[TechAssist] Re: Panasonic CT27G20T chassis AEDP246 series NA3D No Vertical
- From: "repair1" <repair1@xxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 23 Oct 2003 10:50:09 -0500
three possibilities are: defective jugle ic or peripheral component in
drive line, a broken trace, those sets are very bad about pad seperating
from foil and looks fine, and third, you could possibly have a defective
vert chip, I recently replaced the audio out in a toshiba (was a ta8200h),
the original was shorted, new ic drew virtually no current, output pins
were nearly o instead of 12v,(these are usually collector voltages of
internal transistors), chip was "open", hth.
charles betzler
Best Electronics
repair1@xxxxxxxxxxxxx
----- Original Message -----
From: <tvservice@xxxxxxxxxxxxx>
To: "Tech-Assist" <techassist@xxxxxxxxxxxxx>
Sent: Thursday, October 23, 2003 9:51 AM
Subject: [TechAssist] Panasonic CT27G20T chassis AEDP246 series NA3D No
Vertical
> 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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