Xbox 360 S Failed RGH3 Repair

[cstout]

Hello all,

I've just had my first ever run in with a mod failure. Really bummed about it, but hoping to learn more from it. It started as a means for soldering practice and ended with me wondering if it could be restored to function or if something were shorted and now dead.

This is an Xbox 360 S and the board sticker reads: X865009-001 Rev. D. It's a CORONA V4 (4GB nand, samsung ram).

When I apply power and press the power button, there is no fan movement or lights and all I get is the power-on beep. If I press the eject button I get the different eject sound beep but still, no fan movement and no lights at all. The power supply has been tested good and prior to the RGH3 mod attempt, this bad boy booted right up and worked great. 😅

I'm really not sure where to start on this one, especially since I don't have any light codes to track down a specific failure.

Any help is greatly appreciated. This one's been bugging me to figure it out.

[cstout]

Here are some things I've checked so far:

• R4D3-R4D8 resistors all check out
• No bent pins in any USB ports
• No visible damage to wireless module/power button board

[cstout]

Edit: Also, all soldered wires have been removed. Back to stock.

[stj]

start with what you know - the fans, follow the power and ground back to whatever fet or transistor is switching them.
then see if you have 12v still