[TechAssist] Re: PTK 169bu no apparant raster!
- From: "al m" <ampm@xxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Sun, 17 Nov 2002 08:15:31 -0500
I had the same problem with a direct view and Mando called it ,it was a
broken trace on the left side of the power supply. Worth a look.
al marquardt
ampm@xxxxxxx
----- Original Message -----
From: "armando guerra" <birdie@xxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Saturday, November 16, 2002 11:23 AM
Subject: [TechAssist] Re: PTK 169bu no apparant raster!
>
> This may or may not be your problem but its worth looking at.Put the
chasis on an
> upright
> position and carefully look at the very first pc trace on the left side of
the
> bd.I think its A26 .This trace will break off and will cause no video at
all.
> Mando
> Birdie's TV & Electronics
> Casa Grande, AZ
>
> Hermantvr@xxxxxxxxxxxxx wrote:
>
> > Asked about this one before, still no fix and have not been able to find
> > problem. NO raster...if I run screen control up there is a slight raster
with
> > retrace lines....this means the sweep circuits are working. TTP 98-004
says
> > to troubleshoot the scan loss circtuit for this symptom. The bulliten
says
> > that pin 8 of U7005 should be VCC for the scan loss circuit, however
there is
> > nothing connected to pin 8 of that IC. If I use RCA's wonderful
schematics I
> > have to run through pages and pages of service data and still cannot
find pin
> > 8 of U7005. I can physically find it on the IC and there is no trace
going to
> > pin 8 the schaematic shows only the comparator pins on U7005 but it is
hard
> > if not impossible to troubleshoot this circuit with out more info. any
help
> > will be .....well.... help!!! thanks!
> >
> > Tommy Herman
> > Herman TV
> > 250 School Ave SW
> > Taylorsville, N.C. 28681
> > 828-632-58322 Voice
> > 828-632-3880 Fax
> > hermantvr@xxxxxxxxxxxxx
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