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Post by mouth78 on Apr 29, 2023 20:46:30 GMT
Hi everyone.
I bought a pc engine duo, the owner told me It worked, but It sounded low and then owner decided to do a recap. Owner desoldered all caps but never soldered new ones. He had a caps new kit and he gave me with console.
When I recibed the duo i disassembled it and i saw the board was clean but several pads, potentiometer sound and switch cd tray was disappeared. I found alternative pads, and soldered new caps and the potentiometer.
My problem is duo doesn't power on ...
I have fusible OK, Diode OK and the two regulators of tension send 5v. What is the next have i check?
I really like revive this console, I think is a nice model.
Any help is welcome.
(Sorry my bad English)
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Post by Lost Monkey on May 3, 2023 19:56:53 GMT
Hi everyone. I bought a pc engine duo, the owner told me It worked, but It sounded low and then owner decided to do a recap. Owner desoldered all caps but never soldered new ones. He had a caps new kit and he gave me with console. When I recibed the duo i disassembled it and i saw the board was clean but several pads, potentiometer sound and switch cd tray was disappeared. I found alternative pads, and soldered new caps and the potentiometer. My problem is duo doesn't power on ... I have fusible OK, Diode OK and the two regulators of tension send 5v. What is the next have i check? I really like revive this console, I think is a nice model. Any help is welcome. (Sorry my bad English) Are you trying to power it while hooked up to a TV? The led on the Duo is only a CD Access indicator - not a power light. (Just checking!)
Otherwise - you may want to go back and check all your caps to make sure they both soldered firmly and in the right polarity.
Also make a visual inspection of the board for potential continuity issues.
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Post by mouth78 on May 4, 2023 23:11:17 GMT
I did all you mention 😞 The fuse is ok, the diode is ok and the 2 regulators has about 5v out.
Im lost...
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Post by mouth78 on May 6, 2023 10:18:09 GMT
Any idea?
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Post by mouth78 on May 6, 2023 20:44:52 GMT
I have news. I use the 9V power supply. Today I connected earphones and I could ear sound of game...,😱. Sound was very low but I could ear Bomberman.
No signal in my TV...I use AV cable of duo-r. Is Duo-r cable compatible with duo?
Led don't light although I press run button...
I discover IC503 hadn't ground in pin 4, one of the little holes didn't comunÃcate upper track with lower track, so I soldered a cable to get ground in pin 4 of IC503. Now I get high sound with earphones but I can't get any signal in my tv still ...
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Post by mouth78 on May 7, 2023 11:39:28 GMT
More news:
Today I have used another TV and when I siwtch on the console TV shows a white imagen. If I put hucard game it works perfectly, image and sound perfect ,🤤...I suppose there is a problem with the ROM of system card 3. Where can I search the problem? What do you think about?
Regards.
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Post by Lost Monkey on May 8, 2023 19:35:05 GMT
Unfortunately - I have a Duo with similar issues - System Rom will not come up, but HuCards will play. Graphics are glitchy.
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Post by mouth78 on May 11, 2023 19:23:53 GMT
I have been measuring the tension in each capacitor. Do you see any strange? Thanks a lot... ibb.co/zhkxmr4Note: All values in V. I only switch on the console,without games. C884: 0.92V |
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keithcourage
Punkic Cyborg
https://www.facebook.com/turbografxfan/
Posts: 220
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Post by keithcourage on May 19, 2023 1:26:51 GMT
Lots of times it's a bad 7805 voltage regulator or bad/corroded via connections under the card slot connector.
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Post by mouth78 on May 19, 2023 22:31:13 GMT
Thanks, I first have to check the capacitors...
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