[TechAssist] Re: Toshiba Projo Model TP55F81\TAC-9678 Chasis\in shutdn.
- From: armando guerra <birdie@xxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Wed, 15 Jun 2005 15:18:42 -0700
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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