Galaga Monitor Repair

jgeiger

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Hi,

Trying to diagnose my buddies Galaga issues. The game plays blind and the monitor has a single line of colors right in the middle of it. Attached are some pictures. Also, I couldnt identify the monitor. Any help on this would be really appreciated.

Thanks.
 

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I'm going to guess it's a K4600. These have daughter cards mounted perpendicular to a motherboard (chassis). If this is the case, the pins that connect the daughter cards to the chassis are known for solder cracking. I would inspect the pins for solder crack. From time to time I've been able to troubleshoot this problem by slightly (and carefully) moving the cards or "thumping" the monitor. If the problem changes, you definitely have a loose connection somewhere.
 
Is that a WG 4600? I had the sane thing happen to my Galaga. I ended up replacing it with a new happ vision pro.

yes, it is

sadly vision pros are no longer made or readily available

Is that a G07 in that?

Nope, it is a 4600.

Either rebuild the X/Y daughter card or replace it. The X/Y daughter card is the one on the right when looking at the chassis from the back. It is also the one with the knobs (pots) on it.
 
Thanks guys. Its a WG19K4500. I pulled the chasis our the other day and will look at the Hor/Vert daughter card. Just doing a visual inspection it doesnt look like there are any cracked solder joints but I will get the magnifying glass out and look a little more carefully.

I figure Ill cap it while its out. While I am at it are there any other parts I should order to help fix the main problem? Would the vertical IC need to be replaced potentially?

Thanks again.
 
4500. Interesting. I've looked at the schems for a 4500 once, but I didn't take the time to compare and contrast with the 4600.

There is no vertical IC in a 4600, and I assume a 4500 too. It was before vert ICs were used. They made an oscillator and amplifier the old-fashioned way. And they liked it. Uphill. Both ways.

Good Mr. Fromm (on a 4600) suggests checking TR305 & TR306 (aka X305 & 306) first in the case of vertical collapse. Those are, of course, on the horiz/vert board.
 
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The solder issues for that will be on the pins that the daughtercard connects to. There is a resistor on there in the vert section that is sometimes iffy. I'm on the wrong computer, otherwise I'd look up which one...
 
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