[TechAssist] Re: CTC167 chassis, small, dark, blurry picture.

From: "Christopher Barnak" <cbarnak@xxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Date: Fri, 03 Dec 2004 08:06:51 -0500
Kevin,

Your regulated voltage should not vary. No matter what the load,
something should blow.
Pay special attention to the regulator circuit. And make sure the Raw
DC is clean. You could
have a bad filter cap. Scope it out.  Just a guess. 

Christopher Barnak, CET
Norfolk School Plant Facilities
Electronics Division
966 Bellmore Ave.
Norfolk, Va. 23504

Phone 757 628 3385
Cell      757 373 7027
Fax      757 628 3392
cbarnak@xxxxxxxxxxxxx


>>> kevintv@xxxxxxx 12/2/2004 2:07:48 PM >>>
Thanks, Phil.  I spent time on this dog lost night.  This is what I
found:  B+ varies between 108 and 120 volts.  HV measured 24 kV the
one
time I checked it.  The higher the voltage the wider the picture, of
course.  I replaced SCR4101 (780-9) in the P/S with 780-7 and no
difference.  I replaced the HOT with a large 100 ohm resistor and the
B+
was a stable 140 volts.  I removed the HOT from circuit and it tested
good with high meg on my ohm meter.  Something is dragging the B+ down
and the only thing I can think of is the flyback, which doesn=92t make
sense to me.  Am I missing something? =20

Kevin Wilks
Kevin's TV & Video Repair
Penticton BC Canada
kevintv@xxxxxxx=20 
=20

-----Original Message-----
From: techassist-bounce@xxxxxxxxxxxxx 
[mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Phil Bader
Sent: Thursday, December 02, 2004 6:55 AM
To: techassist@xxxxxxxxxxxxx 
Subject: [TechAssist] Re: CTC167 chassis, small, dark, blurry picture.

Here's all my CTC166/167 series file cards. Tho some are not same=20
symptom, they are common failures and may relate to it indirectly:
Intermittant vert: SMD R4509 between error amp and U14501 pin 6.
crack=20
in board trace.
Intermit. blacks out,has sound: front of vert output IC, replace
C164=20
(100mf@25v) and traces eaten underneath it. Another known bad cap
is=20
C4502 (220mf@35v)
 Excess bright,retrace: Q2901 leaking.Luma buffer, use NTE159.
Many size issues also relate to bad LA7831 vert IC.
Hope these help. Also known for tiny traces being eaten thru by cap=20
fluid.Especially at front under vert area.
Phil Bader

Kevin wrote:

>It sounds like a B+ problem, but I am not familiar with the CTC67
>chassis.  I tried to go to the wa6ati.com site and I was not allowed
in
>for some reason.  Any tips on this chassis?  Thanks. =20
>
>Kevin Wilks
>Kevin's TV & Video Repair
>Penticton BC Canada
>kevintv@xxxxxxx=20 
>=20
>
>
>
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>

--=20

Philip Bader
Jan Phyl TV Inc. (estab. 1976)
3420 Recker Hwy. Winter Haven, Fl. 33880
Fax (863) 299-8821
email: tjanphyl@xxxxxxxxxxxxxxx 



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[TechAssist] Re: CTC167 chassis, small, dark, blurry picture.

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