Please help

cool_factor

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Probably something simple, sometimes cab turns on fine, sometimes it turns on blind (sort of). No matter the pcb, I have a couple that work fine in friends cab. You can here the hum of CRT but no image. Now when you turn off, cab you get a very brief flash of colors like turning off a tv and also CRT tube glow. I took a video but it won't let me upload. I attached some screen shots of the paused video and you can see that there's an image as its turning off, it's just not displaying! Thoughts? 25" std res qnic cgm2500 chassis.
 

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Probably something simple, sometimes cab turns on fine, sometimes it turns on blind (sort of). No matter the pcb, I have a couple that work fine in friends cab. You can here the hum of CRT but no image. Now when you turn off, cab you get a very brief flash of colors like turning off a tv and also CRT tube glow. I took a video but it won't let me upload. I attached some screen shots of the paused video and you can see that there's an image as its turning off, it's just not displaying! Thoughts? 25" std res qnic cgm2500 chassis.

This is after you recapped the monitor?
 
The original issue way back last Sept. was vertical collapse. Sent out the chassis for a rebuild. Was recapped and if memory is correct HOT was changed. Got it back and CRT was working but dull, did a CRT swap and it worked great for awhile, maybe a month. Then when you'd power it on it would come on but if you bumped cab hard it would cut out then come back on. Thru testing found the PS was failing bad. Replaced it and it worked great for awhile. Now, here we are again with the not showing a picture at times. There's a gremlin somewhere... All wiring has been checked and all questionable connections replaced or fixed. I just can't find the gremlin. As mentioned the picture is there...it's just not being displayed. When I'd power off cab I noticed the quick glimpse of games image no matter the pcb I used. I just don't know what to look for for this issue.
 
Post some pictures of your chassis. Both sides. (You'll need to remove it, take pictures so you remember how it is connected.)

Some members here can spot bad solder joints like you wouldn't believe from online pictures.
 
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