Graz wrote:
On Thu, 11 Sep 2008 20:15:08 GMT, Archon
wrote:

Archon wrote:
Hi , any TV repair folks help out here.

This widescreen TV had a flashover, took out the red output on the
TDA6108JF Video Output Amp on the crt board.

I bought replacement chip and fitted it, now instead of a bright red
screen with flyback lines I get a very bright white screen reduced in
size with flyback lines.

Previously I had Vin of 2.8Vdc, Vout(Cathode) 139Vdc on the dud chip
(remaining working parts)
Now I have 0.8Vdc input and 18Vdc output (Cathodes)

Black current measurement output pin 5 old chip 0.8Vdc, new chip 7.5Vdc

I don't have a schematic, any ideas where to buy ? I'm not in the TV
servicing business anymore, prefer watching them than fixing them but
this is my own TV and I guess I have to fix the sucker.

I don't see any adjustments in this set, is there anything I need to do
to set up/ recalibrate the black level? Isn't this automatic on these
fangled new sets? Is the new chip duff? It did arrive in a polybag,
guess its not that static sensitive. Nothing else reads as out of spec
and using the duff chip, disabling the red output and shorting the red
and green cathodes at the tube gives a reasonable picture.

TIA for any help,

JC
OK, No matter, fixed it, new chip was duff, wtf, lucky I ordered 2.

Are duff chips a common problem? I recently bought a frame output
chip for a Hitachi TV that was shorted across two pins.

In the field I work in now, test equipment/medical no, but domestic
repairs I couldn't say. I did replace the Lopt in a projection TV along
with all the associated stuff that fails with it and that lasted only 12
months where the previous had run for 10 years without problem. That got
binned, just couldn't be bothered with it.