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Sony XBR-65X810C TV won't turn on after replacing mainboard
I have a Sony XBR-65X810C 65" TV that was initially stuck in a boot loop. Initially the TV was shutting on and off randomly and not displaying video from our dvd player but was playing sound. Then it got stuck into a boot loop so whenever the TV was plugged in, it would turn itself on, show the android booting animation, then crash and restart the process. Last week I took it into a TV repair store and I was told I needed to replace the main board. I decided to do the repair myself since I have a basic understanding of electronics repair and didn't want to pay several hundred dollars for the repair. I ordered a replacement mainboard (model number A-2072-555-C) from a 3rd party website. After installing it the TV will no longer turn on at all. Even the bottom white bar that lights up won't light up. I tested the 3V standby pin leading to the mainboard, and it was 3.4V so I'm not sure what my issue is. Any ideas on what I can do to fix this, or do I need to replace the powerboard as well?
ANSWERS:
"Hi,
Here’s some images taken from the service manual for the TV showing the No Power troubleshooting flowcharts.
(click on images to enlarge for better viewing)
Hopefully this is a start"
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