HELP! G05-801 top right screen collapsing

Tenn_pin

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Pictures now:HELP! G05-801 top right screen collapsing

What would cause this to happen? To begin, my Astroids screen was missing the right half of the screen. I knew I had to resolder the headers, but decided to do a BR cap kit and the filter caps as well. Now the screen is collapsing from the top right. I have reflowed every joint on all 3 boards, replaced fuses, and checked all of my caps and transistors. I have spent all day with this machine (not that I mind since the in-laws are here), but now need some help.
Thanks,
Randel
 

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Sounds like you have a bad driver transistor. While the game is on wiggle one of the wire bundles to the driver transistors and then the other. If the screen changes while you are wiggling it you have a bad connection on the board at the header or the connection from wires to connector. If there is no change you have a bad driver transistor in one of the pairs. Remove one of the power transistor pairs and power up to decide which pair are bad.
 
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Driver transistors

I replaced all 4 transistors, but did not resolder the connections. I will try that and post pictures if it doesn't work.

Thanks,
Randel
 
Picture

Sorry for the grainy pic. My wife has the camera and all I have is the phone. As you can see, the top and right of the screen is moving in and out of the center. I unplugged the driver transistors and the lines left behind are moving in and out still.

Thanks for any help,
Randel
 

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More pictures

Sorry, wish I knew how to add a video.
 

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Pictures in test mode

These show better what I am asking about.

Thanks,
Randel
 

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More problems

Well, I plugged in a working board and the monitor is doing the same thing, so I know this is a monitor issue. I noticed smoke coming from the lower board of the G05 and R103 was smoking. I replaced it with a 1k, 1 watt 5% (though the book calls for 390 ohm, 1 watt 5%) because I pulled a 1k, 1w, 5% out of it and R102 is a 1k, 1w, 5%. Now my spot killer is on, so now I am going to pull the deflection board and resolder the damn thing 1 more time.
 
When you did the cap kit and changed the transistors.. did you make sure to carefully remove and re-use the plastic wafers and add new heat sink grease?
 
Re-solder EVERY header pin on the deflection and HV boards, not just the ones that look like they need it.
 
I am going to pull the boards and resolder them again when I get back home. This time I am going to add solder to each joint so it will help.

Thanks to all of the help. I will finish this thread until it is fixed.
 
You can't change the value of a resistor when you replace it. You can however keep the same resistance value and increase the power rating of the replacement.

At this point you need a friend with an Asteroids game to put your logic into his working game or a known good working monitor to differentiate if your problem is in the game logic or the monitor. You could have more than one thing going on.

You have replaced the transistors and the problem stayed the same. That tells me that the problem is not with the transistors.
 
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