Sony Trinitron BVM-1416P issues

[DominicLH]

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.


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.


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.





Any help or advice would be greatly appreciated.
Cheers

 

[kellys_eye]

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.