I recently picked up a Vizio SV420M LCD TV that had gone through a lightning storm. It does not turn on at all. I believe I have narrowed it down to the main board being bad (at least) but would like some input from others. The 5 amp fuse did not blow, has no extra resistance. I have tested the power supply/inverter and backlight, they seem to work fine, the 12v will output when the power supply is forced on, both backlights work when the inverter is forced on. The weird thing is that when the left TCON board cable (right cable on the main board, the wider one) is plugged in, the backlight does not come on when forced. I don't see anything burnt or obviously damaged on the front of the TCON board. In any case, the TV doesn't respond at all regardless of the setup, the Vizio logo doesn't light up at all either.
Would buying a $20 TCON replacement be worth getting first over a $100 main board replacement, or would you even bother with the TV due to the risk of having a damaged panel? I'm not sure how much damage the small (I'm assuming since the fuse is fine) surge could do to the panel itself. There is also a 6 piece repair kit for the main board for ~$30 but I think it's all surface mount replacements and I'm not really wanting to try surface mount soldering. There is also a $30 EEPROM chip replacement, but same deal with the soldering, and I don't think that will fix what appears to be a dead main board. I don't really have any extra parts or major equipment to do any further diagnostic with, only a DMM. Thanks in advance for the help.
Would buying a $20 TCON replacement be worth getting first over a $100 main board replacement, or would you even bother with the TV due to the risk of having a damaged panel? I'm not sure how much damage the small (I'm assuming since the fuse is fine) surge could do to the panel itself. There is also a 6 piece repair kit for the main board for ~$30 but I think it's all surface mount replacements and I'm not really wanting to try surface mount soldering. There is also a $30 EEPROM chip replacement, but same deal with the soldering, and I don't think that will fix what appears to be a dead main board. I don't really have any extra parts or major equipment to do any further diagnostic with, only a DMM. Thanks in advance for the help.
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