[TechAssist] Re: RCA Proscan PS27115, Chassis CTC197BC. Intermittent loss of audio, just a pop sound when channels change?

  • From: peggs <peggs@xxxxxxxxxxxxx>
  • To: techassist@xxxxxxxxxxxxx, <techassist@xxxxxxxxxxxxx>
  • Date: Mon, 31 Oct 2005 11:05:03 -0800

I had a customer drop by this morning asking about a 27" RCA,CTC197.
His sound drops out as well.
I've heard of many instance of Cable Signals causing Audio Drop-outs,but he 
said he is on Antenna Only.
WinStips has a few tips,
(1) Replace C11611 (10uf/16v) C11604 (3.3uf/50v) C11623 (4.7uf Or 10uf 
Varies By Chassis)
All High Esr
(2) Problem Wound Up Being On The Little Stand Up Board Beside The Stereo 
Decoder Ic. I Think That This Is The Srs Board. It Had A Poor Solder 
Connection On The Socket That Plugs Into The
Main Pcb.
(3) Cracked Solder Connections On Braces Of The Small Shield On Bottom Of 
Main Pc Board. Also Check Pins On Flyback & Focus/Screen Controls.
(4) Replaced U1600 // Pn 237930
Also C12304 And Cr12301.

Peggs

At 08:43 AM 10/31/05, Robinson Electronics wrote:
>Can any of you Techs. when with some info on this problem? Are there any 
>cure from Thomson on this?
>The customer said he was watching TV and the audio just quit, but would 
>make a pop sound when the channels were changed.
>I checked the set out, plugged it in and the sound is great, no problem found.
>I changed out some caps in the audion circuit in case of low esr, checked 
>ok though:
>C11601, 11604, 11611, 11623, 11628, 11907.
>I checked the audio output TDA7499, not getting hot, checks ok.
>Played for about a hour, called the customer to pick up.
>The customer said it played good for about 2.5 hrs. then quit after a 
>commercail came on, now just a pop sound when channels change. looks like 
>after unplugged for a while, it resets and the sound is good.
>I saw some notes indicating Q11900 "mute xstr" as a common audio problem!
>
>Has anyone seen this, found a cause or cure for it?
>Can anyone help us with this? Any info appreciated.
>Thanks.         David.
>
>Robinson Electronics
>1075 Sweeten Creek Road #51
>Asheville, NC 28803-1757
>Ph./Fax. 828  274-3787
>Toll Free. 1-888 ROBELECT
>www.robinsonelectronics.com
>www.robelect.com
>Mailto: RobinsonElectronics@xxxxxxxxxxx
>
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