[GTALUG] war story: fixing an LCD TV
D. Hugh Redelmeier
hugh at mimosa.com
Thu May 30 13:41:18 EDT 2019
My 39" UltraHD TV, the one that I used as my main computer monitor for
almost four years, stopped working.
The symptom was that it just would not turn on. The status light below
the screen stayed red, meaning something like "standby". Normally it
turns blue when I'm using it.
Googling and watching YouTube videos convinced me that there was a chance
that I could repair it. LCDs seem to have certain standard PC boards.
- T-Con (timing control)
- power supply
- processor
- LED light & video driver
Replacement boards are reasonably inexpensive, apparently from chop
shops (i.e. they buy broken TVs and sell the working parts).
This shows someone fixing my model of TV.
<https://www.youtube.com/watch?v=XD7rIEgYULI>
>From my research, it seemed as if the most likely problem would involve
the power supply module. I could get one for US$~20 + ~$20 for shipping.
I opened up the monitor and examined the entrails. There was a burnt spot
on the power supply board. I posted my problem to the BadCaps.com forum
and got encouragement that a little bit of solder would fix the board. I
tried this, and it worked. At least for now. I'm using the monitor to
compose this mail.
<https://www.badcaps.net/forum/showthread.php?p=898646>
I spent several hours researching and perhaps an hour disassembling,
soldering, and reassembling. It might not have been worth that time given
the value of the monitor ($350 original price, but used for 4 years and
obsolete). I find it satisfying to fix a hardware problem, even though
I'm a software guy.
Summary: not all hardware problems are hard.
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