[TechAssist] Re: Toshiba TP50F90 color intermittent
- From: becyn <becyn@xxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Fri, 25 Nov 2005 19:32:30 -0500
Well, then the question is which one of those very tiny holes is
the culpret.
In the case of a simple old fashioned double-sided, you might be able to
snake some
wire wrap gauge wire through the hole and solder both sides. That might
be OK if there's just a few.
However, on a multi- layer pcb there's no definitve way to "know" you've
sufficiently flowed the
contacts to the inner layers. Besides the holes on these scan converters
are about the diameter of a needle and they have a boat load of them.
IMHO it's better to just replace the module than to aggravate myself
with something that might or might not get fixed after all that effort.
Sorry...NO CAR , just an opinion from "Dr. Jim" ! ;-)
Jim McVey
McVey Alltronix
327 Broadway
Newburgh N.Y. 12550
"If it doesn't play...
CALL MCVEY !!!!!!"
Factory authorized
service for over 20
major brands.
845 561 8383
(Last of the Mohegans)
tjanphyl@xxxxxxxxxxxxxxx wrote:
>OK. Now: since I am showing my ignorance here I might as well go for
>the car, behind door #2!
>How exactly does a hole "go bad"? You mean poor solder flow thru them?
>Reflow solder is the fix?
>Phil
>
>Phil Bader, Pres.
>Jan Phyl TV Inc
>Winter Haven, Fl
>(863) 299-8821
>Confounding the wise since 1976
>personal email: pbader@xxxxxxxxxxxxxxx
>
>----- Original Message -----
>From: becyn <becyn@xxxxxxxxxx>
>Date: Friday, November 25, 2005 5:16 pm
>Subject: [TechAssist] Re: Toshiba TP50F90 color intermittent
>
>
>
>>You know, 'through holes" to make connections on multi-layered and
>>double sided boards?
>>"Via" is the pcb industry "politically correct" term for the things.
>>
>>Jim McVey
>>McVey Alltronix
>>327 Broadway
>>Newburgh N.Y. 12550
>>
>>"If it doesn't play...
>>CALL MCVEY !!!!!!"
>>Factory authorized
>>service for over 20
>>major brands.
>>845 561 8383
>>(Last of the Mohegans)
>>
>>tjanphyl@xxxxxxxxxxxxxxx wrote:
>>
>>
>>
>>>have bad via's ????
>>>Phil
>>>
>>>Phil Bader, Pres.
>>>Jan Phyl TV Inc
>>>Winter Haven, Fl
>>>(863) 299-8821
>>>Confounding the wise since 1976
>>>personal email: pbader@xxxxxxxxxxxxxxx
>>>
>>>----- Original Message -----
>>>From: becyn <becyn@xxxxxxxxxx>
>>>Date: Friday, November 25, 2005 1:46 pm
>>>Subject: [TechAssist] Re: Toshiba TP50F90 color intermittent
>>>
>>>
>>>
>>>
>>>
>>>>Yes, Toshiba's "hyper or scan converter pcb's have been dropping
>>>>like
>>>>flies lately around here.
>>>>Some of them seem to have bad via's which are sensitive to
>>>>tapping, or
>>>>twisting the can slightly.
>>>>
>>>>Jim McVey
>>>>McVey Alltronix
>>>>327 Broadway
>>>>Newburgh N.Y. 12550
>>>>
>>>>"If it doesn't play...
>>>>CALL MCVEY !!!!!!"
>>>>Factory authorized
>>>>service for over 20
>>>>major brands.
>>>>845 561 8383
>>>>(Last of the Mohegans)
>>>>
>>>>Carol Rundle wrote:
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>>If your model has standup shielded module( hyper brd.) just
>>>>>
>>>>>
>>>>>
>>>>>
>>>>behind A/V jack panel, try a little freeze, and heat, inside
>>>>module. if it simulates your symtoms, remove brd., ESR lytics
>>>>
>>>>
>>,
>>
>>
>>>> I've repaired several Toshiba hyper brd's, found
>>>>weak,leaky smd lytics, usually find several (8-10)weak,leaky !
>>>>Causing symtom's similar to your 's.. hth
>>>>
>>>>
>>>>
>>>>
>>>>>Bill
>>>>>Bill'sTV
>>>>> Sonora,Calif.
>>>>>
>>>>>
>>>>>Ian Scott <service.depot@xxxxxxxxxxx> wrote:Hello, This set is
>>>>>
>>>>>
>>in
>>
>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>the customer's home and intermittently loses
>>>>
>>>>
>>>>
>>>>
>>>>>color. When there is no color, the black and white picture has
>>>>>
>>>>>
>>a
>>
>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>noise>in it that appears like you're looking through a screen
>>>>door. Both the
>>>>
>>>>
>>>>
>>>>
>>>>>main picture and PIP will lose color. When I remove the rear
>>>>>
>>>>>
>>>>>
>>>>>
>>>>cover to
>>>>
>>>>
>>>>
>>>>
>>>>>work on it, after 10 minutes or so the problem won't occur
>>>>>
>>>>>
>>>>>
>>>>>
>>>>anymore. I
>>>>
>>>>
>>>>
>>>>
>>>>>have tried to heat up the pc boards with a hair dryer, but the
>>>>>
>>>>>
>>>>>
>>>>>
>>>>symptom>won't return (until I leave). I suspect the comb filter.
>>>>
>>>>
>>>>
>>>>
>>>>>The customer normally watches digital cable and he has had the
>>>>>
>>>>>
>>>>>
>>>>>
>>>>cable box
>>>>
>>>>
>>>>
>>>>
>>>>>replaced. I have asked the customer to try using his DVD to see
>>>>>
>>>>>
>>>>>
>>>>>
>>>>if it
>>>>
>>>>
>>>>
>>>>
>>>>>loses color as well, but so far the results are inconclusive.
>>>>>Thanks in advance for any help.
>>>>>Ian Scott
>>>>>Service Depot
>>>>>252 Lasalle Blvd.
>>>>>Sudbury, ON
>>>>>P3A 1W6
>>>>>705-566-3557
>>>>>Fax 705-566-3455
>>>>>
>>>>>
>>>>>----------------------------------------------------------------
>>>>>
>>>>>
>>--
>>
>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>-----------
>>>>
>>>>
>>>>
>>>>
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