[TechAssist] Re: GE 31GT659 / CTC187CH +140V source @ +135V
- From: Phil Bader <philbad@xxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Wed, 30 Oct 2002 18:59:40 -0500
Since this was a borderline symptom and hard to see, it appears CR4403
cured it.The orig did have between 200k and 1 meg resistance of leakage
in ohms out of ckt.The new one did not.Thanks,all.
Phil Bader
armando guerra wrote:
>
> Keep in mind that anytime that a set is "blooming" ,it will affect your B+.If
> you
> have a .047/400v cap laying around,try it and see what happens.Other things
> that
> cause this problem would be a deffective new regulator.Is the the -40v right
> on
> at pin 1 of the reg?
> If the voltage is off by just 5volts,then check all of the folowing.
> CR4109= 7.5v zener.If leaky,will cause low B+.Also,check or replace
> C4127,c4124.
> C4105
> C4107
> C4109
> And make sure that you resolder the HOT heat sink tabs.
> Mando
> Birdie's TV & Electronics
> Casa Grande,AZ
>
> Phil Bader wrote:
>
> > These parts are scan parts.How would this explain the low B+ at the 140V
> > source at +135V while powered up?I could see these causing the narrow
> > scan issue when changing stations but the 135Volts?
> > Phil Bader
> >
> > armando guerra wrote:
> > >
> > > I am wondering if this problem wasn't there before the regulation
> > > problem.You may want to
> > > replace CR4403 and C4407.Replacing this parts may take care of the
> > > problem.
> > > Mando
> > > Birdie's TV & Electronics
> > > Casa Grande,AZ
> > >
> > > Phil Bader wrote:
> > >
> > > > Was dead,fuse open.Arc at AC input's spark gap indicating possible
> > > > storm. Replaced the 5A fuse and the suspicious U4101 STK730-150. POwers
> > > > up now with good picture/sound.
> > > > Only problem is when I change channels I notice the picture comes in
> > > > from sides a bit, like it is being loaded down. All seems to run cool.
> > > > I powered on the TV and measured the source#1 (+140VDC source) At
> > > > cathode of diode CR4106 and reads +135V.Low.Plugged in and in stand by
> > > > it measures +141.5VDC.I've seen this source run +146V normally before. I
> > > > changed the two caps at this source output, C4107 (100mf@250V) and C4105
> > > > (10mf@200V). No change.
> > > > Changed PS capC4107 (10mf@63V) off pin 1 of U4101.
> > > > No help.
> > > > What am I missing?
> > > > Phil Bader
> > > > --
> > > > Philip Bader
> > > > Jan Phyl TV Inc. (estab. 1976)
> > > > 3420 Recker Hwy. Winter Haven, Fl. 33880
> > > > Fax (863) 299-8821
> > > > email: philbad@xxxxxxxxxx
> > > >
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> > --
> > Philip Bader
> > Jan Phyl TV Inc. (estab. 1976)
> > 3420 Recker Hwy. Winter Haven, Fl. 33880
> > Fax (863) 299-8821
> > email: philbad@xxxxxxxxxx
> >
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--
Philip Bader
Jan Phyl TV Inc. (estab. 1976)
3420 Recker Hwy. Winter Haven, Fl. 33880
Fax (863) 299-8821
email: philbad@xxxxxxxxxx
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