[TechAssist] [Fwd: final FIX[Fwd: follow up Re: GE TVCR combi K50MVR08/ 13TVR01 SMPS squeels,fix.now blue screen.flashes]]

  • From: Phil Bader <philbad@xxxxxxxxxx>
  • To: "techassist@xxxxxxxxxxxxx" <techassist@xxxxxxxxxxxxx>
  • Date: Thu, 01 Nov 2001 06:33:20 -0500



-------- Original Message --------
Subject: final FIX[Fwd: follow up Re: GE TVCR combi K50MVR08/ 13TVR01
SMPS squeels,fix.now blue screen.flashes]
Date: Thu, 01 Nov 2001 06:32:00 -0500
From: Phil Bader <philbad@xxxxxxxxxx>
Organization: Jan Phyl TV Inc. Winter Haven, Fl.  Estab. 1976
To: "CONSUMERELREPAIR-L@xxxxxxxxxxxxxxxxxxxx"
<CONSUMERELREPAIR-L@xxxxxxxxxxxxxxxxxxxx>

After fixing the squeeling SMPS on the TV board by replacing cap C810
(470 mfd@16V) in primary ckt (see thread below for first post) Now the
pulsating picture. I opened the VCR and removed the plug-in VCR SMPS
module (typical Panasonic style) I ESR'd all caps. The only one that was
bad was the small 22 MFD Bi-Polor cap in the SMPS primary, next to the
SMPS transformer. I did not get location # but there is only one like it
in there. After final cap replacement and assembly,Ubit accepted a
tape,played, TV and tuner worked. All well. I could not find a +5V
source in the VCR SMPS block in the usual areas, but this unit does have
a seperate +5 and +12V source on the TV chassis that interconnects with
VCR, so that's what the VCR uses in this case I guess. Anyway it works!

-------- Original Message --------
Subject: follow up Re: GE TVCR combi K50MVR08/ 13TVR01 SMPS
squeels,fix.now blue screen.flashes
Date: Wed, 31 Oct 2001 09:42:17 -0500
From: Phil Bader <philbad@xxxxxxxxxx>
Organization: Jan Phyl TV Inc. Winter Haven, Fl.  Estab. 1976
To: Phil Bader <philbad@xxxxxxxxxx>
References: <3BE00CAE.A6D6C57A@xxxxxxxxxx>

With my hot air gun I forced hot air into the VCR section's SMPS block
and after 3 min. pix stayed on good. Probably those 5V reg.ckt. caps so
common in the Panasonic VCRs power supply blocks. Will troubleshoot
further.

Phil Bader wrote:
> 
> At first unit was totally unresponsive.The SMPS was making a squeel. The
> +5 and +12 volt reg. IC's had good stable output, but the +125V B+ to
> fly/HOT was running at +175V in stby. After replacing an open lytic in
> SMPS primary ckt,"C810" (470mfd@16V) the smps settled down and the HOT
> B+ was about 125V now. Push power,and after about 10 seconds it pulsed
> on/off repeatedly, cycling. The on time increases until it stayed on
> with the affore- mentioned voltages steady,HV steady but the slick blue
> screen went dark/light repeatedly cycling with a strange appearance.
> Tape in unresponsive.Push off,may ignore command. The "on" pulse from
> VCR to TV chassis connection pin 3 shows it comes and goes.Wondering if
> caps in VCR SMPS is fault. Seems like something is charging up,as it
> gets a little better with time. TIA, Phil
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  • » [TechAssist] [Fwd: final FIX[Fwd: follow up Re: GE TVCR combi K50MVR08/ 13TVR01 SMPS squeels,fix.now blue screen.flashes]]