[TechAssist] Re: Toshiba 50H72 TAC262 "dead" found F850 open...
- From: Phil Bader <tjanphyl@xxxxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Tue, 10 May 2005 10:18:48 -0400
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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