D Yuniskis wrote:
Sylvia Else wrote:
I bought this on Ebay for $5.50 on the off chance that I could fix it.
It was described as having lost picture with a "pop", and with the
observation that a TV repairman said it sounded like it could be a
power supply issue.

I've determined that the sound works OK, as does the tuner and video
signal stage - it outputs the composite video on an AV out socket.

It's clear what produced the "pop" noise.

http://members.optusnet.com.au/sylviae/tv1.jpg

http://members.optusnet.com.au/sylviae/tv2.jpg

The diode *looks* OK. Though it seems like there
might be a wire or maybe some "glue fibers" draped
across it?

Presumably this diode shorted out. It's on a board close the EHT
circuitry.

I'd look at the switching transistor (HOT) first.

But what are the chances that that's all that's wrong with it? Just
getting the board out to gain access to the underside will be a fairly
major exercise.

grin You should see what a nuisance some of the high end
Sony monitors are (were?) to service! :

As far as I can see, and despite the numerous headers, it's impossible
to remove the circuit board from this TV without desoldering some wires
from it. I rather think it was never intended to be repaired. However,
with some of the unpluggable wires unplugged, there is just enough slack
in the remainder to prop the circuit board up into a vertical position.

Based on the described "pop" symptom, I was looking for something
showing physical trauma, but if there's any visible, I'm missing it, and
I've spent a good while looking.

I've established that the HT (190V) is present at the powersupply.

The switching transistor seems OK

Sylvia.