[TechAssist] Re: 32" RCA CTC187 - Dead Set
- From: "Dan Garris" <dgarris@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Sat, 23 Oct 2004 18:42:51 -0400
Yes, Hollis - I'm using my SC-61 and I have taken several voltages and
waveforms - it's one of those sets that is just going to take some good long
hard troubleshooting on (smile). All IC's and eeprom have VCC and I am
getting good IR remote signal input, just got to really dig deep on this
one, if I can even find the problem. It's also possible that R2921U resistor
was bent from factory and touching the metal case and a bare jumper on the
pcb. Set was repaired and working last week and when the board was moved it
stopped working, we believe the resistor caused it to die, it was clearly at
the point of touching the metal case and the other lead was right at
touching a jumper, there is even a small "arch" mark on the sheild and
jumper at the resistor where possible burn occurred. Replaced Q4401 Hot
(shorted) and U4101 Reg IC, and replaced Q4852, Q4104 (both checked ok but
replaced), Changed U2903 (L7805AC), and still not working. Still digging and
checking. Supplying +12v to the emitter of Q4852 (12v Reg) will fire up the
set but it has a blank raster and no control or OSD. So I am still digging,
this is going to be a tough dog I believe. I just hated to throw away this
nice 32" Stereo TV w/ PIP.
Dan Garris
Garris TV
New Bern, NC
>From: HSWAD@xxxxxxx
>Reply-To: techassist@xxxxxxxxxxxxx
>To: techassist@xxxxxxxxxxxxx
>Subject: [TechAssist] Re: 32" RCA CTC187 - Dead Set
>Date: Sat, 23 Oct 2004 18:16:06 EDT
>
>
>Have you tried using your scope to pinpoint your problem? Hollis Bates,
>Field engineer-retired, Lewiston, Maine, _HSWAD@xxxxxxxx
>(mailto:HSWAD@xxxxxxx)
> In a
>message dated 10/23/04 6:05:23 PM Eastern Daylight Time,
>dgarris@xxxxxxxxxxx
>writes:
>For now, I do not think so Max, I'm using a Sams #3672. Thanks for the
>offer.
>
>Dan Garris
>Garrris Radio & TV
>New Bern, NC
>
> >From: mebonnell@xxxxxxxxx (Old TV Man)
> >Reply-To: techassist@xxxxxxxxxxxxx
> >To: techassist@xxxxxxxxxxxxx
> >Subject: [TechAssist] Re: 32" RCA CTC187 - Dead Set
> >Date: Sat, 23 Oct 2004 16:03:02 -0500
> >
> >Dan - do you need the schematic scanned?
> >
> >Max Bonnell
> >Bonnell TV
> >Robinson, IL
> >
> >
> >
> >Sender: techassist-bounce@xxxxxxxxxxxxx From:
> >dgarris@xxxxxxxxxxx(Dan=A0Garris) Date: Sat, Oct 23, 2004, 4:30pm
> >(CDT+1) To: techassist@xxxxxxxxxxxxx Subject: [TechAssist] 32" RCA
> >CTC187 - Dead Set? Reply=A0to: techassist@xxxxxxxxxxxxx
> >
> >What: =A0 32" RCA TV
> >Model: =A0 F32672SB
> >Chassis: CTC187CL3
> >Sams#: 3672
> >Dead Set, No blown fuse, No Relay CLick, HOT Shorted.
> >
> >Replaced w/ Original Q4401 BUH517 HOT, Replaced U4101 STK730-150
> >Regulator IC, Performed TOB repairs and even changed the 223957 eeprom,
> >(using original eeprom set still dead) Checked several of the common
> >failure diodes ok, Resoldered L14101 coil and horiz. driver transformer.
> >The standby p/s voltages are all there and ok (These are test points 1-5
> >on the Sams). I supplied +12v to the emitter of Q4852 (12v Reg) to get
> >the set to fire up and it did, ...I turned up the screen control on the
> >flyback and I have a blank screen with retrace lines, no picture, no
> >OSD, can't even access setup menu. At least I know the FBT & HV circuits
> >are workable! I am getting a mental block on this one and looking for
> >some help. Do I have a bad T-Chip or has anyone seen this description
> >while troubleshooting a CTC187?
> >
> >Dan Garris
> >Garris Radio & TV
> >New Bern, NC
> >dgarris@xxxxxxxxxxx
> >Ph: (252) 638-4477
> >----------------------------------------------
> >
> >
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