LCD TV set with strange symptom repaired. Model: JVC LT32R70SU
A friend of mine, also a computer technician brought this LCD TV to my shop for repair. I powered it up to see what was the problem. I did not see any kind of problem with it till I let it run for about twenty minutes. The customer explained that while he was watching the football game late at night, he was able to see this problem. The display on the screen was turning to black for only a second or so then the picture appears again.
Here is more information found on the back of this LCD TV set. It is an old set and it was heavy to carry which mean, quality in my opinion.
I lot of screws were taking out but finally, the back cover was off and here is what I saw.
There are a lot of boards inside but do not let scare you. It is still an LCD TV. If you understand one, you understand most of them.
To be honest with you, I did not know where to start. I have not seen this kind of symptom before. I went online and looked for such a problem and I talked to some repair technicains and all of them told me it has to do with unstable voltages on the power supply side or a bad T-Con board.
Here is the power supply and all the voltages were steady during and after the problem. So, we are on the safe side there.
I was thinking of either a bad T-Con or simply bad soldering joints on the inverter board.
My thoughts were on the inverter board rather than the T-Con one. I decided to re solder every single joint on that board. I used also my Kada re work station to re work the main IC’s there. I know it was a far shot but I was willing to give it a try. It took me forever to do that.
When I was done with the re soldering, I put everything back together. I was really happy to see that the problem disappeared. It was working fine again. I was so glad to see all that effort spent on that TV was met with success.
I let it run for about three hours and closely watching it. It passed the test. Mission accomplished.
This article was prepared for you by Waleed Rishmawi, one of our ‘Master Authors’ and currently working in the Bethlehem area of Palestine repairing electrical and electronic equipment.
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mosbad
July 19, 2014 at 3:18 pm
Waleed is doing a very good job here, pains taking coupled with experience, kudos for jobs well done.
Thank you and God bless.
Mosbad
Waleed Rishmawi
July 21, 2014 at 3:52 pm
Mosbad: thank you very much. have a wonderful day
Robert
July 19, 2014 at 3:26 pm
Well done Waleed. That non-leaded solder really causes a lot of bad solder joints. We don't see "Made in the UK" very often. The Peak Atlas meters say "Made in England" on them.
Waleed Rishmawi
July 21, 2014 at 3:54 pm
Robert: thank you my friend. cool
yogesh panchal
July 19, 2014 at 4:48 pm
good attempt thanks for sharing.
Waleed Rishmawi
July 21, 2014 at 3:54 pm
Yogesh: you are most welcome
John
July 20, 2014 at 2:08 am
I highly respect your articles that I have never miss.
This time I have a question, and i believe you can help.
I have an LCD TV PHILIPS 32HFL5561H. The simptom is IT HAS NO POWER UP AND ALWAYS GOES TO STANDBY. I checked the voltage at PS-BOARD at 2 Jacks connectors to the Main-Board, it has all 12V, 3.3V STBY, and 0v BL-ON, 0v DIM.
At the MAIN-BOARD I can see one of the LED light is ON just for 5 Second and then disappear, as the TV shut down again. ( I still can hear a shut down sound from the speaker. (12V for Audio at the PS-BOARD is functioning)
Do you have any idea why this tv SHUT DOWN AFTER 5 SECOND ?
Your support is highly appreciated
Thanks,
John
909-9467816 (USA)
Waleed Rishmawi
July 21, 2014 at 4:01 pm
John: you are most welcome.
about the fault, the voltages you are getting? are they steady or they disappear when the TV shuts down. when the TV shuts down like that, I always check capacitors in the power supply or it might that the one of the high tension transformers gone bad. did you check for bad capacitors? let me know your findings.
daniel
July 20, 2014 at 3:34 pm
Well done Waleed and thanks for sharing
Waleed Rishmawi
July 21, 2014 at 4:02 pm
Daniel: you are most welcome.
Luciano
July 20, 2014 at 9:36 pm
Hi Mr. Waleed,
I appreciate your articles thanks a lot. Mission accomplished indeed!
Waleed Rishmawi
July 21, 2014 at 4:02 pm
Luciano: you are most welcome.
Uday Kumar Vasudevan
July 20, 2014 at 10:26 pm
The problems given are what you have faced realty , interesting to read and get knowledge from you .
Uday Kumar Vasudevan
July 20, 2014 at 10:29 pm
I want knowledge about frequency drive repairing any help will be appreciated
Waleed Rishmawi
July 21, 2014 at 4:03 pm
Uday, sorry I can not help you in this field.
Joshua oloo
July 21, 2014 at 1:18 am
Thanks for sharing that informative Article.you inspire and encourage me on matters repair.God bless you.
Waleed Rishmawi
July 21, 2014 at 4:05 pm
Joshua:you are most welcome. I am glad it encouraged you to do more repair. God bless you too.
Andre Gopee
July 22, 2014 at 7:07 am
Hi Waleed, thanks for sharing.
Emmanuel runda
July 22, 2014 at 11:50 am
Dear Mr. Waleed am so greatfull your posts widen my repair knowledge. I rather have a different scenario, its a sum sung LCD screen that had no picture display but sound OK. Upon troubleshooting I realised that the the fibre to the screen had a short circuit. Is there any possible way I can bring this screen back to life?
kamran
July 22, 2014 at 5:39 pm
good work
Humberto
July 22, 2014 at 9:36 pm
Good idea and attempt with no-lead solder. Have a good day.
Alex
July 29, 2014 at 2:22 am
The vast majority of LCD TV unaffected by temperature in this area. Great job, thank you very much for the information.
Raymundo Saura
August 27, 2014 at 3:44 pm
thanks sir great article
Mahmoud
September 8, 2014 at 11:02 pm
Well done Mr. Waleed and thanks for this article the LCD TV repairing is hard in troubleshooting
Ivan
June 3, 2020 at 2:10 am
thanks