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NEC TG-16/TE/TurboDuo => TG-16/TE/TurboDuo Discussion => Topic started by: wilykat on July 30, 2015, 03:44:43 PM

Title: Do I have a bad disc?
Post by: wilykat on July 30, 2015, 03:44:43 PM

On Duo-R I tried to play Might and Magic III and the graphic seems off to me.

(http://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 July 30, 2015, 04:37:02 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 July 30, 2015, 05:16:46 PM

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 July 30, 2015, 08:01:27 PM

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 July 30, 2015, 09:59:53 PM

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 July 31, 2015, 12:03:21 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: Necromancer on July 31, 2015, 02:25:07 AM

Quote from: wilykat on July 30, 2015, 03:44:43 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 July 31, 2015, 11:15:34 AM

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 July 31, 2015, 02:45:09 PM

I made new thread in repair section since it's hardware issue, not game issue: http://www.pcenginefx.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.