Need help on diagnosing TV with bad HO-Stage

actually a

but

are glowing,

(type S2055N).

least for DC) on

as suggested by

transformer

Okey, I got further. The short from emitter to collector is normal and comes from the flyback coils (didn't know that before, read that in the FAQ). I measured the B+ across C and E of the HOT and it reads about 140 Volts. If I turn the screen voltage, I can finally see a raster, but there is still no picture (e.g. noise or OSD).

Any hints ?

Adrian

No hints but you'll need a diagram to back track to where your video is lost. Do you have any sound? If not your problem 'could' be early in the signal path.

actually a

but

I have no record of the schneider 9.6 chassis. are you sure it is schneider not beko or something? how old is the set? post some jpegs on fileden.com or you send it and we can try and give more specific help.

re: fault: likely open resistor or bad cap in the RGB stage. star on CRT neck pcb and trace it back from there.

-b

No Screen supply to the CRT Drive Board, Check the source for open resistor, shorted diode, leaky electrolytic, Etc. Derived off the LOPT.

The OP went on in a follow up to clarify that if he turned the screen voltage up he got a raster albeit no snow or OSD.

It's definetely a Schneider 9.6 chassis, it's clearly printed on the PCB . I am busy today, but I will do further measurements on the CRT-neck-board tonight. Thanks for all your help so far !

Adrian