[TechAssist] Re: RCA 27" TV - CTC167CS - Dead After Storm
- From: "David Lessard" <mr_fixit@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Tue, 12 Jul 2005 15:45:54 -0400
CR4118 is not the problem, I have all voltages off this diode. However I
don't see any activity on pin 24 of the micro when I hit the menu
button, channel or volume button, should I not expect to see some sort
of activity here? I'm about to give up on this thing, too damn hot to
work in the shop today, can't think straight. I'm still looking for help
on this please and thanks.
David Lessard
Mr_fixit@xxxxxxxxxxxx
Alexandria, Ontario, Canada
-----Original Message-----
From: techassist-bounce@xxxxxxxxxxxxx
[mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of David Lessard
Sent: Tuesday, July 12, 2005 3:02 PM
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] Re: RCA 27" TV - CTC167CS - Dead After Storm
I found it, off +12V run voltage regulator Q4106, I'll check this too.
Thanks. David Lessard.
-----Original Message-----
From: techassist-bounce@xxxxxxxxxxxxx
[mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of David Lessard
Sent: Tuesday, July 12, 2005 2:57 PM
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] Re: RCA 27" TV - CTC167CS - Dead After Storm
Where is this part located Gary?
David Lessard
-----Original Message-----
From: techassist-bounce@xxxxxxxxxxxxx
[mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Gary McCartney
Sent: Tuesday, July 12, 2005 2:57 PM
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] Re: RCA 27" TV - CTC167CS - Dead After Storm
I have tip here says to replace CR4118 for no OSG.
Gary McCartney
McCartney Electronics
Guelph Ontario Canada
Est. 1984
email: gary (at) number63.ca
David Lessard wrote:
> Okay, I see the OSG path now, it's from pin 24 of the micro via Q2903
> over to Q5004 on the CRT PCB. Now to check if I get an OSG signal or
> not, I'll let you know what I find.
>
> David Lessard
> Mr_fixit@xxxxxxxxxxxx
> Alexandria, Ontario, Canada
>
> -----Original Message-----
> From: techassist-bounce@xxxxxxxxxxxxx
> [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of David Lessard
> Sent: Tuesday, July 12, 2005 2:02 PM
> To: techassist@xxxxxxxxxxxxx
> Subject: [TechAssist] Re: RCA 27" TV - CTC167CS - Dead After Storm
>
> FOLLOWUP:
>
> I stand corrected on a few things here. What I did was grab a remote
to
> check certain things out, what I found is I can select channels via
the
> tuner, I can select channel 91 and make A/V inputs the source, I can
> adjust volume and change channels. What I can't do is adjust video or
> audio or get into the setup screen. There is no OSG, I'm not sure if I
> have a complete schematic here as I can not find what IC does the OSG.
I
> need some help with this OSG stuff please.
>
> David Lessard
> Mr_fixit@xxxxxxxxxxxx
> Alexandria, Ontario, Canada
>
> -----Original Message-----
> From: techassist-bounce@xxxxxxxxxxxxx
> [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of David Lessard
> Sent: Tuesday, July 12, 2005 1:38 PM
> To: techassist@xxxxxxxxxxxxx
> Subject: [TechAssist] Re: RCA 27" TV - CTC167CS - Dead After Storm
>
> Forgot to mention A/V inputs work but not the way they are supposed
to.
> As soon as the TV is turned "ON" the A/V inputs are selected as the
> source, pressing CH up or down does nothing, VOL up and down works,
> other then that no OSG when SETUP, AUDIO or VIDEO is pressed. So
> basically I have no tuner being selected as the source and no OSG. My
> question is what IC generates the OSG? Has anyone seen this problem
> before?
>
> Thanks again,
> David Lessard
> Mr_fixit@xxxxxxxxxxxx
>
> -----Original Message-----
> From: techassist-bounce@xxxxxxxxxxxxx
> [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of David Lessard
> Sent: Tuesday, July 12, 2005 1:06 PM
> To: techassist@xxxxxxxxxxxxx
> Subject: [TechAssist] Re: RCA 27" TV - CTC167CS - Dead After Storm
>
> Received micro and installed it, TV fired-up but no video, no audio,
no
> OSG. Turning up the screen level on FBT I see retrace lines and a
> purplish screen. I'm going to check voltage around jungle IC; it's
> possible I may need a jungle IC too. Any pointers/tips would be
> appreciated.
