[TechAssist] Re: Toshiba TP55G65,TAC 9754, HV comes on for split second, need SM.

From: "Damon" <damon101@xxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Date: Tue, 12 Apr 2005 20:03:14 -0500
I don't like the word swap.....sounds like you moved the bad ic into the
good ic slot and vice versa.
I Ass-u-me you meant you replaced the bad one with a new (hopefully original
from manufacturer) one, right?

Did you check all resistors? Open resistors on the yoke's output lines will
kill the video too.
If it's still giving you shutdown, then the next likely culprit would be a
bad signal from the convergence generator circuit.
Since I don't have the schematics in front of my face, I'll assume this is a
Digital Convergence module, soldered upright and mid-board on the left-most
board normally having the standby power/AC line input configuration on
it.....pretty popular layout for the D series....or is this the one where
the left-most board has a board on top of it, and both are power
supply-related?

Either case, you can scope the RV/RH , GV/GH and BV/BH signals off of the
digital convergence board and see if the DC is at 0V, out in the field a
quick test is to set the cross hairs for mid-center and see if the DC is at
0V  + or - 150mV using your DC meter.....now that's the Digital generator's
output (or the convergence amp's input).....that's normal for this. Anything
outside of +- 150mV is too much DC.
I like Jim Myers test too, since you can actually see the bad signal on the
TV set.
I don't believe your yokes are bad, I believe you're sending a bad signal
that forces the set into shutdown.

Damon Brunger
Telrad Electronics
Fort Wayne IN
----- Original Message -----
From: "Kevin" <kevintv@xxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Tuesday, April 12, 2005 5:30 PM
Subject: [TechAssist] Re: Toshiba TP55G65,TAC 9754, HV comes on for split
second, need SM.


> I just swapped the convergence IC's with no change, which leads me to
> believe that they are fine.  But, I don't have the schematic to confirm
> that swapping them is a good test to see if they are bad or not .
>
> Kevin Wilks
> Kevin's TV & Video Repair
> Penticton BC Canada
> kevintv@xxxxxxx
>
>
> -----Original Message-----
> From: techassist-bounce@xxxxxxxxxxxxx
> [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Corey Brazell -
> Audio Video Electronics
> Sent: Tuesday, April 12, 2005 2:34 PM
> To: techassist@xxxxxxxxxxxxx
> Subject: [TechAssist] Re: Toshiba TP55G65,TAC 9754, HV comes on for
> split second, need SM.
>
> That proves 100% that you have a bad STK convergence output IC!
>
> Corey Brazell
> Audio Video Electronics
> 12169 SC Hwy 121
> Newberry SC 29108
> ----- Original Message -----
> From: "Kevin" <kevintv@xxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Tuesday, April 12, 2005 5:13 PM
> Subject: [TechAssist] Re: Toshiba TP55G65,TAC 9754, HV comes on for
> split
> second, need SM.
>
>
> >I pulled the convergence yoke plugs one at a time and the set comes on
> > and stays on with the green convergence yoke plug removed.  Does this
> > prove 100% that the green convergence yoke is bad, or do I need to do
> > more testing to confirm this diagnosis?  All the convergence yokes
> rang
> > the same on my Sencore LC75, so I am suspicious that the green
> > convergence yoke is at fault.  Thanks.
> >
> > Kevin Wilks
> > Kevin's TV & Video Repair
> > Penticton BC Canada
> > kevintv@xxxxxxx
> >
> >
> > -----Original Message-----
> > From: techassist-bounce@xxxxxxxxxxxxx
> > [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Kevin
> > Sent: Sunday, April 10, 2005 1:55 PM
> > To: TECH-ASSIST
> > Subject: [TechAssist] Toshiba TP55G65,TAC 9754, HV comes on for split
> > second, need SM.
> >
> > This set comes on for a split second and then goes into shutdown with
> > the power light slowly flashing off and on.  I looked in the member's
> > area but could not find this model listed.  Does anyone know what
> > chassis family this set belongs to?  I am guessing it is in the list
> for
> > Toshiba, but not by model number.  Thanks.
> >
> > Kevin Wilks
> > Kevin's TV & Video Repair
> > Penticton BC Canada
> > kevintv@xxxxxxx
> >
> >
> >
> >
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References:
- [TechAssist] Re: Toshiba TP55G65,TAC 9754, HV comes on for split second, need SM.
  - From: Kevin
[TechAssist] Re: Toshiba TP55G65,TAC 9754, HV comes on for split second, need SM.

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