Sorry to ask you guys a computer question again...

[karmaman]

I will check if Fry's has it tomorrow. I just got home, and according to the schematic, Q901 is responsible for HV REG OUT and Q902 is responsible for HV OUT. Would that be directly related to deflection? They are both on a heatsink next to the flyback.

[Eric H]

HV would probably be High Voltage, since you have a line across the screen you have high voltage and the horizontal is working. a flat line scross the screen means your vertical isn't working, could be a bad cap, transistor, IC or solder joint.

[karmaman]

Horizontal is not working, I get a vertical line going down the screen. Or at least, I did for a few seconds before I shut off the monitor. Now, it degausses and then the power light starts blinking.

EDIT: BTW, Q901 and Q902 don't look burned or damaged in any way.

[karmaman]

Bad news.... found some bad caps and swapped them, also did a lot of cleaning to the neck board, there was a load of brown crap all over the place (dried flux I believe). Now, when I try to power on the monitor, I get no degauss, no HV, and no heater voltage. The power light turns green and starts blinking. I'm positive I got all the wires hooked up right.

Help? I knocked a SMT resistor off the board by accident, the value was 0.01MF, 50V. Surface Mount pisses me off, that thing was smaller than a crumb. I was unable to get it back on, then I lost it, so I bridged the two connections with solder. Could that be it? This was on the neck board.

[radiotvnut]

Originally Posted by karmaman

Bad news.... found some bad caps and swapped them, also did a lot of cleaning to the neck board, there was a load of brown crap all over the place (dried flux I believe). Now, when I try to power on the monitor, I get no degauss, no HV, and no heater voltage. The power light turns green and starts blinking. I'm positive I got all the wires hooked up right.

Help? I knocked a SMT resistor off the board by accident, the value was 0.01MF, 50V. Surface Mount pisses me off, that thing was smaller than a crumb. I was unable to get it back on, then I lost it, so I bridged the two connections with solder. Could that be it? This was on the neck board.

That surface mount part is actually a capacitor rated at .01 uF @50 volts. You can replace it with a standard .01 uf cap rated with a voltage rating of at least 50 volts. When you bridged the connection, that created a short that could very well be causing your new problem. Maybe you'll get lucky and it didn't take anything else with it.

You're not the only one that gets PO'd at SMT devices. A great deal of consumer electronics is 95% (or more) SMT. The only economical way for repair is a new board. I recently repaired a newer JVC TV that had two open SMD resistors on the neck board. These resistors were, IMHO, too small for their task. I just took two through hole standard resistors and tacked them to the PC board and it worked fine. IMHO, SMT technology has no place in high voltage, high current, or high temperature applications.

[karmaman]

aargh!

The capacitor was indeed making the monitor act funky. I replaced it with a normal through-board one and the monitor now degausses and I get HV. BUT that was not the problem. It's now doing the same thing it was before: degausses, then the power light starts blinking yellow (because horizontal collapsed). I feel like crying (metaphorically, not literally). I replaced 6 caps in there, 3 were borderline and 3 were way off the correct readings. One was bad on the neck board, two were bad on the chassis, two more on the chassis were borderline, and one on the neck board was borderline. These are all quality caps too, there were mostly Rubycons and Nichicons in there. Nothing looks burnt or damaged in there, trust me I looked. I've become quite familiar with this monitor (literally spent all weekend working on it). I still haven't checked ALL the caps in there, probably half maybe. All HV caps (there were only 3 brown caps in there) checked out fine. So did the huge filter cap.

Q902 and Q901, both are three pin devices on a heatsink, don't look burnt or damaged in any way. Should I rule these out, or could they be bad anyway?

I will try and test the rest of the caps in there today. Any suggestions? You guys are my only hope. I really don't want to pitch this monitor, I really like it and it's got dual inputs, one VGA in the front. It comes in handy all the time because my friend regularly brings his Xbox 360 over and we play on xbox live. I doubt I'll find another computer monitor with a front input, let alone one that's also a Trinitron.