No picture 42PC3

[paulstef]

Re: No picture 42PC3

-VY ramps up from 0 to 27V in about 5ms, then stops and tries again afterabout 12ms. Does this a few times then stops and tries again after some more time.

What do I supposed to have on -VY?

[paulstef]

Re: No picture 42PC3

Ok, from the label on the panel it seems I should have -180 on -VY.

[paulstef]

Re: No picture 42PC3

IPM is ok, no other bigger semiconductor is damaged. I separated the buffer from the sustain board, still the same weird -VY voltage ramps. Why they don't just give us the schematic!!!!

[paulstef]

Re: No picture 42PC3

Just to conclude, it turns out that the little pnp- transistor Q2 in a SOT-89 package on the Y-sustain board, driver for the bigger transistors on the heatsink was also damaged. Tv works.