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NEC PC Engine/TurboGrafx-16 Games/Consoles => Console Repair/Mod Center => Topic started by: Nunhunter on 11/28/2018, 12:17 AM

Title: Turbo duo sound issue. Capacitors changed op amps are fine.
Post by: Nunhunter on 11/28/2018, 12:17 AM
If anyone can help out I would appreciate it. At q603 and q604 atm. What's the voltage suppose to be at. It's bouncing 5-11v. Guessing corrosion short or open trace maybe damaged via.
Title: Re: Turbo duo sound issue. Capacitors changed op amps are fine.
Post by: Keith Courage on 11/28/2018, 07:23 AM
It's normal for q603 to fluctuate a Little. Starts around 0.11v here then drops to about 0.06 steady.

Q604 seems be steady around 0.20
Title: Re: Turbo duo sound issue. Capacitors changed op amps are fine.
Post by: NightWolve on 12/03/2018, 09:15 PM
Funny enough, I passed this along to thesteve, but Nunhunter already knew him on Facebook and he was already trying to help, heh.
Title: Re: Turbo duo sound issue. Capacitors changed op amps are fine.
Post by: Nunhunter on 12/04/2018, 02:02 PM
Yeah Q604 and Q603 are both fluctuating at around the same voltage. between .10v -.16v i measure the bottom left and bottom right legs. nothing constant. is that normal?
Title: Re: Turbo duo sound issue. Capacitors changed op amps are fine.
Post by: Nunhunter on 12/04/2018, 04:06 PM
The Steve helped me out. turned out to be corrosion on c322 to amp 503 and ground.
Title: Re: Turbo duo sound issue. Capacitors changed op amps are fine.
Post by: NightWolve on 12/04/2018, 10:30 PM
Quote from: Nunhunter on 12/04/2018, 04:06 PMThe Steve helped me out. turned out to be corrosion on c322 to amp 503 and ground.
(https://i.postimg.cc/mDVRB8Wx/facebook-like-thumb.jpg)

Cool, he's still got it! :)

It's good to have these cases documented somewhere for others to search for in the future.

I'm torn between DIY or just sending it to a pro and not wasting my time biting off more than I can chew; you have to recognize your limitations and not go too far. I still have a full capacitor replacement job to perform on my Turbo Duo, and I'm worried if something like these kinds of issues happens before that.