[TechAssist] Re: Sony KV32FS200 shut down instantly,5 blinks. tough FIX
- From: Jim Myers <jr.myers@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Thu, 28 Jul 2005 13:53:13 -0500
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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