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So I made my own custom soundtrack for Double Dragon II that swaps out the stage music. Mostly works fine, but by the time you reach the final stages the cutscenes don't quite sync up. Not terribly off, but enough to be annoying. Double checked the original and it plays fine (using disc rips via Mednafen). Any ideas? Best I can figure is the originals tracks are a hair longer if you zoom all the way in, but I don't know of any program more precise (I have both Audacity and Sound Forge). Thanks -Josh
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TG/PCE Repair/Mod Discussion / Re: Turbo Express Brightness wheel issue?
« Last post by Keith Courage on May 24, 2024, 07:23:41 AM »
Excellent! Glad you found something that works and thank you for the Link. I'm gonna order a few just in case.

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TG/PCE Repair/Mod Discussion / Re: Turbo Express Brightness wheel issue?
« Last post by dongzo36 on May 24, 2024, 01:38:46 AM »
Just a heads up for anyone looking for a brightness dials. I got my order from ali express and these
dials work and are the exact same size. Unfortunately they have numbers on them but I was able to lightly
sand them of and repaint the dial to match. Link below.  I hope this helps anyone looking for replacements

https://a.aliexpress.com/_mKJd4ow
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After trying various things for a while.

When the RUN button is pressed to start the CD, a voltage change was observed on pins 3 and 4 of the (P3) where the CD drive's green connector is connected.
This voltage change seems to start the CD drive spinning.

I perform a reset operation with the controller on another normal unit, the voltage returns to the voltage before the CD drive starts to rotate. This causes the CD to stop rotating.
However, on my unit with the problem, there is no change in voltage on reset and the CD continues to rotate.

(I followed the trace (P3) and reached the BA chip and the 4558 op-amp in IC107, so I tried replacing both of them, but the CD still does not stop.

It seems that the reset signal from the controller is recognised somewhere, which controls the voltage of the BA chip and op-amps, but I have no idea where that is. Does anyone have any ideas?
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Looks like a broken ROM. I don't think there's anything left you can do.
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TG/PCE Repair/Mod Discussion / Re: PCE Duo - No Sound (Post Recap)
« Last post by xodaraP on May 17, 2024, 10:03:00 PM »
This one is now solved! :D

Thank you very much Keith Courage, very happy to finally have this fully working after a lot of hours put into it

For reference it wasn't the voltage dividing resistors or capacitor in my case. It was R324 on the bottom of the board. I have beeped it out 100x before but I noticed today that the via had light going through it, but it wasn't completely clear. I cleaned it out, and no longer had a connection to ground. I think it was just barely holding on so the multimeter registered it, but it wasn't an effective ground for the system itself.

I looked up R324 and found this post from Keith on another PCE Fans thread and it described the issue I was having exactly


I just had to fix this problem on a DUO. There was a shorted via at R324. This area can be seen from underneath the board near the AV jack op amp. I was getting 7V on most of the 4558 op amp pins as well as the 10UF caps. Hope this helps.


Patched the via for R324 and immediately had 3.7v on the op amp and sound was coming through loud and clear on both HuCard and CD
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TG/PCE Repair/Mod Discussion / Re: PCE Duo - No Sound (Post Recap)
« Last post by Keith Courage on May 15, 2024, 11:05:29 PM »
There are resistors on the board that are supposed to cut down the voltage from 7 to 3.8.

One common spot for these resistors to fail or get old capacitor leakage under them which causes shorts, is right above the 22 microfarad capacitor that's next to the 5205 Oki chip.

Another common spot is just underneath the board of the 4558 op amp near the AV jack. the 22 microfarad capacitor right next to the 4558 op-amp that is near the AV jack should also read 3.8 volts on the positive side.
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TG/PCE Repair/Mod Discussion / Re: PCE Duo - No Sound (Post Recap)
« Last post by xodaraP on May 15, 2024, 03:44:26 AM »
I have double checked the ground to multiple other ground pins on the board and to the metal shield where the power supply ground is soldered on

I?ll see what else is on the rail for pins 3 and 5 since they are matching the Vcc voltage - could be they are shorted to the power line?
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TG/PCE Repair/Mod Discussion / Re: PCE Duo - No Sound (Post Recap)
« Last post by Keith Courage on May 15, 2024, 01:34:54 AM »
Sorry, I completely forgot about 7V on one of the op amp pins as it's extremely rare for the 7V rail to have any issues. So that is correct for pin 8

based on this diagram. Make sure that both pin 3 and 5 have 3.8V. Also make sure that pin 4 is a good ground. Check this for all op amps behind the Heat sinks. There are three 4558 op amps in this area. 

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TG/PCE Repair/Mod Discussion / Re: Turbo Express Brightness wheel issue?
« Last post by dongzo36 on May 14, 2024, 11:15:12 PM »
Ok so when I came home today I desoldered the brightness dial from a parts game gear board and soldered it to my TE and boom my screen works perfect now. So now I know the original brightness dial on my TE was faulty. I actually took it apart and the carbon trace that the dial runs on is almost gone.  I happen to possibly find a replacemnet on Ali express that is a 4pin and has the same wheel diameter, so I ordered it and will test it when it arrives and I will post the results when I get it.   Thank you again @Keith Courage for all the assistance.
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