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

  • From: Phil Bader <tjanphyl@xxxxxxxxxxxxxxx>
  • To: techassist@xxxxxxxxxxxxx
  • Date: Thu, 02 Dec 2004 14:42:20 -0500

Try these: From techrepairCD:
RCA\CTC167\B+ regulation poor.  When set was off* the voltage on diodes 
CR4116\\\\Replacing R4144 repaired the set.\\\\\\\\
RCA\CTC167\INTERMITTENT SHUTDOWN\\\\REPLACE LEAKY C4107 IN POWER SUPPLY 
(NOTE: CHECKED 20 OHMS OUT OF CIRCUIT.\\\\\\\\
RCA\CTC167\PULSES ON & OFF\\\\REPLACE CR4902 ZENER DIODE IN HORIZONTAL 
CIRCUIT\\\\\\\\
RCA\CTC167\TV Pulses on and off at full line voltage.\\\\CR4902\\\\\\\\
RCA\CTC167R\BENDING OR POOR B+ REGULATION DURING SCEEN 
CHANGES\\\\REPLACE T4401\\\\\\\\
Phil Bader

Kevin wrote:

>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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-- 

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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