[TechAssist] Re: Toshiba Projo Model TP55F81\TAC-9678 Chasis\in shutdn.
- From: Jorge Camboni <geo@xxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Sat, 18 Jun 2005 02:54:35 -0500
There is a small daughter board just in front or behind the LA 7833 (do not
remember exactly),
the vertical drive comes from it, you very often find the connector's pins
on the small board
badly soldered, with circular cracks and the like. Try resoldering, have
found them causing
shutdown several times.
buena suerte
Jorge
At 08:06 p.m. 16/06/2005 -0700, you wrote:
>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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Jorge Camboni, GY Electronics, Richardson, TX
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