49 Reply by powersupply

(16 replies, posted in Nintendo Handhelds)

Alright, so I can't figure out where I need to get a reading from... I found one on the stuff you linked but I don't know how to relate that one to the actual game boy. Could I get a picture pointing out where they are located? Sorry, a bit of a noob here ;p

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50 Reply by powersupply

(16 replies, posted in Nintendo Handhelds)

BennVenn wrote:

Your old analog multimeter will be fine, to measure negative voltages, just reverse the leads.

I think you have one dead line (which isnt being driven properly) and you still have the original fault.

I'd start with checking 5v and the -19v are OK. If you want to try fix this I'm happy to take voltage measurements on mine and post them up so you can compare. Do you have a soldering iron?

Okay, thanks, I'll try this right now and post back in a few minutes when I'm finished. And yep! I've got a soldering iron.

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51 Reply by powersupply

(16 replies, posted in Nintendo Handhelds)

Koji-Kendo wrote:

Usually gently scrubbing underneath the potentiometer wheel with a toothbrush, rubbing alcohol and then blowing it out with either compressed air or breath while spinning it does the trick for me.
Done this on gb colors and pockets as well.
Maybe give that a try. :-)

After doing this, it looks like the vertical blank line is actually the only one working, but barely. When I turn the contrast wheel it consistently changes color for about 90 seconds after the system is powered on.

Wheel at minimum:

Wheel at maximum:

(You can see that it's actually darker than the rest of the screen)

Wheel at maximum after about 90 seconds:

(You can't see it in the picture, but the line is filled with randomly shaded pixels.

BennVenn wrote:

Koji-Kendo has likely pointed out the problem, but if the problem still persists...

If you have a multimeter, check the LCD bias voltage is present and correct on the LCD board. -19v I think it was. Could be a bad power supply board.

Also you can check the individual pixel shade voltages at the IC labeled IR3E02, as well as gnd supply and 5v to that chip.

It could be anywhere from the CPU right up the the LCD, do you have a second GB to swap out the LCD board/Power supply with?

Reference http://www.freeinfosociety.com/electron … hp?id=1449

I don't really have experience with multimeters, and the one I have is old fashioned (needle that moves, not digital with exact numbers), and seems to only go in the positive direction.

I did try it on a working bottom PCB, and the screen acted the same way as before.

Any ideas on this? Or is this game boy's final resting place the parts box?

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52 Topic by powersupply

(16 replies, posted in Nintendo Handhelds)

I'm a little new to game boy modding, so I figured I'd buy some DMGs off of ebay and fix them up. First one of three I got had corroded battery contacts, no big deal. After getting that cleaned up It powered on but the screen only shows this:

I'm not referring to the vertical line, but to the fact that the screen will literally show only this. The contrast wheel barely does anything. Sometimes it will change stuff inside the vertical line, but that is rare, and the rest is unaffected. I believe it is playing games fine because game music comes headphones.

Also I'm pretty sure the problem is only with the front PCB, because I swapped the front PCB out with another one of the game boys I had and everything worked as expected. Any Ideas on how to fix this?

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53 Reply by powersupply

(4 replies, posted in Releases)

Thanks everyone! big_smile

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54 Topic by powersupply

(4 replies, posted in Releases)

Today I released my very first album, have a listen!
https://powersupply1.bandcamp.com/album/ecstatic

Constructive criticism very welcome! Enjoy.

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55 Reply by powersupply

(3 replies, posted in Nintendo Handhelds)

Sure. G03371410
Dmg-cpu-02

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56 Topic by powersupply

(3 replies, posted in Nintendo Handhelds)

My gameboy doesn't like playing drum kits on the wav channel with any other channel. When it does, it plays a high pitched buzz along with the drum sound. Here's an example. Starts around ten seconds in.

https://soundcloud.com/powersupply-1/weird-buzzing
(Track isn't mine, it's the J Arthur Keenes Band song Water2(Wetter) being played on my gameboy.)

It sounds like this from my prosound 1/8" jack, the stock headphone jack, and the gameboy speaker. When playing only the wav channel it does not happen on headphones, but the gameboy speaker still plays it. This has happened on two separate DMGs, but not on a color. Also doesn't happen in an emulator. Could something be wrong with my cartridge? (using an EMS smart card.)

Can this be fixed? Is it normal?

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