[TechAssist] Re: Toshiba Projo Model TP55F81\TAC-9678 Chasis\in shutdn.
- From: "tvservice" <tvservice@xxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 15 Jun 2005 17:55:38 -0500
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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