[TechAssist] Re: RCA F35751MB CTC169BG5 pop in audio, orig had shorted HOT
- From: "Larry E" <videotech@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 13 Jul 2005 20:30:14 -0400
Dan, thanks for the reply, changed it but no help, I`ll keep looking, Larry
E
Larry Eastman
American TV & Electronics
Crystal River, Fl. 34428
----- Original Message -----
From: "Webster's TV" <webstertv@xxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, July 08, 2005 2:50 PM
Subject: [TechAssist] Re: RCA F35751MB CTC169BG5 pop in audio, orig had
shorted HOT
> Larry,
>
> Did you try replacing C4108(47m-50v), its located in the base circuit of
> Q4101(chopper output). This cap can cause all kinds of different problems,
> from popping noise in speakers in off mode , to no start up. Just a
thought!
>
> Dan Webster
> Webster's TV
> Shullsburg, Wi.
> ----- Original Message -----
> From: "Larry E" <videotech@xxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Thursday, July 07, 2005 3:00 PM
> Subject: [TechAssist] RCA F35751MB CTC169BG5 pop in audio, orig had
shorted
> HOT
>
>
> > Hi Guys, picked up this monster F35751MB because it had a shorted HOT,
> replaced with oem
> > checked all the diodes and caps in Horizontal circuit, standby B+`s were
> all good so I started
> > it up, made loud popping sounds through speakers and would not run,
pulled
> P1903 from
> > audio board and set started with good picture, replaced both audio
> outputs, this chassis uses
> > 2 tda2052`s, replaced 2 low profile electrolytics that were leaking
fluid,
> C905p & C564p ,
> > re-installed P1903 set still is very hard to start and pops loudly, have
> both + & - 17
> > volt supplies but found that the 5 volts on smd transistor Q915`s
> collector is dropping with
> > the pop cycle, removed this DC sense transistor and set will pop once
and
> start perfectly
> > with good audio, it also pops once when shutting off the set, l checked
> the smd transistor it reads
> > good, I don`t have the exact schematic for this audio stage but it
appears
> this 5v collector line
> > for Q915 comes from the main module, anybody got any tips for this
problem
> ? Thanks in advance
> > Larry E
> >
> > Larry Eastman
> > American TV & Electronics
> > Crystal River, Fl. 34428
> >
>
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