Hey so i bought this used psx and the chip wiring is wierd

[edisnord]

It's a SCPH9002, i bought it used and the chip doesn't seem to work as burned games stopp spinning when put in the console and the console redirects to the Memory Card/CD Player selection menu, here's a pic of the chip, one of the wired seems to be removed and i don't know where to solder it on the chip.

[leafy]

Use a loupe or take a photo of the top of the chip under good lighting?

The question really is, did the original installer wire it correctly?

I can tell you what some of the points on the board are.

From left to right; +5 volts, GATE_WFCK, the 3rd should be DATA, but I think they got it slightly off, last is a GROUND point.

So, you need to know which pin on your chip takes the GATE_WFCK, and move the DATA over if is wrong.

PIN 6 is to GROUND? That seems wrong on any chip.

It could be a mis-wired 4-wire chip. I think you need to put the wire that is on pin 6, and put it on 8. Then put the DATA to pin 6. Move the wire on the board from where it is to #6 in the pic below. Also attach that free wire to PIN 5.

If it was an old PIC in a 4-wire REI configuration, say a PIC12C508, you would see this:

PIN - function
1. - Vdd (+5Volts DC)
5. GATE/WFCK
6. Data output to send the correct copy protection serial message so the console accepts the disc.
8. Ground

Code: Select all

;       Chip is connected in 4-wire fashion:
;
;                       _______  _______
;                      |       \/       |
;                Vdd --+ 1 <<      >> 8 +-- Vss
;                      |                |
;           GP5/OSC1 --+ 2 <*         7 +-- GP0
;                      |                |
;           GP4/OSC2 --+ 3         >> 6 +-- GP1
;                      |                |
;          GP3/!MCLR --+ 4 <#      >> 5 +-- GP2/T0CKI
;                      |                |
;                      +----------------+
;
;       4-wire: ">>" and "<<" indicated pins are connected.

DATA is number 6 -