Sony XBR-55X810C GN1T Chassis dead in the water, no white or flashing LED

[Yanleb]

Hi, I have this Sony XBR-55X810C that was working when it was last used. It has been stored with the power cord disconnected for two years. Now, reconnecting the power cord it shows nothing. No white power LED, no flashing LED. It is dead in the water.

On the power supply, the STBY3.3V standby voltage is OK. The POWER_ON has 3.4V and the power supply turns on, supplying 12V to the main board. This is pretty strange.

On the 1-894-595-12 (A2072598B) main board, I did follow the troubleshooting section 3-2-2. NO POWER-U-Com Failure for no power, and the only abnormality is #pin18 at the very end of the flow chart that has 0V. But it says to check this first: If BL_MUTE (R9174) is 0V...

So, I understand that BL_MUTE must be 0V. The board view is in very low resolution, so this is hard to know which resistor is R9174. I did include a high-resolution picture of Ucom IC9017 (which is a PIC16F527), and the surrounding components. Are you able to tell me which resistor is R9174? Also, do you know what to check if R9174 is not 0V?

If R9174 is effectively 0V and #pin18 is 0V, it says to replace IC9017. Yeah, where do I find a programmed IC9017 now?

To give me better chances of getting a response, here are the boards/TV sets that share the same GN1T Chassis:

Boards:
189459511 / 1-894-595-11
189459512 / 1-894-595-12
A2072545A / A-2072-545-A
A2072546A / A-2072-546-A
A2072555C / A-2072-555-C
A2072588A / A-2072-588-A
A2072588B / A-2072-588-B
A2072598A / A-2072-598-A
A2072598B / A-2072-598-B
A2123800A / A-2123-800-A
T20170010 / T-2017-001-0

TV sets:
XBR-43X830C
XBR-49X800C
XBR-49X830C
XBR-49X835C
XBR-49X837C
XBR-49X839C
XBR-55X805C
XBR-55X807C
XBR-55X809C
XBR-55X810C
XBR-55X900C
XBR-55X905C
XBR-55X907C
XBR-65X800C
XBR-65X805C
XBR-65X807C
XBR-65X809C
XBR-65X810C
XBR-65X900C
XBR-65X905C
XBR-65X907C
XBR-75X910C

[William1967]

I suspect a problem with the EMMC; this part wears out after a few years of use. Replacement is possible, but then you'll miss Netflix. This can be solved with a media player or something similar.
Almost all models with this motherboard have this problem, I have saved dozens of them this way.

[Diah]

2 years you may forget what the issue was or who have it stored.. front LED could be tun off by user setting since its Android TV. 12V you have, power on too.. did you watched the audio Optic port if it lit red ?