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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: 231
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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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Post by mouth78 on Mar 11, 2024 20:34:26 GMT
I am here again. Finaly i found a very,very small track Broken and repaired It. Duo start whith system card 3 and hu card works ok. But CD doesnt spin... When I use CD, len cames to the center, go up and go down 4 times and stop...I can see red laser into the len if I dont use a CDrom.
What can I do?
Note: Motor is ok, if I conect 3V to the motor, motor spins.
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keithcourage
Punkic Cyborg
https://www.facebook.com/turbografxfan/
Posts: 231
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Post by keithcourage on Mar 13, 2024 10:31:58 GMT
The lens moving to the center and moving up and down is good, but the disc should then spin up. Have you tested another lens after you repaired the bad trace?
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Post by mouth78 on Mar 13, 2024 21:33:50 GMT
Seller told me it worked before "unsolder" the caps...
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