Sony XBR-55X900F EMMC Repair

[Konner]

Hello, I picked up a free broken Sony XBR-55X900F. Motherboard number 1-983-249-31. I figured it would be a fun project to fix. When I plugged this TV in it was completely dead and had no power light. I followed this guide to help me diagnose the problem https://www.youtube.com/watch?v=4afrEbS5mZw. I have quite a bit of experience fixing other electronics, but not much with repairing TVs. I initially thought it was going to be a dead power supply, however after quite a bit of digging I suspect that the emmc is likely corrupted. I had 1.8v and 3.3v going to the emmc. With the motherboard removed I supplied 3.3v to the power_on, bl_on, and tcon_on and got the pattern test screen where it flashed through the different solid colors. I decided to pull the emmc off the board to read it. I don't have much experience with reading and flashing emmc. However the emmc seems to be healthy at 10%-20% device life time used. I've tried looking for another emmc dump for this TV and and was unsuccessful. Does anyone else have a dump for this emmc, how do I know what part of the firmware is corrupted, and what do I have to flash to fix it?

This is the emmc dump from my board https://****************/file/d/1XMI...ew?usp=sharing

[kevin_allein]

Hi, may I come back to your test showing the LCD test screen ?
You write, that you only supplied 3.3v to the power_on, bl_on, and tcon_on pin. But those are all pins of the power supply connector - correct ? Did you not have to apply some signal to the TCON itself to get the pattern test screen where it flashes through the different solid colors ?

[hallc386]

Hello, I picked up a free broken Sony XBR-55X900F. Motherboard number 1-983-249-31. I figured it would be a fun project to fix. When I plugged this TV in it was completely dead and had no power light. I followed this guide to help me diagnose the problem https://www.youtube.com/watch?v=4afrEbS5mZw. I have quite a bit of experience fixing other electronics, but not much with repairing TVs. I initially thought it was going to be a dead power supply, however after quite a bit of digging I suspect that the emmc is likely corrupted. I had 1.8v and 3.3v going to the emmc. With the motherboard removed I supplied 3.3v to the power_on, bl_on, and tcon_on and got the pattern test screen where it flashed through the different solid colors. I decided to pull the emmc off the board to read it. I don't have much experience with reading and flashing emmc. However the emmc seems to be healthy at 10%-20% device life time used. I've tried looking for another emmc dump for this TV and and was unsuccessful. Does anyone else have a dump for this emmc, how do I know what part of the firmware is corrupted, and what do I have to flash to fix it?

This is the emmc dump from my board https://****************/file/d/1XMI...ew?usp=sharing

Can you share us the dump? thanks in advice.