[TechAssist] Re: PTK 169bu no apparant raster!
- From: armando guerra <birdie@xxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Sat, 16 Nov 2002 09:23:45 -0700
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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