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

  • From: "John Conti" <contitv@xxxxxxxxxxx>
  • To: techassist@xxxxxxxxxxxxx
  • Date: Mon, 31 Oct 2005 12:03:33 -0600

David, here,s a bullitin on looses pix and sound

Looses pix and sound once a week or several times a day. (Or wide noise 
bands in the picture, and static crashes in the audio after it plays 
awhile). And voltage will  be about 6.8 volts at pin 12 of u16201.

Check pin 12 of U 16201 for 3.8 volts . I the voltage is higher than 3.8 
volts (and it probably will be)
Adjust 12302 for a reading of 3.8 volts on the meter. Be extremely careful 
when you ajust L12302
because even a slight turn makes a significant difference in the voltage 
reading at pin 12. Turn the  coil an eight of a turn to get the correct 
reading.

John
Conti,TV
Texas







>From: "Robinson Electronics" <RobinsonElectronics@xxxxxxxxxxx>
>Reply-To: techassist@xxxxxxxxxxxxx
>To: <techassist@xxxxxxxxxxxxx>
>Subject: [TechAssist] RCA Proscan PS27115, Chassis  CTC197BC. Intermittent 
>loss of audio, just a pop sound when channels change?
>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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