Maker Pro
Maker Pro

Unstable vertical hold and buzzing on sound on tv

M

Martin

Jan 1, 1970
0
The tv is a Contec colour tv. Picture is randomly unstable
vertically and a buzzing noise is superimposed on the sound.
This happens as soon as the tv is switched on. The symptoms are:
holding for a few seconds and then fast rolling; sometimes stopping
and holding halfway with a half inch gap separating the top and bottom
of the picture running across the centre of the screen with what I'd
call 'noise' in this gap - thousands of white flecks filling this half
inch gap (don't know if that's normal, but it looks as if it is
associated with the buzzing coming out of the speaker).

I have checked for and fixed bad connections and also replaced the
vertical sync IC without effect.

Any suggestions for further troubleshooting the faulty component very
much welcomed.

Martin
 
S

Sofie

Jan 1, 1970
0
Martin, you might want to now focus your attention on the PS........ check
the electrolytics for high ESR and replace as needed....... also check and
replace if necessary the regulator.
 
Top