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Sony Trinitron BVM-1416P issues

DominicLH

Sep 30, 2018
1
Joined
Sep 30, 2018
Messages
1
I am having some deguassing and composite video problems with my sony trinitron.

When I first got this monitor it was in need of degaussing but the deguass button was not yeilding any responses. I took this monitor into a local store to be serviced, two thermistors had to be replaced and a degaussing wand was used. However the discolouration partially remains and is slowly increasing despite the fact that the degaussing circuit appears to be working.
20181001_022607.jpg

Any composite video on this monitor also appears desaturated and the chroma setting has to be manualy set higher to make it appear normal. I suspect this may be something to do with expansion board b5 as the sticker below suggests it is used to control chroma.
20181001_022909.jpg

Certain components inside the monitor as well as the roof of the case are also coated in a black residue and I am unsure as to if this is a problem.
20181001_022851.jpg
20181001_022926.jpg
20181001_023000.jpg
20181001_023013.jpg

Any help or advice would be greatly appreciated.
Cheers
 

kellys_eye

Jun 25, 2010
6,514
Joined
Jun 25, 2010
Messages
6,514
The black stuff is just dust attracted 'electrostatically' by the insides. Not an issue unless it's really thick but a soft brush and vacuum will fix any issues there.

What do you have externally that could cause the gaussing problem? Metal table?

The degaussing circuit in professional monitors should be able to deal with anything under normal circumstances and even exceptional circumstances. Have the degaussing capacitors been tested? They do have a habit of failing and simple replacement is a cheap repair.
 
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