Sorry to post in this old thread. The board scan image is awesome!
I have a Hong Kong version PS2 SCPH-90006, and the layout is different from this one. I attached the photo of my board in the end.
I just want to ask a very stupid question. I accidentally wired 15V power into my PS2 90k, and I think some part of it is broken because the LED doesn't turn on.
I tested the voltage based on this board scan. Even though my PS2's board is different, I think it follows a similar logic.
I found that the input voltage is 7.5V going into an 8-pin chip, which delivers different voltages to the board (5V / 3.5V / 2.5V). I marked this part from the scan — it's this section:
View attachment 37915
But on my fried board, the output of this chip is all zero. The input is 7.5V, but the rest of the board reads zero everywhere.
I assume this chip is dead, but I couldn’t find an exact match because the marking isn’t very clear. It seems to be:
4830A
AF (with a triangle symbol)
L78K
View attachment 37914
From the discord channel,@jameshehfefld kindly tole me this is 'Vishay SI4830ADY' (Thanks a lot!)
Then I found another picture — in fact in the scanned GH-072-42 version, it's a different component:
2218
0C2
6100
View attachment 37918
I'm not very good at reading PCB layouts, so now I'm not even sure if I actually found the faulty part.
On my board (GH-070-42), I can’t even find the square chip that I
think is supposed to be the controller for the MOSFET — if that’s what it is?
Any thoughts? Thanks in advance!!
My boards:
View attachment 37916View attachment 37917