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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