[TechAssist] Re: Samsung TV, model TXJ2554 chassis K51A -black screen SAMS 4256

  • From: <tvservice@xxxxxxxxxxxxx>
  • To: <techassist@xxxxxxxxxxxxx>
  • Date: Fri, 31 Jan 2003 12:32:22 -0600

Our cost at Fox International is @ $65.00 US
Robert
tvservice@xxxxxxxxxxxxx
H & H Electronics Inc

----- Original Message -----
From: "Gary McCartney" <gary@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, January 31, 2003 11:05 AM
Subject: [TechAssist] Re: Samsung TV, model TXJ2554 chassis K51A -black
screen SAMS 4256


>
> Sorry, I don't have the schematic but another reply suggested that the
> flyback is bad because they've changed a few for the same symptoms. Now
> to convince my customer the set is worth a flyback. My local Samsung
> supplier wants $85.00 CDN for the flyback. Are there any US suppliers
> who have this item dirt cheap?
>
> Samsung part number: AA26-00057A
>
> number on flyback:  FUH-29A001
>
>
> Thanks,
>
>
>
> Gary McCartney
>
> McCartney Electronics
> 7134 Fife Rd, RR 7
> Guelph Ontario Canada N1H 6J4
> Fax: (519)821-1530
> email: gary (at) number63.ca
>
>
>
>
>
>
>
> Damon wrote:
> >
> > I get a feeling ( 8-0).....that your screen control is messing with your
> > cathode voltage. and this unit I believe has IK feedback.
> > Yeah your screen voltage is too low, isn't there a boosted supply tied
into
> > the screen control circuit on this? If so, check it. (You have
schematics,
> > right?) If not, then the IHVT will need replacement.
> >
> > Damon Brunger
> > Telrad Electronic Services
> > Ft Wayne, IN 46815
> > ----- Original Message -----
> > From: "Gary McCartney" <gary@xxxxxxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Thursday, January 30, 2003 2:32 PM
> > Subject: [TechAssist] Samsung TV, model TXJ2554 chassis K51A -black
screen
> > SAMS 4256
> >
> > >
> > > This is a Samsung TXJ2554 chassis K51A. (SAMS 4256)
> > > Turn set on, has sound but screen is black. Let it run and
> > > nothing changes usually, but one time the picture popped on normal all
> > > of a sudden. When turned on the next time, it had a black screen only
> > > again.
> > > I turned the screen control all the way up and the picture
> > > snapped in ok. Turned screen back down and the picture bloomed like
> > > crazy.
> > > It went really bright like it was saturated with too much contrast.
> > > Turned it back up to max. and picture was ok.
> > > Measured G2 on CRT board. Had an even voltage range but seems low-
went
> > > from 76V low end to 276V high end. Disconnected CRT board and G2
voltage
> > > acted the same. Then I changed the G2 disc capacitor on the CRT board
> > > (.01uF 3kv). That didn't make any difference. I think flyback should
put
> > > out around 500V on G2 at high
> > > end on most TVs, but it is only 276V. Is flyback defective?  Would The
> > > blooming be a sour tube? Why would it bloom  when I turn the screen
> > > down? Tapping on the tube neck doesn't make anything happen. R,G, B
> > > cathodes measure around 68Vdc with normal picture (seems low, ?). With
> > > blooming picture, I measure 33Vdc. With CRT socket removed, I read
> > > 191Vdc. The G1 pin measures approx. 0.4Vdc in any condition. So from
> > > these measurements it looks as if the CRT is drawing too much current.
> > >
> > >
> > > Do I have a bad flyback or CRT, or both?  Does anyone have a schematic
> > > with the dc voltages so I know if my readings are anywhere close to
> > > normal- which I don't believe they are?
> > > --
> > >
> > >
> > >
> > >
> > > Gary McCartney
> > >
> > > McCartney Electronics
> > > 7134 Fife Rd, RR 7
> > > Guelph Ontario Canada N1H 6J4
> > > Fax: (519)821-1530
> > > email: gary (at) number63.ca
> > >
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