[TechAssist] Re: Panasonic CT27G20T chassis AEDP246 series NA3D No Vertical

  • From: <tvservice@xxxxxxxxxxxxx>
  • To: <techassist@xxxxxxxxxxxxx>
  • Date: Thu, 23 Oct 2003 14:12:56 -0500

Dominic,
I did check input waveform as listed on  Pin 2   4.4 volt   with .3vpp 5ms
input should be 4.4vpp (suspect low caused by  IC451 not working) or maybe
IC101 jungle bad??
have tried 2 different LA7836 and thoroughly washed area with acetone.
Have painstakenly check continuity on all traces
I am ordering jungle chip AN5163K reluctantly cause have never seen one bad

Robert
tvservice@xxxxxxxxxxxxx
H & H Electronics Inc
Dallas, TX

----- Original Message ----- 
From: <MDileo0000@xxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Thursday, October 23, 2003 1:28 PM
Subject: [TechAssist] Re: Panasonic CT27G20T chassis AEDP246 series NA3D No
Vertical


> Robert,
>
> You made no mention, but are you receiving a vertical pulse to IC451?
Using a
> scope? I know it is very difficult to see because of the dark masking and
> overlay, but look for broken pads and cracked traces at IC451. I wash the
area
> with acetone to clean away the flux residue to see things better.
>
> Dominic DiLeo
> Atlantic TV
> Freeport, Maine
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> n a message dated 10/23/03 1:49:10 PM Eastern Daylight Time,
> tvservice@xxxxxxxxxxxxx writes:
>
> > OK Group
> >  Please tell me what I am NOT doing
> >  This set came from another shop with no vertical deflection
> >  Have relaced...
> >  IC451   LA7836
> >  D451    NTE552
> >  D557    5.1 volt zener
> >  D545    12 volt zener
> >  C451  220mfd
> >  C455  100mfd
> >  C457  .1mfd
> >  C453   2.2mfd
> >  C452    1mfd
> >  All resistors are within tolerance. IC451 voltages are...
> >  Pin 1   +12.3 volt  VCC1
> >  Pin 2   4.4 volt   with .3v 5ms input should be 4.4v (suspect low
caused by
> >  IC not working) or maybe IC101 jungle bad??
> >  Pin 3   6 volt  (size)
> >  Pin 4   gnd
> >  Pin 5   11 volt schem says 6 volt   (ramp gen)
> >  Pin 6   .3 volt schem says 6.5 v  (drive/feedback)
> >  Pin 7   +26 volt   VCC2
> >  Pin 8   0  schem says 2.6 v   (pump up)
> >  Pin 9   n/c 2.7v
> >  Pin10  gnd
> >  Pin11  .5 volt schem says 15.4 v (output)
> >  Pin12   26 volt
> >  Pin13   5.1 volt
> >  Have also subbed yoke
> >  still no Vertical deflection
> >
> >  Please any advice appreciated
> >
> >  Robert
> >  tvservice@xxxxxxxxxxxxx
> >  H & H Electronics Inc
> >  Dallas, TX
> >
>
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