[TechAssist] Re: PTK 169bu no apparant raster!
- From: "Jeff Dougherty" <support@xxxxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Sat, 16 Nov 2002 14:35:59 -0500
Tommy,
What is the model number also.
This would help to determine if you have a big screen, .PIP function, etc.
On high voltage board, look for an open/burnt resistor.
Jeff
FAX 717-564-4952
Jeff Dougherty
Intrepid Video & Electronics Be careful of your thoughts.
501 Luther Rd They may become your words
Harrisburg, PA 17111 any moment.
717-909-8844
VCR tips, electronics info & general interest.
www.intrepid-video.com www.tech-repair.net
www.thetoolcaddy.com www.9-11-2001tragedy.com
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----- Original Message -----
From: <Hermantvr@xxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Saturday, November 16, 2002 9:51 AM
Subject: [TechAssist] PTK 169bu no apparant raster!
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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