile Phone for Fault FAQs
How can I check if my mobile phone’s screen is faulty?
You can check if your mobile phone's screen is faulty by observing the display. If there are any cracks or scratches on the screen, it may be faulty. Additionally, if there are any dead pixels or if the screen is flickering, it may be faulty. You can also try restarting your phone or resetting it to factory settings to see if the issue resolves.
How can I check if my mobile phone’s camera is faulty?
You can check if your mobile phone's camera is faulty by observing the quality of the pictures and videos it takes. If the pictures or videos are blurry, out of focus, or distorted, your camera may be faulty. Additionally, if there is any damage to the camera lens or if the camera app is crashing frequently, it may be faulty. You can also try cleaning the camera lens or updating the camera app to see if the issue resolves.
How can I check if my mobile phone’s microphone is faulty?
You can check if your mobile phone's microphone is faulty by making a test call or recording a voice memo. If the other person on the call cannot hear you clearly or if the voice memo is distorted or barely audible, your microphone may be faulty. Additionally, if you hear any crackling or hissing sounds during a call or if the microphone app is crashing frequently, it may be faulty.
How can I check if my mobile phone’s speaker is faulty?
You can check if your mobile phone's speaker is faulty by playing some music or making a test call on loudspeaker mode. If the sound is distorted, crackling, or barely audible, your speaker may be faulty. Additionally, if the volume is significantly lower than usual or if the speaker app is crashing frequently, it may be faulty. You can also try plugging in headphones or an external speaker to see if the issue resolves.
Related Posts:
- How to Check Shorting in Mobile Phone with Multimeter
- Sections and Parts Inside a Mobile Cell Phone
- How to Identify Parts & Components on PCB of Mobile Phone
- Mobile Phone Repairing Testing Methods
- Mobile Phone Repairing Tools Supplier in India
- Mobile Phone Fault Finding for Mobile Cell Phone Repairing
- Counting Legs or Pins of IC
- Circuit Symbols of Electronic Components
- How to Increase Battery Life of Smartphone
- Mobile Phone Software Problems and Solutions
- How to Open and Disassemble a Mobile Cell Phone
Hi sir. I changed charger connector of customer phone, then I checked the voltage from the battery connector it shows reverse polarity, am just confuse please help…..
Replace the charging connector. It could be faulty.
Sir check Diode
sir both my Sim slot is not working and the imei is empty have tried this code*#06# but got nothing
pls what to do
Please Read: http://www.mobilecellphonerepairing.com/how-to-flash-imei-number-in-android-mobile-phone.html
Great teachings
You the best
Sar ap you tube par bhi video baniya kijiye jise or bhi nalej mile har modal ka
Hello sir…
Mi 2s dead condition i try to solve it.im checking battery connector one side it giving value is above 800 and opposite side it giving value is below 400. I think its off shorting. Near power ic silver (cement or Grey) color all capacitor are making beeb sound
You won’t find those components. Better to change the Board.
Hello sir, is it possible to unlock icloud on iPhone 6 plus?
I have tried every method but to no avail.
How did this Problem Happen? What did you forget? Did you Try: https://iforgot.apple.com/password/verify/appleid
Last Option is to Flash the iPhone.
Sir the lower part of touch of my phone (mi4)does not work but there is no crack on the sreen so my question is is there any problem in the motherboard
You may have to change the Touchscreen (PDA only NOT the Display).
how to replace a capacitor and resistor on a samsung phone
Most Technicians just don’t bother to replace the Tiny SMD Capacitors and Resistors. They just remove them using soldering iron and the phone works fine. But if you can get the Capacitor and resistors then replacing is easy. Just desolder the faulty ones and replace with New ones using solder paste and hot air blower.
Sir,
Gionee gn 5001s switched off after the battery went 0%.I tried to charge it but it didn’t charge and so never turned on.and I have also boost the battery but same problem and I have changed a new battery but same problem. Leaving the battery for long inside the phone will completely drain the battery but still not power on. I need help
There is shorting near the Battery Connector or Power IC. It has to be checked properly.
Network IC: Use a Analog DC Power Supply to check Network IC. Switch ON DC Power Supply and call any number from your mobile phone. The Needle of the DC Ampere will start moving. This shows that the Network IC is OK and not fault.
i didnt understand..
