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

From: "Terry J Hutchison" <sony1@xxxxxxxx>
To: techassist@xxxxxxxxxxxxx
Date: Mon, 31 Oct 2005 11:58:25 -0500

Been a while since I worked on that chasis for that problem but I seem to
recall it was very similar to the older 177 chasis, the eeprom becomes
corrupted and caused low or no audio.  Believe the eeprom for that chasis
was a kit with the large processor being changed at the same time.  If you
have a old chasis laying around try subbing out the eeprom.  Sorry so
vague.  Terry

Terry J Hutchison
T&G TV Repair
Kingsland GA.
sony1@xxxxxxxx


> [Original Message]
> From: Robinson Electronics <RobinsonElectronics@xxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Date: 10/31/05 11:43:44 AM
> Subject: [TechAssist] RCA Proscan PS27115, Chassis  CTC197BC.
Intermittent loss of audio, just a pop sound when channels change?
>
> 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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[TechAssist] Re: RCA Proscan PS27115, Chassis CTC197BC. Intermittent loss of audio, just a pop sound when channels change?

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