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NEC PC Engine/TurboGrafx-16 Games/Consoles => PCE/TG-16|CD/SGX Discussion => Topic started by: wilykat on 07/30/2015, 10:44 PM

Title: Do I have a bad disc?
Post by: wilykat on 07/30/2015, 10:44 PM
On Duo-R I tried to play Might and Magic III and the graphic seems off to me.

(https://i.imgur.com/5oZ4OuC.jpg)

Is that how it's supposed to look?  The animated part and the text seems fine but the static part seems funny.  My Duo-R doesn't show any glitches when I played Space Fantasy Zone, Dungeon Explorer 2, and other games.  I'll do Populous next, I got a few more CD games to check.  Space Fantasy Zone and M&M3 are the only ones I have on CD-R.

If it is bad game,  [snipped]
Title: Re: Do I have a bad disc?
Post by: thesteve on 07/30/2015, 11:37 PM
try YS3
let the intro run through and look for grafx glitches
Title: Re: Do I have a bad disc?
Post by: wilykat on 07/31/2015, 12:16 AM
I have the legit US Ys III and part way through the intro the screen turned black with lots of colored squares. I was able to skip the rest of intro and got start/continue screen looking normal.

Maybe a bad chip?  I'll record the scene and make a new thread in repair section.
Title: Re: Do I have a bad disc?
Post by: thesteve on 07/31/2015, 03:01 AM
sounds like you have bad data on the PCM ram
could be trace or chip
Title: Re: Do I have a bad disc?
Post by: wilykat on 07/31/2015, 04:59 AM
So which one is the RAM chip?  The service manual only covered TG-16 and nothing about any of Duo.
Title: Re: Do I have a bad disc?
Post by: thesteve on 07/31/2015, 07:03 AM
your PCM RAM are the 2 chips just left of the cd mech with the legs curled under them (near the supercap)
seen bad traces to them a few times and failed chips once
Title: Re: Do I have a bad disc?
Post by: Nazi NecroPhile on 07/31/2015, 09:25 AM
Quote from: wilykat on 07/30/2015, 10:44 PM... where can I find a clean download? 
Use google.  Asking openly for ISOs and ROMs is a bannable offense.
Title: Re: Do I have a bad disc?
Post by: thesteve on 07/31/2015, 06:15 PM
duo-r board IC509 and IC510 center of board, topside
look for corrosion near the chips
Title: Re: Do I have a bad disc?
Post by: wilykat on 07/31/2015, 09:45 PM
I made new thread in repair section since it's hardware issue, not game issue: https://www.pcengine-fx.com/forums/index.php?topic=19474.0 (https://www.pcengine-fx.com/forums/index.php?topic=19474.0) I've posted a very good closeup of the board with the 2 ram chips.  No visible corrison on top around the chip.  So it's either hidden bad trace, bad vias, or bad solder joint.