Hantarex MTC 9000 small points maybe missing ground

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mjnman
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Hantarex MTC 9000 small points maybe missing ground

Post by mjnman »

I have a chassis with a first version of MTC 9000 with small white points in the screen, brilliant effect. (below a youtube video)

I tried to:
- replaced all electrolytic capacitors, total recap;
- replaced ceramic capacitor in the neck board C206;
- replaced flyback;
- tested with another tube;
- replaced transistor on the neckboard, TR201-202-203;
- checked all variable resistors on the neckboard;
- replaced RV7 on main board, brightness preset;
- removed fuse 2 then disabled degauss circuit and removed degauss cable;

I checked the main points and seems to be ok:
TP10 - 133.4
TP12 - 11.9
TP13 - 26.9
TP 1 - 24.8
SP11 - 202.9
G2 - 352.2 (ground on the NECK)

I tried to connect a direct ground cable between big heatsink and power socket and there is a little decreases of defect.
Maybe a bad component connected with ground side?
Please, what i can check? i don't know i can do.
In attachment the scheme of chassis and the video issue.

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