Hi sir I have Micromax AD4500, I check that no short and also cheked on /off switch voltage all are good but still it dead please help me sir how to solve pls
Hello sir my self pasha.
Sir m seeing some mobiles are same problem only red light blinking phone r totally dead when i was chehk hard ware its ok software also ok but mobile phone totaaly dead how can i deduct the problem
Mother board.. Is totally in good condition …no short ..but not getting switch on. …..battery OK.. . ..any solution
Phone not getting switched ON means there is problem in the power section. There is no easy solution. the board has to be checked thoroughly.
Do a video on understanding phone Powe section
OK, will do soon.
I Have given phone to repair in one big company and not service centre
as service centre told that PBA/Front camera/ and charger ports is damaged due to water and it is not covered under warranty so they have given repalce cost of 17000/- of c9pro
and one company claims that they repair motherboard and it doesn’t require to replace so i gave the phone to them
now the company after taking phone for repair call back me for screenlock code and open phone and said phone started but after someday when they didnt return phone i call back and ask for phone they said phone display not working and spcb not working
so my question why they taken the screencode and said phone is ok
2 the samsung service centre said the pba is damaged and not the display then now how display is damaged
so when they return my phone back they didnt repair and send me back as it is but without display and i didnt accept it as there was no display in it
afterwards they again return my phone with display biut there were scratches on it which doesnt belong to me
so now how can i check whether the display belong to me is there any mark or identification no on display to check with imei of phone
please help me out how to check it
No, you cannot check with IMEI. Original Display will be Bright Enough. Duplicates will have Dull Brightness.
Hi
Thank you for this helpful Article
I have my Samsung S3 mini stop working (black screen .. doesn’t show anything.. and won’t turn on )..do you think is it software or hardware problem ? if it is a hardware problem how i can check it?
thank you
Could be problem with the Board. Get it checked.
thx for your reply
if it is problem of Board.. do you thing it is repairable?
Yes, it is repairable.
Thank you..
and do you think the lost Boot make this problem?
Hello mr Santosh please how can i use my IMEI to track my phone either on website or any application
my micomax x551 not charging through adapter but separately through Battery charger but stilll not getting switched on.
my mobile micromax x551 feature phone is not working as once charged through charging point gets heated and also not getting switched on no led light fluctuation no display,charged by connecting the charger to multi-use charger and got it charged but still phone not getting switched on.Kidnly help
Hello sir , micromax a94 charging shows but not store in battery, charging shows below 2.9 volts on batfery connector , how it will solve, i am waiting ur rply
It looks like false charging. Get the connectors checked.
Change the charging port and if the problem did not solve Use zener diode to work it.
Hi
Sir I have learnt mobile repairing an year ago through skill India. Your article helped me remembering many things.
Thanks for sharing.
Dear sir i want to Samsung E2152 power key track
Please search it on Google. I don’t have it.
Sir these test doing with on mobile or mobile off condition on pcb..
Mobile OFF Condition.
hello sir i read your article about identifying shorts in PCB, however am still a bit not sure. the question that i want to ask is that can one bad capacitor cause the other to bee or get bad?. reason being is that am checking my note 4 board for shorts buy while doing so i found out that when i test more than one capacitor their is a bee sound.
No, One faulty component will not damage the neighboring components.
Hello sir, my Samsung J7 Pro 2017 fell off from my pants pocket to the floor while I was sitted down on work (it fell with the screen facing upwards). When it hit ground, this weird white squares appeared on the screen, but they instantly disappeared, and the screen didn’t showing anything., except for a strange red/white flash every 10 seconds or so. The phone also vibrated whenever the flashes occured (a short vibration, like the one that happens when you turn on the phone, or put it to charge). At this point, I thought that it was the screen that had broken up, but later, some loud, annoying sounds could be heard from the phone, they were like strong buzzing sounds. They eventually stopped, but came back every now and then, and only stopped completely when the phone finally ran out of battery. Could you please help me with this problem? Could the motherboard have been damaged with the fall, being that the reason of the sounds? Or are they related to the screen?
Yes. Could be problem with some component on the PCB. You might have to change the PCB.
How to find out if fault in mobile phone sir
I have already written several Posts on the Topic on this site. Please read them.
