Weird AV issue after install (PU-18)

barth0lin0 commented 3 years ago

Hey! i'm having an issue with a PU-18 install. I'm not certain if it's a Xsation issue or simply a console issue.

Installed the kit without any difficulty on a a customer's console ( the console came without the CD drive so unfortunately I could not test it before the install...) Edit: client confirms the console was working before install, removed the cd drive before sending it.

after the install, Xstation booted a first time. Then the video signal dropped. Rebooted the console: black screen. After i while, rebooted, got a video signal with a distorted playstation logo and startup sound. Then the black screen returned. I can sometime boot to Bios after the distortion happens. I had luck once or twice booting to the Xstation and playing a game for a few minutes before the distortion and black screen. Tried connecting on the console my OSSC: resolution changes constantly, rare sync for a second or two and then Sync drops : no signal. Blue power light and green acces lights seems to work correctly.

What i did yet to troubleshoot the console/install:

-tried 2 different SD cards -Redid all the QBS soldering -checked continuity of each point on the MOBO and also the continuity of each pins of the ribbon cable connector on both QSB and Xstation PCB. -Ribbon cable is ok -Checked for shorts between each points -Swapped the power supply -composite cable and RGB scart cable -tried removing the botton metal plate in case of short -Reflowed the pins next to the lifted one and tested continuity/shorts -No lifted pins are touching each other or the chip's other pins. -Cleaned the QSB and IC701 with 99% IPA. dried with blower. -Tried booting the console while pressing on the different IC of the mobo in case of a bad contact. No luck

Only thing i didnt tried yet is removing the QSB and check for shorts under it.... i doubt it would be the case....

So ? Bad install ? Bad console? Bad luck ?

any advice is welcome !!! Thx

barth0lin0 commented 3 years ago

If it can help : the PS1 never boots when the Xstation is disconected. No booting to bios. I don't know if it normal or not!

ramapcsx2 commented 3 years ago

Well, it sounds like either the APLL clock source for the CPU is failing (this is an xStation + APLL wire thing), or the GPU is failing (this is a chip damage / snapped solder joint on the GPU thing).

In any case, this doesn't sound like I could debug this remotely. You'll have to try and figure out which part of the console is failing, narrow it in a little.

barth0lin0 commented 3 years ago

Well, it sounds like either the APLL clock source for the CPU is failing (this is an xStation + APLL wire thing), or the GPU is failing (this is a chip damage / snapped solder joint on the GPU thing).

Is there other solder point related to the APLL clock source ? I will resolder another wire to test it. i had continuity between both point...resistor is removed.

ramapcsx2 commented 3 years ago

No, it's a pretty simple thing and in your pics, I can see it's fine.

barth0lin0 commented 3 years ago

Removed completely the QSB, redid all the soldering, same issue Reflowed IC701: same issue. PS1 is dead! i wont invest more time with it. Let's hope the QSB will survive a second desoldering ... thx

ramapcsx2 commented 3 years ago

IC202, IC203, that kind of area is what I would expect for the error description. But you're right, better replace it at this point.

L10N37 commented 2 years ago

If you're anything like me you get a bit cocky after doing so many of these, once that happens you make mistakes. Installed one yesterday as a customer came and picked up from my house. Did another tonight, issues like this. Bridge on IC310.