[TechAssist] Re: Toshiba 50H72 TAC262 "dead" found F850 open...

  • From: "tvservice" <tvservice@xxxxxxxxxxxxx>
  • To: <techassist@xxxxxxxxxxxxx>
  • Date: Tue, 10 May 2005 12:00:28 -0500

To do the mentioned repair we would get $520-550 including service call,
shop labor and parts.
Robert
tvservice@xxxxxxxxxxxxx
H & H Electronics Inc

----- Original Message ----- 
From: "Phil Bader" <tjanphyl@xxxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Tuesday, May 10, 2005 9:18 AM
Subject: [TechAssist] Re: Toshiba 50H72 TAC262 "dead" found F850 open...


> I printed out your response. I guess I'm overly careful, but with these
> HDTVs I usually don't just replace a blown fuse and see what happens. I
> like to thoroughly research the sym-cures beforehand. I search the
> database regarding anything referring to a blown F850 5A.
> Paranoid I know...
> I was thinking of testing the mentioned bridge,etc.if OK, figure a pair
> of STK conv. ICs, resolder conv. board completely, solder the
> interconnection
>  jumpers that couple between defl. and conv. boards. Do you think this
> sounds logical? Now I need to arrive at a $$$ figure to quote...
> Phil Bader
>
> Philip Bader
> Jan Phyl TV Inc. (estab. 1976)
> 3420 Recker Hwy. Winter Haven, Fl. 33880
> Fax (863) 299-8821
> email: tjanphyl@xxxxxxxxxxxxxxx
>
>
>
> tvservice wrote:
>
> >Phil
> >Is this fuse blowing at power on and appears no short or load on the
line?
> >If so look at this:
> >50H71 (any H line with STK's on signal board)
> >Convergence problems with shutdown and blown fuses
> >CAREFULLY INSPECT AND RESOLDER SMALL BLACK or BROWN JUMPERS ON TOP OF
BOARD
> >NEAR STK's
> >May cause intermittent convergence problems or shutdown
> >Also check low value resistors 1.8 ohm 1 watt for increase value
> >If D851 bridge is bad replace only with Toshiba #23357215/D4SBS6 special
> >fast switching
> >
> >Robert
> >tvservice@xxxxxxxxxxxxx
> >H & H Electronics Inc
> >
> >----- Original Message ----- 
> >From: "Phil Bader" <tjanphyl@xxxxxxxxxxxxxxx>
> >To: <techassist@xxxxxxxxxxxxx>
> >Sent: Monday, May 09, 2005 12:55 PM
> >Subject: [TechAssist] Re: Toshiba 50H72 TAC262 "dead" found F850 open...
> >
> >
> >
> >
> >>Someone pointed out this F850 fuses the +16 volt source that goes to the
> >>12 volt regulator on the converg. board, and check it's output
> >>resistance for shorts.
> >>This must not be a common issue, as the only tech hits I got so far were
> >>two answers, and both were on the other TV-repair yahoo group I'm also
> >>with. Will try to keep advised.
> >>Phil Bader
> >>
> >>Philip Bader
> >>Jan Phyl TV Inc. (estab. 1976)
> >>3420 Recker Hwy. Winter Haven, Fl. 33880
> >>Fax (863) 299-8821
> >>email: tjanphyl@xxxxxxxxxxxxxxx
> >>
> >>
> >>
> >>Phil Bader wrote:
> >>
> >>
> >>
> >>>I did a search in my email database for "Toshiba" + "F850".
> >>>Most of the hits were not my exact model, but similar,in that they had
> >>>F850 open. I take it  F850 aparently is in one of the convergence power
> >>>supplies.General consensus is this fuse opens from bad solder on
jumpers
> >>>on the convergence board (many) and/or bad converg. ICs (uses a pair of
> >>>STK392-110). Some techs got away with fuse changing and board jumper
> >>>resoldering, others, the STK's as well were needed.
> >>>Anything specific to my model with an open 5 amp  F850 (SOC 5A pico
> >>>
> >>>
> >fuse)??
> >
> >
> >>>Thanks,
> >>>Phil Bader
> >>>
> >>>
> >>>
> >>>
> >>>
>
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