[TechAssist] Re: Proscan CTC 169bg5 shut down

CR4402 CR402 often fails along with C4402.  I am not sure if it will cause the
fly not to ring.
Q4802 sometimes shorts, which drives L4803 but this ususally causes excessive
width.
It might cause high voltage to go up enough to shut it down. I am not sure.

Can you scope the horizontal output and see if the waveform is normal.

Joe Batchelor

Tomlee wrote:

> Hello fellow tech.
> I am working with ctc 169bg5. with the help with other techs Perry, JBC.I
> force to turn on the tv by apply 5v at base of
> Q4306. But the tv show a sign of on and off  cycle. I do not hear the sound
> of high  voltage . I use the sencore to ring the
> flyback by one end of probe to the B+ and the other end to colector of HOT
> as sencore manual direction. But Get zero
> ring .If I remove cr402 and L803 I will get maximum 30 rings.(The HOT
> colector connect to ground by 2 diode CR 401 and cr402  ). I means If The
> HOT collector connect to ground or connect to pincustion circuit(through
> L803) It will make zero ring on flyback test.Does this means somthing wrong
> at pincushion ckt or B+ to ground ckt . I measure no short to B+. .
> May be it is only short to horizontal frequency?.Any Ideas from experince
> tech is appriciated.I spend too much time for this .
> Dang TVCR
>
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