Kiowa LED39F3300-T-CON V390HJ1-PO1 failure

[yassinos]

Model: Kiowa LED39F3300

Motherboard: MS82S (40-MS82S0-MAD2XG)

Microprocessor: MST6E182VS-LF

Power Supply: 40-E371C4-PWG1XG (PE371C4)

T-CON: V390HJ1-XC01

This is my first participation and I apologize for the language as I am not very fluent in English.

Backlight + Sound (OK) but no picture (see pictures)

The measurements I made on the T-CON are as follows:

VGL=-7.98V / VGH=26.8V / VGHP=31.00V / VREF=17.00V / V12V=11.86V / VD33V=3.27V / V33V12=3.27V / VDD=3.27V /

S_PWRON=3.25V / PWR_ON=3.25V / XAO=3.26V / GVOFF=2.27V / V1V2=1.19V / POL=1.18V / VCM_CF=VCM_TFT=7.80V /

VAA=17.66V / CKV=1.82V / STV=0.01V / VCOMS=7.80V

But VAAM=0.11V (normally 9V) and HVAA_IN=0V (normally 9V)

I also found the series of capacitors CD4x (CD41-42...CD50) on both sides of the T-CON shorted.

I have doubts about the UH1 (marked 1577 =G1577_Operational Amplifier) because I find CH1 & CH5 shorted but when I remove RH1, the short disappears.

Please help me with a schematic of this T-CON or at least the source of the 2 voltages HVAA_IN & VAAM

Maybe it's the board that is defective?

[nomoresonys]

So do you have 1 ohm value on RH1 when removed? Does seem like UH1 is the problem. See if you can grab a datasheet for it.

[yassinos]

Dear nomoresonys !
Yes, I have 1 ohm value on RH1 when removed.
Thanks for your advice.
The UH1 (G1577) datasheet is incomplete. It's a low power operational amplifier.
I'm looking for the source of the two voltages, VAAM and HVAA.
The CM501 Shifter IC is OK.
My friendly greetings
https://www.mediafire.com/file/th0gv...G1577.pdf/file