[TechAssist] Re: Toshiba Projo Model TP55F81\TAC-9678 Chasis\in shutdn.
- From: armando guerra <birdie@xxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Thu, 16 Jun 2005 20:06:52 -0700
I had a good used dpc module that I had tried but still went into shutdn.As for
the yoke or pix tube,I have disconnected the crt bd and yoke from each of the
crts one at a time to see if eighter one was causing the problem but the tv will
still shut dn.Will keep hunting and will post if I have any good news. Thanks
Mando
Birdie's TV & Electronics
Casa Grande, AZ
tvservice wrote:
> Mando
> pull the dpc module out and look for open resistor and leaky protect
> transistor
> you should see where it overheated
> This model also has a history with me anyway of bad yokes mostly the blue
> and/or broken blue crt
> Robert
> tvservice@xxxxxxxxxxxxx
> H & H Electronics Inc
>
> ----- Original Message -----
> From: "armando guerra" <birdie@xxxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Wednesday, June 15, 2005 5:18 PM
> Subject: [TechAssist] Re: Toshiba Projo Model TP55F81\TAC-9678 Chasis\in
> shutdn.
>
> > Hello Bob.I had the origional Toshiba's STK-392-110 in stock and tried
> them but I
> > still have the shutdn problem.I know that this sets have a big history of
> this
> > ic's causing shutdn but from my exp.on this sets,if the problem is in the
> > convergence ic's,the set will power up by disconnecting connector P712 and
> fuse
> > F850 from the power\conv.bd.The picture will be pretty well off alignment
> as far
> > as convergence but it will come on.I think I'll leave it alone till the
> morning
> > when I won't be too tired of it and will try to figure it out.I even tried
> a new
> > Q801 (Reg.) in the high voltage\sweep bd but no luck.I also removed
> > F470,installed a 60w bulb in its place to check and see if it was
> regulating at
> > 125v and its at 124.5v.I am stunned.Since I am not an ASC for toshiba,I
> cannot
> > get in the website to see any troubleshooting flow charts or tips.Thanks .
> > Mando
> > Birdie's TV & Electronics
> > Casa GRande, AZ
> >
> > Gemini Computer & TV wrote:
> >
> > > I am 99.9 % certain that if you replace the convergence ICs, your set
> will
> > > be fixed ( I realize it may not be exhibiting any convergence type
> symptoms
> > > but you just have to trust me on this one). That set uses STK392-110 but
> I
> > > would use good quality STK392-150 or STK392-180 as replacements (higher
> > > power ratings aand far more reliable).
> > >
> > > Bob Waterman, CET® #RI-28
> > > Master Technician License #9109
> > > Service Manager / Parts Manager
> > > Gemini Computer, TV, & Security Alarms
> > > (508)695-7302
> > > (508)695-7769 FAX
> > > geminitv@xxxxxxxxxxx
> > >
> > > ----- Original Message -----
> > > From: "armando guerra" <birdie@xxxxxxxxxxxxx>
> > > To: <techassist@xxxxxxxxxxxxx>
> > > Sent: Wednesday, June 15, 2005 2:35 PM
> > > Subject: [TechAssist] Toshiba Projo Model TP55F81\TAC-9678 Chasis\in
> shutdn.
> > >
> > > I am hoping that someone can give me their opinion on this problem .At
> > > power up,high voltage comes up for a few sec.and then the tv shutsdn.Led
> > > is blinking.To isolate the convergence ic's,I removed connector P712 and
> > > F850 from the conv.\power bd and it still shutdn.I even removed the
> > > conv.yokes from that bd and no go.Now,I removed all 3 crt bds,one at a
> > > time with their respective yokes and still went into shutdn,so the crts
> > > are not the problem.I replaced the vertical ic LA7833 since it can cause
> > > shutdn but did not help.I unsoldered the audio ic LA4282 to see if that
> > > was the cause and still no luck.Here is the only hint.No matter what
> > > yoke (not convergence)I remove and fire the tv up,the high voltage comes
> > > up and stay's there,will not shut dn.However,there is no pix or sound.At
> > > first,I tought it was that particular yoke as I removed the conn but the
> > > high voltage stay's up,no matter which of the 3 yokes I disconnect.I am
> > > running out of idea's and my hair is getting whiter so I hope that
> > > someone can help. Thanks for your help.
> > > Mando
> > > Birdie's TV & Electronics
> > > Casa GRande,AZ
> > >
> >
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