Sir,my phone Gionee M5 lite switched off after the battery went 0%.I tried to charge it but ,it didn’t charge and so never turned on.I took it to a local repair shop,he told me that the ‘Power IC ” has got damaged so you’ll need to change the mother board.It’ll cost around Rs.5000!!What should I d0.
Can you remove the Battery? Is it Removable? Is yes, then Boost using Battery Booster. It will cost Just Rs. 10/-.
Hi sir , my Sony xperia c4 dual is showing a message ” unfortunately, system ui is not support ” and | phone is not connected through datacable to laptop or PC to diagnosed problem please give solution on how to connect phone with laptop or PC to repair it
Hi sir, this is harish. My Micromax canvas express 2, is getting heated very much, if I speak continuously for 10 minutes, is there any solution for this?
Reset the phone and get the software / OS reloaded by some good technician.
Sir how can I solve “illegally use will be powered off soon”in mobicel slim
Flash the Software
hello sir
i have dead Huawei p8 mobile phone, when i trying to insert a new battery or old its getting hot like burning in 3 to 10 seconds, same heating with connecting to power supply also. if connect to supply more than 10 seconds there is smell like burning.
i jave trace the charging section is heating.
please help sir , which part is faulty
Change the battery connector.
hello sir
i also replace the sim connector, but still same issue.
before charging connector replacing the consuming current (amp) is around 4.5 now around 2.4 , but heating same.
the charging connector value is around 290. and another side no value. its look like ok.
same value when i remove connector and check the connector point.
Good day Sir, how can I fix Nokia C2 displaying contact service
Sir can we solve any mobile phone without fail.?
In some critical cases, you can’t.
Sir please can have your email address so i can send you some Chinese mobile pcb board pictures that i am having problem solving the charging system so that you can show show me how to go about it. Thank you sir i like your site Alot it has made to become the best mobile repairer in my area for now thanks.
Sir can you please help me?
I have samsung cdma sch b339, the mobile is full short.
I have go to many mobile shop but nobody repair it. So I have decided to repair by myself.
I have seen many video on YouTube and I have checked that my phone PCB has many shorting capacitor and ragistance, so I have removed those by checking multimeter.
Now my phone is on but phone is not showing the network tower.
The phone is accepting the sim on starting like Tata or MTS but after starting the phone, the phone showing searching and after that phone shows that No service……..
So can you please help me in this problem, I want to repair it…..
Check the Network IC. Also Upgrade the OS.
but sir ,i need a job i know how to repair
Try to get some Job at your local area or better start your Own Business. You can Earn Good Money.
Nokia c1 01 No screen &keypad light problem after water damage what is solution ?
Disassemble the Phone. Take out the PCB. Clean with IPA or Alcohol and allow to dry. Now Apply FLUX all over the PCB and Apply Heat from some distance using Hot Air Blower. Assemble Back and Check.
Sir plz tell me how to remove half shortage…..
How to confirm Mobile phone pcb is ok
What is the main problem with your mobile phone?
Sir ,How To check Handsfree Interface On Nokia 230 pcb
My phone touch screen is passing obstructively what to do ?
See if the connector is lose. Clean the PCB with IPA. If nothing works then you might need to change the Touchscreen.
Sir’ I live in dist.Cachar state.Assam. I want to learn mobile repairing in fully completely as like chip level. Sir where I found the institute for that. ? Tell me a direction.
You should find some good Institute in your local area.
Hello sir my android mobile spice 525q is no service bta rha hai. .how to check contiti. .or kitni contiti honi chahiye. .. plc btaye…thanks
Clean the SIM connector and the SIM with IPA. If the problem is not solved the the SIM might also be faulty.
help me my phone PC just stopped to power on
Is it possible to repair fully shorted mobile?
Hi sir mujhe mobile repair Kaise karte hai Sabh Mail me dona
I havr asus zenfone 5 , it has 2150 mh bettry backup , but actully it does’t work only 2 hrs , although it have to works minimum 6 hrs , but thier bettery not working good , although i changed the charger and its Data cable for fast charging and keep maximum time on bettry time duration . But still not stays for long hrs ? What should i do ?
I just insert the dc power suppley to a samsung galaxy y phone to check but i just forgot to regulate the voltage for 3.7 and at that time the voltage was 11 so waht may be happend to that phone??
Don,t worry. It is DC Power. There will be NO Damage.
