Thanks for the responses. Although I think Ive been "off the tools" too long. It wasn't the diode, I forgot to unplug the logic board before testing !

So ignore what I said previously ! - This is what's happening........

The AUO 39T15 CO4 Ctrl Bd has virtually no voltages on it apart from the incoming 12v from the logic board. If I unplug the daughter board ( 39T15 SO 8 XL) then AVDD, VGH and VGL return to normal although VCOM is only showing 1.9V
Long shot I know but does anyone have a clue where to start !
Are there no schemas for these AUO boards...

Hoping someone has troden this path before !
I'm looking at a JVC LT-39c790 - a vestel based unit.
So, the remote turns it on, led's light up but no picture at all.

I have a spare mainboard, so I know its not that. The PSU seems ok too.
On the AUO T-Con I've got 16v on HAVDD_H but nothing on HAVDD_L - which I'm assuming should also be 16v ?

So, Ive resorted to testing eveything I can on the board as I can't find any schemas for it (AUO 39T15 C04 Ctrl Bd) and I think I've found a diode gone short. it marked D005 on the board and E1 on the package...

Re: New Members - please post your introductions here

hello

Re: New Members - please post your introductions here

Oh this is a bit scary !
I'm now retired and have rediscovered my love for being "on the tools" however everything has gone really really small ! I mean a resistor was a as big as a multivitamin tablet now its like a crumb off my cracker !
thats what 40 years does for you !
oh well, here goes ............