Baby Pac-man monitor issues

Konidias

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So my Baby Pac-man has had this issue since I got it... There's green bleed coming from the graphics and it sort of drips downward. The green pot on the vidiot board basically seems to do nothing and when I tweak the green pot on the neckboard it goes from insane neon green to dark black green with a tiny sliver of space in between for a green that looks normal but has this weird bleeding happening.

AKOt2RH.png


It's hard to tell from the blurry crappy photo but you can see underneath the text sprites there's a green "edge" and it's worse on certain things while not effecting other sprites at all.

Also I realize the monitor is very red looking... it's probably because I tried to tweak it before it had time to warm up yesterday. But rest assured, I can get a nice black and nice colors otherwise.

So what could be the issue here? Here's what I've done so far just to rule things out:

1. Cap kit on monitor chassis
2. Replaced pots on vidiot board
3. Switched around pots on chassis to see if one was a dud
4. Completely replaced the chassis with a new one

So from this list we can conclude that it's not the monitor chassis causing the issue, and it's not the pots on the vidiot board...

Could it be some other issue with the vidiot board? I feel like this has to be some sort of signal problem at this point as it surely can't be that two monitor boards have the exact same issue.
 
I feel like that would be quite difficult for me to set up, so unfortunately I don't think that would be an option at this time.

I felt the same way when I was chasing down problems in my Baby Pac monitor. Trust me - take the time and pull the monitor to put on another game (or drag another game close by). I think it is critical to isolate monitor versus PCB especially in this game with the vidiot board and it's known problems.

Just my two cents - eliminating 50% of your guesswork is ideal place to start.

Also may want to mention what monitor it has in it.
 
I felt the same way when I was chasing down problems in my Baby Pac monitor. Trust me - take the time and pull the monitor to put on another game (or drag another game close by). I think it is critical to isolate monitor versus PCB especially in this game with the vidiot board and it's known problems.

Just my two cents - eliminating 50% of your guesswork is ideal place to start.

Also may want to mention what monitor it has in it.

Yeah but I'm really fairly certain it's the vidiot board, just basing it on the fact that I've tried two different monitor chassis with the game and it's the same on both.

Currently it has a WG K4800 13" board
 
Yeah but I'm really fairly certain it's the vidiot board, just basing it on the fact that I've tried two different monitor chassis with the game and it's the same on both.

Currently it has a WG K4800 13" board

Uh oh... Yeah... Might be a fair conclusion. I missed the chassis swap comment I'm sorry. It could be your tube though which might explain the issue... Would be helpful to eliminate that.

That being said - there are a few guys on here (listed in the repair sticky) that know these boards inside and out. I believe cdjump is one. He worked wonders on my Tron board!
 
So I fiddled with the settings more... I got the bleed to go away so it looks pretty good now!

It's still really sensitive but it seems to be fine even when the kickout holes fire and whatnot...

I noticed I can make the "effect" change when I was jiggling the vidiot board but I honestly couldn't track down a specific connection that was causing it... It might just be cold solder or something because I wiggled each connection and there was no change, but when I gave the board a little shake it was doing stuff to the screen.

For now it looks great though so I'm just going to cross my fingers and hope it stays that way for a while. :)
 
you can use my video to help you color and wite balance your monitor.

start at the 18:00 mark.


if your chassis has not had caps and a good re-flow, i would start there first.

if you need parts i have them.

if you need it fixed, your welcome to send it in.


Peace
Buffett
 
you can use my video to help you color and wite balance your monitor.

start at the 18:00 mark.


if your chassis has not had caps and a good re-flow, i would start there first.

if you need parts i have them.

if you need it fixed, your welcome to send it in.


Peace
Buffett
Thanks Buffett! I capped it the other day and it's looking great!

004212bb4e1275d636933a62794683d9.jpg

cdf438ea3d6b5c1d6f015886b33b7bc6.jpg
 
Oh and Buffett, capping a 4800/4900 is a cake walk, took me all of 15 minutes. I see why you like them so much. The board is well labeled on both sides as well!
 
Thanks Buffett! I capped it the other day and it's looking great!

004212bb4e1275d636933a62794683d9.jpg

cdf438ea3d6b5c1d6f015886b33b7bc6.jpg

Awesome!!
that is a fine looking game.

Oh and Buffett, capping a 4800/4900 is a cake walk, took me all of 15 minutes. I see why you like them so much. The board is well labeled on both sides as well!

yes, they are a fun chassis to work on.
they look good and you can adjust most everything.

i can roll threw them fairly fast myself.

they can also be a B%$#H to fix when the PCB gets cracked.


Peace
Buffett
 
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