Samsung galaxy A7 2016.
On dead condition. When i checking on analogy dc power supply,
Taking ampires around 20mA to 35mA
Then again 0000.what would the problem.
Plz help me….
hi sir
Sir
my mobile flash light is not working i change the led bulb but still not working and usb malfunction jab pc say connect karain gay tu message ata hai usb device is not recognize Please tell me is ko kaisay repair karain gay
Which Phone do Your Have?
my nokia 1100 ringer is not working after first step jumpering
Hello Sir
My mobile phone is draining its battery really soon.
I replaced the battery but it didnt make much of a difference.
I also replaced the charger and the cables.
According to your knowledge, Do you think its Power IC fault?
Thanks
I don’t think there is any fault in the power IC. Which Phone are you using? See if the battery is Loose or Not. Also remove unwanted Apps and make proper settings for display, wi-fi, Bluetooth etc.
i want to apply for a certificate training from you sir, if u don’t mine pls.
Please get enrolled in some reputed institute and get proper training.
Hello sir, can call you ?
No. I am too busy will several projects.
Hi Santosh, I have Samsung Galaxy Note 2 4G model # SGH-I317 (AT&T model from US) which I had been using for past 5 years. Recently phone fell down and stopped responding. When connected with charger over night no progress is shown on the screen other than Samsung Galaxy Note II message. I recently got it check in open market and some said motherboard is not working, charging IC, is not working,etc. No one have this model component and telling to change with Indian component which is 3G. Now I have decided to self repair my phone. Can you guide me and help in this project to idenfy and rectify what part or component on the circuit board need to be replaced so that this carrier locked phone can become reusable. Thanks in advance.
Bhai mere pas ampear vala DC he mujhe power ic ya cpu karab he kese pta clega….
Use your DC Power Supply like a Multimeter.
sir i find out power on/of is under voltage what to do.
Replace it.
please let me know various problem solutions of a smart phones and the way to check it through multimeter and PCB it will be very kind of you
Repair and maltimitar solution reply
thanx a lot sir I am from Maharashtra Latur dist. Udgir. Generally ICS are not available so from where should we buy and LCDs and touch of good quality c/c mic speakers please suggest
fine sir its great to have you may God bless you . Sir how to learn a chip level work where is your institute and how much fees .please respond .
I had my own institute but in West Bengal but it is closed now because I am too busy with my other projects. I don’t know your location but there are many institutes in India providing Chip Level Training. I will suggest you to visit any Samsung Service Center and talk to the person doing chip level repairing and ask for some good institute in your location.
Why Nokia Mobiles short using after DC supply machine. After that mobile short only in Nokia tell me pls. Why happen
There could be short in the pcb.
Thanks soooooooo much i like you!
Hi sir How to identify power ic , network ic etc….. Pls tell me sir
I have already written an article on How to Identify Part of Mobile Phone. Please read it on this website.
tecno y4 is decreasing charging, what is the solution
Replace the battery and check.
Hello sir how to identify basic components such as resistors capacitors etc. In a mobile motherboard
Please read my post of small and big parts of a mobile phone.
Really good site
Thanks.. God bless you
Got a broken phone and it is probably the Power ic. Now, is it possible to take the Power ic from another used phone (same modell) or is it just a bad idea?
I just want to make it work so I can recover pictures and stuff. So it does not have to be a “good” fix that make the phone work for a long time.
Sir ,
i started learning ,mobile phone repairing ,my question is -if customer brings mobile phone which is not working and he may not knowing the exact problem what are all the things we need to check first ,can u pls. explain me with steps .
V nice brother
Thank you very much for all your work, Santosh. It really helps.
Best regards from Brazil.
Janab
sms mein “r” Key kaam nahi kar raha hai
mi a120 Hai plz help me
Hello sir any death mobile solution please
How to check whether a mobile is short or not, by both analog and digital multimeter?
And i got 2 new mobiles like a month ago but when i check them by connecting opposite colour probs to the opposite colour battery connector of them, the needle of analog multimeter moves slightly and go forward and remain there, i have read that if the needle of analog multimeter moves forward even a little, it means that the mobile is faulty and short, but both of them work fine. When i checked them through dc power supply, there was no sign of any short. So plz clarify?
Hi: I have already written about how to check Shorts.
