This device has logicboard# 820-01827. I couldn't find a schematic and bv for that one, so I am using a similar one, the 820-01041 which seems identical actually. Anyway I'm stuck on my troubleshooting, so let me take you through where I've been and where I am now and hopefully I can get some guidance. Initially the device was stuck on 5v.
I found C6503 shorted which is PPBUS_G3H. I injected 1v to reveal U7660 heating up. I replaced U7660 and that short/problem went away. (see images c6503, u7660).
After this I was getting 20v, but still no power draw/power on. I discovered that I found that C6456 was shorted to ground. I removed that, and that short is now gone, but still no current draw and no power on.(see image bc1)
I have checked power at R5600 and R5620 and have reported voltages in image bc2.
Please advise from here. Thanks!
I found C6503 shorted which is PPBUS_G3H. I injected 1v to reveal U7660 heating up. I replaced U7660 and that short/problem went away. (see images c6503, u7660).
After this I was getting 20v, but still no power draw/power on. I discovered that I found that C6456 was shorted to ground. I removed that, and that short is now gone, but still no current draw and no power on.(see image bc1)
I have checked power at R5600 and R5620 and have reported voltages in image bc2.
Please advise from here. Thanks!
Attached Files
