Without the proper technical training, supervised monitor service practice,
and service manuals, this would be very difficult to service. By the sounds
of your question, you should get some supervision. These monitors can be
very dangerous (safety hazard) to mess in. The power drive to the horiz
output is very high in current and the voltages under operation are also
very high.

The HV generator, sometimes referred to as the horiz output transistor is on
a heat sync near to the flyback transformer. If it is blown, then most
likely there are other parts that have also failed. Upon replacement, the
cause of failure must also be serviced.

Also, the scan amplifier sections can be at fault, including the power
supply itself. The tech would start by verifying the power supply
performance first, before directly getting in to the horiz output stage.

--

Greetings,

Jerry Greenberg GLG Technologies GLG
=========================================
WebPage http://www.zoom-one.com
Electronics http://www.zoom-one.com/electron.htm
=========================================


"Shaun Guth" wrote in message
news Hello,

I have read the FAQ for the newsgroup, but I'm pretty new when it comes to
monitor repairs.

I have a 21" Viewsonic P815 that won't display any picture at all. When
you plug the unit in and power it up the front LED light indicates power,
and also switches from green to orange if there is no video signal
attached. The very back of the neck glows, and after about 10 seconds or
so the monitor emits a high-pitched whine/pop for just a brief second
which causes the other monitor in the area to wobble a bit (is this the
auto-degauss kicking in?). Screen is always completely off (no static).

My research online seems to suggest that I should be checking the
horizontal output transistor first, but I'm unsure of what it looks like
or where I should connect my probes. Any books you'd recommend on
where to learn this stuff?

I'm not really vested in this monitor, but I picked it up for free and
figured there may be something relatively inexpensive and easy for me to
fix with my basic grasp of electronics. Anybody that can offer me some
tips or diagrams on how to proceed would be great. I checked the fuse on
the mainboard for continuity already, so that wasn't it.

Thanks,
Shaun