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Moderated by: Robert

EurAsia : Index Classic consoles... SCPH-5502 doesn't load game discs
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Author SCPH-5502 doesn't load game discs
PCM



private

Registered: 2010-12-22
Messages: 10
Status: Offline
 _#35681 posted 2017-09-22 @ 11:10 GMT   
Greetings!

I've had the MM3 modchip based on PIC16F629 on this SCPH-5502 before, and it worked fine. However, I didn't like the installation (hot glue, long wires etc.), so I decided to reinstall it.
After the reinstallation it stopped booting any PS1 discs (original, import or backup) that worked just fine previously. All I get is "Insert PlayStation disc". At first, I thought that the laser is bad, and even ordered a new one, but this didn't help.

So, I thought that the issue could be in the chip itself since K150 programmer I used didn't work well with the OS. I ordered a preprogrammed one from this site's online shop.

In the meantime, I decided to remove the chip altogether and verify that the console boots anything at all. But it doesn't! Audio CDs work perfectly on both lasers, but game discs don't. I tried adjusting the pot on both lasers, but to no avail.

Here are the photos of PS1 board with and without the modchip:
https://imgur.com/a/kJJIx
The green board in the photos is the PSIO Switch Board, and PSIO itself works perfectly.

I don't see any issues with soldering, there are no damaged traces/points.
What could possibly prevent the console from booting game discs?

[ This message was edited by PCM on 2017-09-22 @ 14:11 GMT ]

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modrobert



donor

Registered: 2003-10-17
From: Bangkok
Messages: 6249
Status: Offline
 _#35682 posted 2017-09-22 @ 11:42 GMT   
Perhaps the games you test with are a different region? They loaded fine when you had the PIC12F629 because it removes region protection.
  _____________________________ ____________     __________________ /\________
  \    __________________      \      _____/____/     _    \       /_        /
 /     /       |       l/     _/    ____)     _/      _     \     \/  cREAM /
/______________l_______/       \______________\_______|      \_   /________/
 -+--Mo!-------------- \________/ ------------------- l_______/_____\ -----+-

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PCM



private

Registered: 2010-12-22
Messages: 10
Status: Offline
 _#35683 posted 2017-09-22 @ 11:59 GMT   
No, I'm sure the games are PAL. I tried SCES-02380 (GT2 Arcade Mode), SLES-01370 (Metal Gear Solid) and SLED-01735 (Silent Hill Demo), the PS1 recognizes none of them. MGS and SH Demo are in nearly perfect condition, so it's not a dirty disc issue, too.

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PCM



private

Registered: 2010-12-22
Messages: 10
Status: Offline
 _#35684 posted 2017-09-22 @ 15:40 GMT   
Problem solved!
I decided to take a look at the board one more time and try to check the traces that modchip uses.
And guess what? There's a cut trace between IC706 and IC304 that transfers the CG signal (point #6 on MM3 diagrams):
https://i.imgur.com/CcgwebE.jpg
Repaired it, and original discs boot fine!
I guess this was an unfortunate combination of dead modchip and terrible installer that worked on this PS1 before me.
The board had this abomination when I got the console:
https://i.imgur.com/wgSuvAY.jpg

Looking forward for the MM3 from this site!

[ This message was edited by PCM on 2017-09-22 @ 15:46 GMT ]

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