V2000 strange issues...

cysnake

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Ive got a v2000 that looks to have vertical collapse, half way down the screen (top half of screen is collapsed) I have done a cap kit, and rebuilt the X & Y deflection, checked for cold solder joints, replaced the transistors, ect. I havent removed the 2 ceramic resistors yet, is it really necessary? Also heres the strange part, While in attract mode only, I will lose high voltage to the tube for a few seconds, and then it will come back on, and then after a few seconds, itll go off and come back on again. But only in attract mode. If i play a game I wont lose high voltage.:confused: Ive checked the main pcb, power supply, ect in another game and its all good. So its definitely the monitor. Only thing i havent messed with is the high voltage supply on the monitor. Not quite sure where to start there. I didnt figure that would have anything to do with missing the top half of the screen. Am I wrong? Any suggestions? Thanks!
 
The video disappearing briefly in attract mode may be the spot-killer circuit kicking in. (Look to see if the little red LED on the chassis turns on when the display cuts out).

I'd think your problem is likely Q608 or the wiring to it (P600). Swap Q608 with Q708 and see if the problem moves from the top of the screen to the right-half of the screen. If it does, the transistor is bad. If it doesn't, check the wiring/connectors/headers.
 
608 and 708 are good, i replaced them when i did the capkit, and double checked them again, also just replaced the diode bridge and a bunch of other transistors. Still no help. Any other ideas?
 
608 and 708 are good, i replaced them when i did the capkit, and double checked them again, also just replaced the diode bridge and a bunch of other transistors. Still no help. Any other ideas?

Double check your bottlecap output transistors. One might have shorted out or the wire came loose from the TO3 assembly.
 
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