[TechAssist] Re: Magnavox TV, 20MS233S, No Audio
- From: "Gemini Computer & TV" <geminitv@xxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 19 Feb 2004 18:21:04 -0500
You have a defective IC (ref# 7000). Here is the scoop:
Symptom: No sound or low sound on tuner, OK on AV input. IC 7000 ( 9322 152
70671) has failed.
Cause: Electrical Over Stress of IC from CRT arc due to lead dress.
Resolution: Dress black wire from 0227 on chassis to 0227 on Stereo CBA away
from black wire that grounds CRT dag coating. Also dress 0227 wire away
from CRT. This is very important to avoid future failures.
Applies To:
20J8, 20MS233S
Symptom: SOUND ONLY ON AV INPUT
Cause: IC 7000 (signal processor) on the main CBA
Resolution: Replace with Part Number 9322 152 70671.
Applies To: 13J8, 13MT143S, 13MT143S99, 13PR20C121, 19J8, 19PR21C121,
19PR21C122, 19PR21C125, 19PR21C222, 19PS57C121, 19PS57C125, 20J8, 20MS233S,
20MS233S99, 20MT133S, 20MT133S99, PR1306C121, PR1320C121, PR1392X121,
PR1906C121, PR1906C122, PR1906C125, PR1921C121, PR1921C125, PS1947C121,
PS1947C125
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@xxxxxxxxxxxxxxxx
geminitv@xxxxxxx
www.geminicomputertvsecurityalarms.com
----- Original Message -----
From: <gulftech@xxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Thursday, February 19, 2004 5:53 PM
Subject: [TechAssist] Magnavox TV, 20MS233S, No Audio
> Set manufactured April, 2003. Can find no chassis number.
>
> Has no audio. No Sams listed for this model. Uses a TDA7053A for audio
> output. I think the circuit reference is 7800. (I really hate the
> numbering system.) The chip runs cold. Several pins have about 5v; p5
> has about 11v. I find no audio present on any leg of the IC.
>
> Does anyone have a pdf file of this set or suggestions?
>
> TIA,
>
>
> Ken Smith
> Gulf Technical Services
> 3034 Gulf Breeze Parkway
> Gulf Breeze, FL 32563
> 850-934-8324 (Voice) 850-932-0819 (Fax)
>
>
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