[TechAssist] Re: Sony KV-27S46(Chassis BA-4D) picture a little narrow and non linear
- From: tjanphyl@xxxxxxxxxxxxxxx
- To: techassist@xxxxxxxxxxxxx
- Date: Fri, 21 Oct 2005 22:11:59 -0400
Dale, I have no model-specific tips, but from what you say, the
picture is non-linear horizontally,judging from the distortion in the
cross hatch.(you could see this on your O'scope)As it gets to the
right side, it worstens.This would relate maybe to the drive eaveform
being irregular. The HOT overheating,would indicate to me perhaps the
duty cycle of the drive is off,causing the on time of the HOT biasing
to be more than normal,hence it runs hot. I would think this is the
original problem that destroyed the HOT to begin with. Look at the
scan/sweep capacitors in the HOT collector circuit.I would also locate
the electrolytic connected to the horiz. drive transformer.usually
they are around 1uf to 2.2uf at 160-250 volts.Their ESR usually
increases,or they lose value. Other defects could cause your symptom,
but I would address the ones I mentioned first. Good luck. BTW do you
have a diagram?
Let me know.
Best,
Phil
Phil Bader, Pres.
Jan Phyl TV Inc
Winter Haven, Fl
(863) 299-8821
estab. 1976
personal email: pbader@xxxxxxxxxxxxxxx
----- Original Message -----
From: Dale Lubow <harristv@xxxxxxxxx>
Date: Friday, October 21, 2005 6:35 pm
Subject: [TechAssist] Sony KV-27S46(Chassis BA-4D) picture a little
narrow and non linear
> I have a Sony KV27S46 that came in with a bad H.O.T. (2SC5426).
> Replace it
> the picture came back. I noticed with a crosshatch pattern that the
> horizontal sweep is not linear and a little narrow. It is normal
> at the left
> edge but as it scan to the right side my squares get narrower. The
> B+ is
> 135V(normal). The H.output does get pretty hot(145 degrees) after
> awhile.the service adjustments only has a horizontal size which
> will make the
> picture wider but does nothing for the non linearity. Does anyone
> have any
> ideas before I spend hours checking all the wave shaping parts in the
> deflection circuit?
> TIA,
> Dale
> --
> Dale A. Lubow CET
> Harris TV & Appliance
> 335 Lincoln Way
> Ames, IA 50010
> 515-232-1109 (Voice)
> 515-232-3356 (Fax)
> HarrisTV@xxxxxxxxx
>
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