I have to replace the t-con board, but can't find where is it in service manuals, I opened the tv but just find pwd, analog and digital board.
Assuming this is the same as my jvc 42x788 the small t-con board is near the top of the tv. It's behind the main panel that the other boards are mounted to. You don't have to take that main panel completely off, just take enough screws out to pull it out far enough to reach the t-con board. Also watch for any wires that need to be unplugged to get more room pulling the top of the panel out.
SOURCE: JVC LT 42x688 no picture just sound
Sorry, this has no easy fix. The good news is you do not need an LCD Panel. The bad news is the Video Processor has a problem.
This TV has x3 Boards. The one you should replace first is the one in the middle. If this doesn't fix it, try the one on the right. The Part #s are on the Boards if you wanna try ebay.
SOURCE: I have a JVC LCD
You need an Analog Board. It is the one in the middle. You can find it on ebay for $50 I think.
try safemanuals.com for online manuals or elitezoom.com
SOURCE: JVC LCD TV LT-42X688-powers on, blank screen. no picture,no sound
Hi , I have the same problem with my LT-42X688,so i called the service of my extended warranty provider . the TV technician just left and told me the motherboard is the problem. he said its the third one this week he has seen with the same symptoms. he ordered the motherboard and i've got to wait 5 to 7 work days before the part will be in . I will keep you posted when the guy will return.
SOURCE: Not able to scan for digital OTA channels on a JVC LT-32X667 LCD
Seeing as it does not have a digital tuner in it, I would think this would be the problem, you will have to get a box for it.
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