Recently, my Hyundai ImageQuest Q910 19" monitor has been acting up. Occasionally, there would be flashes across the screen, similar to what you get when a fridge shuts off nearby.
Over a week or two, the flashes become more frequent. One day, there was a big one, spanning maybe 10% of the frame. Later that day, I smelled something burning in the monitor and turned it off in a hurry.
There is no obvious damage inside. Where would you look first ?
-- André Majorel "No meetings were held, nor secret handshakes created, to allow a Seria- list Elite to disenfranchise the (tonal) non conformist. None had to be." -- Wendy Carlos
Does it actually still work ? First suspicion would have to be bad joints. Could be almost anywhere such as PSU, HOP stage or CRT base. Have a tap around with a long insulated stick such as a piece of wood dowel. If you do it in subdued lighting, you might even be able to see the arcing from a bad joint.
Arfa
Yes. I've had to use it a couple times and had no problems, though I haven't left it on longer than necessary (i.e. about a minute each time).
Thanks. What's HOP ? Horizontal Overnight Permission ?
-- André Majorel "No meetings were held, nor secret handshakes created, to allow a Seria- list Elite to disenfranchise the (tonal) non conformist. None had to be." -- Wendy Carlos
If that is a CRT monitor, the Fly back is suspect!.
HOP is horizontal output. This stage is responsible primarily for producing the high level signal that drives the horizontal deflection coils on the CRT neck. However, it has a number of secondary functions such as the generation of supplementary power supply rails, and pulses used by other circuitry. Another function of this stage is to generate a very high DC voltage for the CRT, and this is done by an overwind on a transformer. Other high voltages for the CRT are also generated here. It is not uncommon, as Jamie says, for those high internal voltages to cause insulation breakdown within the transformer, and occasionally for them to cause a pin-hole puncture in the transformer case. Usually, when this happens, you can see corona discharge around the hole, or sometimes even lightning (!) if there is metal nearby. You can often smell ozone also. However, from your description, it is less likely that you have a faulty transformer, than a bad joint. Bad joints often form on the pins of this transformer.
Arfa
I have had this on some models of monitors. Most of the time it was the flyback transformer and HV multiplier assembly. Sometimes the CRT was arcing internally.
I don't want to dissapoint you, but you should be seriously shopping for a new monitor.
Jerry G.
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Methinks he wanted to fix the son of a bitch he has now, not replace a nice CRT with a crappy LCD.
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