Asteroids deluxe no video

starfighter2

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I also have a post in another section but thought that this may be more of a monitor issue. I have been working on this thing for some time and would just like to get it done. Before I had the spot light killer on. I checked all the fuses, transistors, and tested the resistors in the spot killer path. I had checked the wires in P100 from the game board to the deflection board and found some wires in the incorrect place and fixed that.

currently. The spot light killer is now off, I have the tube guns fireing and can see a glow in the neck tube. Also hear a hum from the monitor. However, There is no video. I tried to change the contrast and brightness on the deflection board but there was no change.

Looking for suggestions on what and how to test next. Thanks
 
The following applies to either the GO5-802 or 19v2000 monitor used by Atari.
And you know you have deflection going out of the pcb and you hear the chattering on
the deflection board.

Has the monitor ever been recapped?

If yes...I'd suspect the inline HV diode has failed (first thing I'd suspect).
If you hold your arm up to the connected monitor when powered up you should feel static electricity when you hold your arm hairs up by the picture screen. If not, you probably don't have high voltage in the CRT. I have seen the HV transistors fail too, but it is not as common.

If no, time to put a cap kit in the monitor and hope the capacitors get the high voltage working right again. There is other posts on doing the cap kit...make sure you discharge the CRT to ground using a 1M ohm resistor inline to prevent damage to the HV Diode, if it is still good.
 
I did install a Bob Roberts cap kit with xsitors as one of the first things. It is possible the xitors has got damaged and will double check those. I also have a couple of the HV diodes and had changed that out again a while ago and it could be damaged and will try and replace that. I'll also check as many of the components in the HV cage as I can. Are there any techniques on testing the flyback (or big black component to the anode cup)? Anything to look for?

2ng what should the values/volts be going into the HV unit via the connector. I would like to check that to make sure that it is still not a deflection board issue....
 
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