[TechAssist] Re: Fixed: Magnavox 27a5 rolls
- From: "Edward Gaidies" <teltek2@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Fri, 22 Nov 2002 10:24:54 -0500
Wayne;
If this would have been a Mits, first thing that I would point to. PIP.
-Ed-
----- Original Message -----
From: "Wayne Vanaman" <Wayne@xxxxxxxxxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, November 22, 2002 9:17 AM
Subject: [TechAssist] Fixed: Magnavox 27a5 rolls
>
> Greetings all:
>
> TV
> Model: Magnavox cp4764a401
> Chassis: 27a502-00aa
>
> Symptom:
> Rolls vertically, any input. OSD is stable
>
> Fix:
> C200 on the PIP board.
>
> The gruesome details:
>
> Changed jungle IC200 LA7672, no help.
> Changed the vertical IC, LA7838 (just cause I had one).
>
> Sync the scope on field one of the jungle ic video det output pin, P44.
> Scope pin 28, vertical output, and watch it roll. Back to IC200p29 and
the
> signal is in sync.
>
> Curiously the set will sync if I input a green field.
>
> Voltages measured very close to those in the manual (SAMs 3534)
> Finally I realized that the Amplitude of the input at ic200p29 was low,
and
> tracked it back to the PIP module.
>
> Because the LA7672 jungle IC is used in other sets this could be a problem
> for them also.
>
>
> Wayne Vanaman
> Omega Electronics
> 6904 W Fairfield Dr
> Pensacola, FL 32506-3310
>
> 850-456-5995 voice
> 850-458-6369 fax
>
> Wayne@xxxxxxxxxxxxxxxxxxxxx
> www.PensacolaTVRepair.Com
>
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