Why is my C38 Capacitor not working? (Pocket-Color Conversion)

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Game Boy Color

任天堂 Game Boy的彩色版本，发布于1998年。维修Game Boy Color十分容易。

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Rikka Lee @itsrikka

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发帖于: 2022年9月28日

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Why is my C38 Capacitor not working? (Pocket-Color Conversion)

I’ve built a few Pocket-Colors with success. However, I haven’t had audio in the last two I’ve built. It seems to be down to the C38 capacitor. It only reads 0.008V when powered on.

A Pocket-Color conversion requires trimming the bottom portion of the motherboard and makes use of jumper wires to fix the issues of not having a Headphone jack or DC Input.

I’ve went back through the original systems I built, found no discrepancy. I checked the tutorials I originally watched and verified I’ve done everything correctly.

I swapped the C38 from a known working system into a faulty system to no avail. However, now the originally good system is experiencing the same issue. Replacing the capacitors has not proven fruitful.

If anyone could help me with this, I would greatly appreciate it.

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@itsrikka are you swapping the same capacitor over to the different boards? Have you used a new capacitor or at least checked the one you are swapping?

由 oldturkey03 完成的 2022年9月28日

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For the first test, I did use the same capacitor but since then I’ve gotten a pack of 50 to test with. So far, none have worked. I’m about 8 in.

由 Rikka Lee 完成的 2022年9月28日

@itsrikka okay good. Had me worried there for a minute ;-). Let's see if we can find out what might be going on with that circuitry.

由 oldturkey03 完成的 2022年9月28日

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@itsrikka are you swapping the same capacitor over to the different boards? Have you used a new capacitor or at least checked the one you are swapping? — oldturkey03
@oldturkey03

For the first test, I did use the same capacitor but since then I’ve gotten a pack of 50 to test with. So far, none have worked. I’m about 8 in. — Rikka Lee
@itsrikka okay good. Had me worried there for a minute ;-). Let's see if we can find out what might be going on with that circuitry. — oldturkey03

jayeff @jayeff 声誉积分: 450.9千 11 367 1.4千 · Answer 1 · 2022-09-29T00:14:34-07:00

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jayeff @jayeff

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发帖于: 2022年9月29日

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Hi @itsrikka

Don't know about the pocket colour conversion but looking at the schematic for the Game Boy Colour audio section, "IF" the C38 capacitor is used for the same purpose as in the image below what voltage is seen on the speaker terminals?

(click on image to enlarge).

Also don't forget that audio is essentially an AC signal (really it is fluctuating DC so essentially it is like AC i.e. it has +ve and -ve "going" voltages), not straight DC per se, so make sure that there is an earth on one side of the capacitor as the audio current needs to flow through the capacitor to earth for the speaker to work. DC current will not flow through a capacitor but the AC audio component will.

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Game Boy Color

Why is my C38 Capacitor not working? (Pocket-Color Conversion)

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