On 2005-11-13, wrote:
On 2005-11-13, Andre Majorel wrote:

Last time I powered it, my Iiyama HA202-DT made a cracking
sound, similar to the sounds CRTs make when powered on, but
longer, louder and ominous. The screen is completely black and,
when fed a video signal, the monitor keeps "resetting" itself
every few seconds (the same "click" it makes when changing video
modes).

I suspect something in the high voltage circuit is blown but see
no obvious sign of damage. Any ideas ?

It sounds like the switching power supply is detecting an over-current
situation and is shutting down, then trying to restart itself again. I
would check the diodes in the secondary of the power supply and all
large transistors and diodes in the horizontal/high-voltage section.

Thanks. The rectifier bridge is rather well hidden but I checked
the semis on the left side. There is a big transistor (Toshiba
2SC5570, horizontal deflection output) with a dead short between
pins 1 and 3.

I don't have the schematics to check, but a short between the
base and the emitter seems suspect to me. Not that I'm an
expert, mind you.

--
André Majorel URL:http://www.teaser.fr/~amajorel/
It's a good life, bowing to a tyrant.