In looking ahead, to answer your question I myself have had bad IC's
that were new.

Because the drive IC had to be changed, it would be a good idea to see
if there is anything unusual that could have caused it to fail in the
first place. I have had everything from a CRT that arcs intermittantly
to components becoming defective in the circuit area that works with
the IC.


Jerry G.

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On Sep 11, 3:10*pm, 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