v2000 deflection board failure

Pimpbot5000

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I'm on working on an Omega Race with a v2000. I've just put the monitor back together including a new HV diode as described here. The game boards themselves are a work in progress, but I got them to the point where I could tell the attract mode was running without the monitor plugged in. I installed the monitor in the game and powered it up. The Omega Race attract mode was displayed. However, the Omega Race test mode would not display, it was just a series of scrolling diagonal lines. Back to normal mode, attract mode shows up fine... for a few minutes. After a few minutes the screen went blank, with a few random flashes here and there. Every now and then it would start to display the attract mode, and then flake out again.

I suspected the game boards even though I could tell the program was running. That is until something blew up in the monitor. I quickly turned off the power, and this is what the deflection board looks like now:

CIMG4936.JPG


CIMG4937.JPG


So my question is, what could have caused this failure? Is it possible the output from the game boards themselves could have caused this? Thanks for any help...
 
So I installed an extra deflection board I have, and the exact same thing happened. Resistor R613 started smoking so I quickly turned it off. Is it possible that I've messed something up in the HV assembly when I replaced the HV diode?
 
I came across this in the B&W Vector Monitor FAQ:


Symptom: R613 and R618 Are Fried.

Check to be certain that none of the leads (including the heatsink) of Q606 or Q607 is shorted to ground. Also check D606 or D607 to see if they have opened. This would crank all the currents up and destroy R613 and R618.

Also check for bad solder joints or a hairline crack in a trace. I would check the pins that connect to the large transistors mounted on the side REALLY closely. I would also do a continuity test on all the pins.


This seems to describe my problem exactly. It seems very unlikely that both my boards would have the exact same problem. To me that points to a problem external to the board... right? I'm going to replace the frame-mounted transistors and all the burnt components and see what happens. Unless anyone has any other suggestions?
 
Well I've replaced a number of components and the deflection board no longer catches on fire. Unfortunately I have no picture. The heater is glowing, I can hear vector chatter, the spot killer is not on, no fuses are blown. I can feel static on the front of the monitor. The brightness and contrast controls do nothing.

What should I do next?

Components replaced so far:

HV diode.
All capacitors that are included in the cap kit.
Frame-mounted transistors.
R605
R608
R613
R614
R618
D606
D607
Q602
Q603
Q605
 
Unfortunately plugging the monitor into the game is the only way I have to test it. I'm convinced the game is outputting something. I can hear the vector chatter change as different portions of the attract mode come up. And the spot killer is off.

I forgot to mention earlier that I reflowed all the header connections. I also verified all the voltages at J900 on the HV board.

A piece of paper will static cling to the screen when it's running. It seems like I have HV?

Monitor gurus, please chime in.
 
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