Pacman monitor, no red

AlkalineJay

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Hey guys, Ive got no red on my monitor, and I've cranked both reds up all the way and still getting nothing. Could it need a cap kit? Thanks! -Jason
 
A capkit wouldn't hurt, but that's probably not the problem.

Depending on the make and model of monitor it could be any of these:

Cold solder joints on the video/sync input connector.

Cold solder joints anywhere on the monitor boards.

Bad neckboard transistors.

Bad neckboard trimpots.

Cracks in the neckboard.

Bad picture tube.

No red signal from the gameboard either because of a fault with the gameboard itself or the cabinet wiring harness & connectors.
 
A capkit wouldn't hurt, but that's probably not the problem.

Depending on the make and model of monitor it could be any of these:

Cold solder joints on the video/sync input connector.

Cold solder joints anywhere on the monitor boards.

Bad neckboard transistors.

Bad neckboard trimpots.

Cracks in the neckboard.

Bad picture tube.

No red signal from the gameboard either because of a fault with the gameboard itself or the cabinet wiring harness & connectors.

I just had a monitor last night that was getting "no red", but when I cranked up the red on the neckboard, the screen would go red... so that ruled out pot and whatnots. Ended up being a cold joint at the connector on the chassis that gets signal from the game board.

If you crank up the red all the way, and you don't get a red "wash" on the screen... check the neck. Try swapping the transistors on the neck, swap the red and green transistors. If you lose green, but get red... then that's your problem. Check the resistors on the neck that are linked to red. Also check for cracks, broken traces, etc etc. If all else fails see if you can find someone local with a rejuvenator so they can test the tub itself. If you can't find anyone, call around to local TV repair shops and see if they'd charge you to get the tube tested/rejuvenated.
 
Nope didn't miss it, just got the monitor, and haven't had time to do anything with it other than go "Yep that's alot of red" 4900's aren't my fav to work on so it's back burner while I rebuild my g07 I'll have to go through my stack before ever having to worry about fixing it.
 
So it is a g07, and it looks like r102 and r103 have both burnt out. Are these hard to replace? Im a newb at monitors, but a fast learner.....
 
Nope didn't miss it, just got the monitor, and haven't had time to do anything with it other than go "Yep that's alot of red" 4900's aren't my fav to work on so it's back burner while I rebuild my g07 I'll have to go through my stack before ever having to worry about fixing it.

For the record, my R517 fix is for G07's, not 4900's...
 
Does it look like below??? If so then it could be a board issue (was in my case).

Image75.jpg
 
So, random question, I have lying around a super pac-man FCC filter that has some of the same looking pieces that burnt out on my board, I'm wondering if taking two of those and putting them in the spot of the r-102 and r-103's would fix my red problem?
 
So, random question, I have lying around a super pac-man FCC filter that has some of the same looking pieces that burnt out on my board, I'm wondering if taking two of those and putting them in the spot of the r-102 and r-103's would fix my red problem?


If the resistors on the filter board match the resistors on the main board then yes. In order to verify they match compare the color bands.

Here is a quick method of reading the resistor bands:

http://marvin3m.com/resist/index.htm
 
He's asking if he can rob parts off the filter board.....

Yes, thank you. The filter board I found randomly laying in the back of a Galaga 3/Gaplus cabinet that I bought, and if the same parts are used on both boards, I'd like to just swap out the ones on my monitor board in hopes that the red will come back...
 
If the resistors on the filter board match the resistors on the main board then yes. In order to verify they match compare the color bands.

Here is a quick method of reading the resistor bands:

http://marvin3m.com/resist/index.htm

Thanks! That was very helpful. But it looks like the resistors on the fcc board have five bands, and the ones on the other board are four...so I guess now I need to go about finding replacements.....
 
Radio Shack carries a fairly large selection of resistors. They are more expensive but you don't have to pay shipping. Also, if you have a Fry's nearby they will almost certainly have what you need.
 
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