HOW TO CHECK
CELL PHONE CARD LAVEL COMPANENT INTER FASE
I WANT TO HOW I CAN REMOVE HEADPHONE ICON FROM DISPLAY. PLEES
Factory reset the phone.
HI , Thank you for your help ! How do i know the components name ? for an example : if i have galaxy device and if i want to locate the power IC , how do locate that component ? I will waiting for your response . Thanks mate!
Please check out my post on “Small Parts of a Mobile Phone”. Thanks.
1)In Multimeter which one is good digital or Analogy
2)If digital meter first Where can i set the for check ohms
1)In Multimeter which one is good digital or Analogy
2)If digital meter first Where can i set the for check ohms(In multimeter)
3)If Analog meter first Where can i set the for check ohms(In multimeter)
Hi sir i like ur site very much.body of my cell phone is short .how can i solve this problem.
I really did not get your question.
Hi sir i like ur site very much.but i have a problem,body is short how can i solve this problem
thank you
Welcome.
Hi sir where r u?
Aoa Sir very nice l like it. Sir plz send me Iphone like 4 4s 5 5s repairing tips to my this Gmail address plz.
Sir mujhe mobile ki pcb track check kaise krte fuse coil capcatrs digital mieter me kiase check krte hai video chahiye
jai bigyana…
Sir how to check series current in tablet
THANKS FOR ALL
this is a great site,
iam not a technician but i visit this this web page. Now i would like to achive a tech..
very very thanks to all.this articles very usefull…….
Hi samsung v3303 no network problem
My blackberry turch1 phone is draining fast the battery., pls what’s your advice.?
change your charging IC
My nokia c1 is dead on/off swicht voltag 1.43v how to solv
Can u explain the cool testing,hot testing,parallel track and series track
Hi, Great site. My Samsung Galaxy Y. switches on but will not get past opening flash and SAMSUNG letters will not go beyond this and when I press off/on with operation key it just goes back to same. Any ideas.
Thanks,
Fred
Reset the phone and check. It the problem is not solved by flashing then you may have to reload the software.
Using Odin flash tool reset your Samsung device, the problem your phone is exhibiting is referred as boot loop.
Iphone 3g heating problem near power control ic, check the capacitor as said beeps ?, battery charging connector on logicboard shows 0.7 v on charger plugged , charging port Ok .pls help
Hello
How to solv problem
Tellme. How solv the problem
Yes i reset the phone and other sim check but not ok
Check if your IMEI is displaying by dailing *#06#. If blank rewrite IMEI using SN rewrite tool.
Correct
My nokia mobile problem
“Invalid sim” how to problem solv
Reset the phone and check. Also try to change the SIM and check.
Hello thanks for detail this is very help full for me
Cant hear callers voice in mobile earpiece ,but can hear in loud speaker what is the problem and how to rectify
The speaker is damaged. Change the speaker.
Da,
I have Karbon a21 the power on mother board is OK but no display. I changed the display but still it is blank and the display is getting hot at the bottom. What to do now?
There is some short in the phone. The phone Karbon A21 has faults in its design and manufacturing. This is a common problem in all A21. It is better to get rid of the phone and buy a new one. Any money you spend on its repairing will be waste. Never trust Karbon.
Very useful tutorials… Thanks a lot…
My mobile phone is turning off. when headphone jack through 9v dc supply.whats the problem.
thank !!!
There is short at the headphone connector. Take it to service center.
is ur collage in jalandhar punjab state thanks
No. It is in West Bengal.
good site.I like.
thanks
hi ray,
is there any institute of urs where i can learn mobile repairing course
thnks
Yes, it is DIY Education Pvt Ltd Based in India. Are you from India?
Hi,I’m highly impressed by your tutorials they’re are top class and easy to understand and moreso highly factual I want to say its one of the best I’ve come across on mobile phone repairing tech.Keep the good work up.Please can you send me some tutorials on mobile phone jumper setting I’ll be very grateful.Thanks.U can use my email to reach me.
Very very thanks it is great knowledge in this site .
you done it best thanks!!
I love This site
this offers useful guide to beginners in cellphone repair.we would be glad if the info is more comprehensive. thanks a lot
Hi sir
I like this site and i learnt so many things .
and i m very great full to you.
You are welcome.
pls i want to knw hw use analog meter to phones component.