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

  • From: "Robinson Electronics" <RobinsonElectronics@xxxxxxxxxxx>
  • To: <techassist@xxxxxxxxxxxxx>
  • Date: Mon, 31 Oct 2005 11:43:29 -0500

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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