[TechAssist] Re: Sony KV32FS200 shut down instantly,5 blinks. tough FIX
- From: "Leonard Caillouet" <lcaillo@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 28 Jul 2005 15:31:06 -0400
I jsut had an older Sony KV36FS13 that would flash 5 times in standby and
when on. The CRT was on and the only problem was that the video level to the
CRT drive IC was to high. The set was to bright but worked fine otherwise,
even looked OK if you turned the brightness down. The problem was one of
the IK buffers. Replaced that transistor and the set was normal. I think
that the micro assumes IK failure if it never gets the right feedback from
the jungle chip, so if the CRT never comes up and no other codes are thrown,
it goes to 5 flashes.
FWIW, this set was one that was struck by lightning and I sent the board to
Tri-State fro rebuild. It came back working except for this problem. They
had me send in the PS and AV boards to test it and the PS came back with a
crack in it that I had to repair. I keep trying to give them chances, but I
am just about fed up. I have received three boards from them that I had to
finish fixing before I could complete the repairs. One Zenith, one Philips,
one Sony. I'll be talking to them about this one.
Leonard Caillouet
Electronics World
1261 NW 76 Blvd
Gainesville, FL 32606
352-332-5608
352-332-5668 fax
----- Original Message -----
From: "Jim Myers" <jr.myers@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Thursday, July 28, 2005 2:53 PM
Subject: [TechAssist] Re: Sony KV32FS200 shut down instantly,5 blinks. tough
FIX
Hard to believe that Sony was stumped by the 5 blinks since that is the
IK failure code. Anything that causes the CRT to not develop a raster
can give a 5 blink error code and it is often a false error code.
Good find anyway, hope it makes the web site list.
********************************
Since 1972 *
Jim Myers *
Telrad Electronics *
Fort Wayne Indiana *
********************************
Phil Bader wrote:
> This is from a local ASC here I know.Even Sony was at a loss.This fix ,
> Sony says,will appear on their web site.
> Came in dead.Power surge or lightning suspected by tech.Customer said
> "no".
> Power it on, hear the HV come up, all secondary voltages seemed there,
> instantly shut down with 5 blinks.All happened in an instant.
> Sony said 5 blinks was a signal loss issue, suggested a ton of
> possibilities which he tried. None helped.
> Replaced flyback,micro,jungle,etc, then finally the entire "A" board
> itself these parts lived on.That's the main chassis. No help. The SMPS
> "GK" board seemed to be OK. Then he swapped the power supply GK board
> into another Sony and the trouble followed that board!
> SD happened too quick to trace with meter, so out comes the trusty
> O'Scope.
> Set to "DC" the tech looked at each and every voltage source at turn on.
> The only unusual source was the +7.5 volt source coming out of the
> SMPS,went to over +8 volts. He traced that line back to a tiny small SMD
> diode on the underneath of the power supply:
> D620. (he pulled one off another chassis). It was open.
> 'Replacement of this SMD diode D620 cured the problem.
> Sony was stumped why 5 blinks...
> Phil Bader
>
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