[TechAssist] Re: Toshiba TP50F90 color intermittent
- From: tjanphyl@xxxxxxxxxxxxxxx
- To: techassist@xxxxxxxxxxxxx
- Date: Fri, 25 Nov 2005 20:13:20 -0500
Understood now.
In the case of many-layered boards, these internal layers only have
connecting traces,not any components in between I assume.It is to
allow for more wire density without more surface area boards.
I see. If they needed 400 traces to wire a PCB, it is more compact
to ,say, have 8 layers with 50 traces= the 400 needed instead of a
board many times larger.
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 7:32 pm
Subject: [TechAssist] Re: Toshiba TP50F90 color intermittent
> 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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> >>>>>brundle@xxxxxxxxxxxxx
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