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DP42D23 TV will not power on, no power light or screen response

A few weeks ago my Sanyo DP42D23 failed while in use. While viewing Roku HDMI input, the screen suddenly displayed multicolored "noise" for a few seconds, then went black.

On this particular model, I didn't see any replaceable fuses on the power board. I got a very cheap replacement power board pulled from a working/cracked panel set, and still have no response. I have tried letting the device sit without power overnight, holding down power button for 2+ minutes, etc., without improvement.

The TV was connected to high-quality surge protectors at the time it stopped working and no other devices on the same power supply were affected. It was also connected to a coax antenna which was not surge protected, but there was no storm activity whatsoever at the time of failure, and the antenna is an attic-mounted Mohu unit that wouldn't easily come in contact with surge-level voltage. However, part of the coax cable does run outside above ground, so a coax surge is technically possible.

My next options are to replace the power cable, or replace the video board. The power board end of the molex-type power cable makes a "rattling" sound when shaken - this does not seem normal to me but I haven't seen any info on this. Because the coax is on the video board and it was the only non-surge protected input to the TV at the time of failure, I also wonder about replacing it.

I can get a new power cable for $10 and a video board for $20 if it would fix the issue, but don't want to dump more money into this TV if it's not fixable. I can solder and have built several PCs, so advanced suggestions are welcome.

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@jhermes131 check your power board for F601 which is a fuse. Check that one for continuity, TV powered off of course. After that you want to use your multimeter and check to see if you even get power to the board. No reason to replace a cord if you get power to the board. K601 are the power leads. If you do get power to the board then check K702 connector against the legend printed on the side of the connector. Those are DC voltages so make sure that you place your multimeter in the right mode.

Going by this "screen suddenly displayed multicolored "noise" for a few seconds" it could be an issue with the main board as well as the T-con board. Check the fuse on the T-con board (F1) and see if you have a. continuity and b. power to the T-con board. Always make sure that you check all your inputs and make sure that you do not have anything on any other input.

For any further clarification do not hesitate to ask and it may help if you post images of your boards with your question so we can see what you see. Use this guide Adding images to an existing question for that

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Before purchasing a power cable, check the back of the TV to see if any lights will come on (like coaxial red lights, etc...) if not, then you may want to get a new power supply. There is no way to be sure it is a PSU at fault or a screen issue.

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Jonathan will be eternally grateful.
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