[TechAssist] Re: CTC169, 27" TV with black video, OSD works

From: Kevin <kevintv@xxxxxxx>
To: techassist@xxxxxxxxxxxxx
Date: Sun, 22 Jun 2003 12:55:48 -0700
I forgot to mention that I checked the video input with the same
results.  If the OSD works why am I looking in the wrong area?  What
area should I look in?  I had a different RCA chassis (a 20") a few
years ago that had a shorted 220uF cap in the vertical blanking circuit
that gave the same symptoms--black picture with OSD working.  As a test
last night, I put the old cap back in and did not get the vertical line
like it had when it first came in.  So maybe it is something that came
undone as I was changing C4403.  I will check all the connectors AGAIN.
Boy this is a frustrating one!

Kevin Wilks
Kevin's TV & Video Repair
Penticton BC Canada
kevintv@xxxxxxx 
 
-----Original Message-----
From: techassist-bounce@xxxxxxxxxxxxx
[mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Intrepid Video
Support
Sent: Sunday, June 22, 2003 9:42 AM
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] Re: CTC169, 27" TV with black video, OSD works

Kevin,
If OSD works, you are looking in the wrong area...double check your
work, perhaps you left a cable
unplugged...easy to do on these babies.
Perhaps you have a bad tuner...try the video inputs...should be your
next step.

Jeff Dougherty
Intrepid Video TV/VCR
263 S Front St
Steelton PA 17113
fax...717-564-4952
www.intrepid-video.com www.tech-repair.net

----- Original Message ----- 
From: "Kevin" <kevintv@xxxxxxx>
To: "TECH-ASSIST" <techassist@xxxxxxxxxxxxx>
Sent: Saturday, June 21, 2003 4:57 PM
Subject: [TechAssist] CTC169, 27" TV with black video, OSD works


I have replaced C4403 to cure my horizontal collapse problem (bright
vertical line).  But now I have no video with tuner. Just a black screen
and tuner audio.  The OSD is working so that is how I know that the
horizontal problem is fixed.  The red, blue and green guns measure 200
volts each-they should measure about 150 volts so that is where my
problem lies.  The larger resistors and transistors on the neck circuit
board are not even getting warm.  The proper color signals are not
getting to the picture tube.  I have difficulty with this type of
problem so any help would be appreciated.  I have replaced Q2906, I have
tested every transistor in the video, vertical, horizontal, and
pincushion circuits (by measuring voltages and comparing them to the
schematic), I have checked for shorted caps in the vertical circuit, the
heater voltage is 5.9 volts, and the screen voltage is 300 volts.
Either I have damaged something as I worked on the set, or the set had 2
problems.  Is it possible for the video to be blank, and for the
horizontal collapse to show a bright vertical line-both at the same
time?  TIA

Kevin Wilks
Kevin's TV & Video Repair
Penticton BC Canada
kevintv@xxxxxxx

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References:
- [TechAssist] Re: CTC169, 27" TV with black video, OSD works
  - From: Intrepid Video Support
[TechAssist] Re: CTC169, 27" TV with black video, OSD works

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