[TechAssist] Re: RCA CTC169 35" Audio hum in standby, thumps@ turn on
- From: Bill Grabowski <bgrabowski@xxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Thu, 28 Apr 2005 19:15:28 -0500
Check the solder connection at pin #1 at the SMPS transformer for cracks.
Bill Grabowski
Triangle Appliance
Kenosha,WI 53142
Webster's TV wrote:
> Phil,
>
> What about C4108(47m-50v) in base circuit of Q4101(chopper output). Have had
> this cap cause thumping or popping in speakers when the unit is off.
>
> Dan Webster
> Webster's TV
> Shullsburg, Wi.
> ----- Original Message -----
> From: "Phil Bader" <tjanphyl@xxxxxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Thursday, April 28, 2005 8:55 AM
> Subject: [TechAssist] RCA CTC169 35" Audio hum in standby, thumps@ turn on
>
>
>
>>Sorry, no model. Assisting another shop. He says with this 35" RCA
>>CTC169 chassis, when he just plugs it in, he hears a low hum thru the
>>speakers. When he powers the set up, he hears a thump (or
>>thumps).Otherwise all works OK. I said to look on the upright audio
>>output board ( the one with the outputs and jacks) and locate the small
>>lytic caps near the front edge, next to the audio out IC's heat sink.
>>These caps sually leak. Usually are about 47mfd@16V. Am I overlooking
>>anything else,or any other fixes for this hum/thump symptom?
>>Thanks,
>>Phil
>>
>>--
>>
>>Philip Bader
>>Jan Phyl TV Inc. (estab. 1976)
>>3420 Recker Hwy. Winter Haven, Fl. 33880
>>Fax (863) 299-8821
>>email: tjanphyl@xxxxxxxxxxxxxxx
>>
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--
*****************************
Bill Grabowski
Triangle Appliance
Kenosha,Wi 53142
262-694-6500
262-694-6523 fax
bgrabowski@xxxxxxxxx
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