I recently picked up three U5000 chassis in hope of getting at least one hopefully two going for a pair of Cruis'n USA cabs. One supposedly working, one unknown and the last looked to be a non working parts donor.
Chassis 1: It was set to CGA mode so I moved the middle connector to the 25kHz plug and removed the vertical sweep update kit connector from TP205. It fired up and was working however the picture was washed out. The contrast on the remote board was turned all the way down and the blacks still were too bright. If I turned the remote contrast pot up just a tiny bit everything start getting overblown and bleeding. Turning the brightness down helped the black level but made everything else too dark. I tried another remote board and I tried adjusting screen on the flyback and several other combinations and could not get it to look right. In the middle of my adjusting the monitor started to get wavy sometimes depending on what I was changing and then it shut off completely and now just does the click click click when turned on. I assume it is a power supply section issue but I am unsure what to look at first. Also, if I do get it going again, is something causing the washed out problem or am I just not adjusting it correctly?
Chassis 2: Hooked it up and it has vertical collapse. R303 is bad, D302 is bad, and the vertical IC (TDA1771) has a visible burnt spot on it, so I assume it is bad also. If I replace all these components, will that do the trick? What else should I check so I don't smoke those parts again because of another bad part? Also, the other board and the parts board has a jumper with a resistor on the bottom side from one of the pins of the Vertical IC. This board does not have that. Is that necessary? Could that be part of the problem that caused the collapse to begin with?
Thanks for any help you monitor gurus can give me.
Stephen