Apex LD4688 No power or standby

[drjameshouse]

Hello,

A friend dropped off an apex ld4688 tv and said when they moved he hooked something up backwards (not sure what or how) and now the tv won't power on. If you plug it in there isn't a standby light. If you use the remote to turn power on or the button, no picture, no power light.

I did find this thread: http://www.videokarma.org/showthread...ht=apex+ld4688

I tried to follow it as best I could. I don't see any bubbled caps, and the fuse is still good on the PSU.

If I test the stanby pin going out of the PSU to the main it is 4.92V. If I jump the standby 5v pin, the 12V pins on the PSU all read 11.44V. Are these adequate readings?

With the pins jumped I tested the regulator U10 on the board and had 4.88V in and 2V out.

I should note that my friend couldn't find the power supply cord so I have tried various Computer PSU cords that are 10A 120V, and have had same results on everything.

I am happy to buy a new PSU, Main board, both, or just junk the tv and buy a new, but if I can get this one working for the least amount I would really be happy as a clam!

Thanks for any help. Here are links and numbers of the boards in the tv:
PSU: MLT198TX http://www.shopjimmy.com/megmeet-mlt...wer-supply.htm
Main: 1008H1666 http://tcoutlet.com/epages/b1a2da86-...51/Products/86

Service Manual: http://elektrotanya.com/apex_ld4688_.../download.html