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Philips 17A280BQ (Brilliance 17A) picture too bright, washed out; G1 spiky

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Frank de Lange

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Philips 17A280BQ (Brilliance 17A) picture too bright, washed out; G1 spiky

(Frank de Lange) wrote in message . com...
This monitor came out of powersave mode, I heard and saw a spark
somewhere inside (sparkgap?), and the picture cam up washed out and
way too bright. Retrace lines were visible, picture got bigger/more
washed out, turned unit off.

I found the problem:

On the CRT board, top right, solder side, in the +195V (measured, I do
not know the design voltage as I do not have a schematic
diagram/service manual) supply line, a (surface-mounted) diode had
turned into a useless o/c glass tube. This was caused by sparkover on
the component side between the supply line and ground (caused by???
dirt? bugs?).

(This does not seem like a normal failure mode for this monitor...)

Replaced the diode with something which measured more or less
identical on my DMM (there's no ID on those SM diodes, and I do not
have a schematic diagram...), turned it on, it works.

Cheers//Frank

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