Power but no startup sequence

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Game Boy

The Game Boy released on April 21, 1989 in Japan, followed by North America on July 31, 1989, and lastly in Europe on September 28, 1990. It is characterized by a large grey casing and model number DMG-01.

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Steven Hodgson

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发帖于: 2013年02月27日

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Power but no startup sequence

I recently dug out my old gameboy, but despite supplying power, I do not get the logo block or sound when turned on. the led is red, though that just proves the led works.

I've tried with and without a cartridge, and with an 6V AC Adaptor, as well as four AA batteries that are fully charged.

I've checked for leaked capacitors, or acid damage from leaking batteries, but it looks like i've been lucky and there is no visible damage.

I've measured the voltage on the contrast, and I get a range of about 0.05 to 10V on the pot.

I couldn't find a voltage differential on the audio pot however. should there be one there yet if a startup hasn't occurred?

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oldturkey03 @oldturkey03 声誉积分: 624.1千 634 632 2千 · Answer 1 · 2013-02-27T22:24:37-07:00

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oldturkey03 @oldturkey03

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Steven Hodgson, could be a bit like looking for the proverbial needle in a haystack:-) I attached the power schematic for the GB and may be this will help you out. Check the caps on the DC-DC board. Hope this helps, good luck.

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thanks for replying oldturkey03. using the schematic i've checked, and the power is coming out at roughly those values. i checked the oscillator this morning and still running 4.19 MHz too.

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Game Boy

Power but no startup sequence

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