>
> David Lessard
> Mr_fixit@xxxxxxxxxxxx
> Alexandria, Ontario, Canada
>
> -----Original Message-----
> From: techassist-bounce@xxxxxxxxxxxxx
> [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of David Lessard
> Sent: Wednesday, June 29, 2005 12:09 PM
> To: techassist@xxxxxxxxxxxxx
> Subject: [TechAssist] Re: RCA 27" TV - CTC167CS - Dead After Storm
>
> Gentlemen,
>
> I'm not able to locate a used part for this chassis. Customer would
like
> to keep this nice wooden cabinet TV for sentimental reasons. PCB
> location is U3101 - microcontroller. Number on the IC:
>
> 1A66111-01E
> 2 9131
> TCE1991
>
> If anyone has this micro in there junk pile(s) please email me in
> private naming your price.
>
> David Lessard
> Mr_fixit@xxxxxxxxxxxx
> Alexandria, Ontario, Canada
> K0C-1A0
>
> -----Original Message-----
> From: techassist-bounce@xxxxxxxxxxxxx
> [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Old TV Man
> Sent: Tuesday, June 28, 2005 4:45 PM
> To: techassist@xxxxxxxxxxxxx
> Subject: [TechAssist] Re: RCA 27" TV - CTC167CS - Dead After Storm
>
> David - Do you have a part # or a number off of the U3101?
>
> Max Bonnell
> Bonnell TV
> Robinson, IL
>
> Sender: techassist-bounce@xxxxxxxxxxxxx From:
> mr_fixit@xxxxxxxxxxxx(David=A0Lessard) Date: Tue, Jun 28, 2005, 3:15pm
> (CDT+1) To: techassist@xxxxxxxxxxxxx Subject: [TechAssist] Re: RCA 27"
> TV - CTC167CS - Dead After Storm Reply=A0to: techassist@xxxxxxxxxxxxx
>
> Thanks for the service manual Eric. Once in hand it was easy to trace
> the problem to U3101 pin 42, Vcc to ground is shorted, no shorts
> anywhere else. Now to find one! Does anyone have a used one kicking
> around? I don't believe this chassis's micro is still available. Of
> course I won't know if anything else is a problem until I get the
micro
> replaced.
> Thanks in advance,
> God bless you all,
>
> David Lessard
> Mr_fixit@xxxxxxxxxxxxx
> Alexandria, Ontario, Canada
> K0C-1A0
>
> -----Original Message-----
> From: techassist-bounce@xxxxxxxxxxxxx
> [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Wayne Vanaman
> Sent: Monday, June 27, 2005 3:48 PM To: techassist@xxxxxxxxxxxxx
> Subject: [TechAssist] Re: RCA 27" TV - CTC167CS - Dead After Storm
>
> David:
> I don't see the 12V going too many places, but of course the 5V is all
> over the place.
> On the 5V reg q4160e is a coil L3101, this splits the "two" 5V
supplies
> and lifting one end might tell which path the current is following.
The
> SAMS says q4161 has a 29mA current flow, for what that is worth, but
> they don't tell us about the 5V paths.
>
> Wayne Vanaman
> Omega Electronics
> 6904 W Fairfield Dr
> Pensacola, Fl. 32506-3310
> Wayne@xxxxxxxxxxxxxxxxxxxxx
> WWW.PensacolaTVRepair.Com
> 850-456-5995 voice
> 850-458-6369 fax
>
> David Lessard wrote:
> Thanks for the information Wayne. I just noticed that Q4161 gets quite
> hot after just a minute, so I have a short somewhere off this
> transistor, now just to find it. I'll let you know what I find. I may
> have a few more questions before this is all over.
>
> David Lessard
> Mr_fixit@xxxxxxxxxxxx
> Alexandria, Ontario, Canada
> K0C-1A0
>
> -----Original Message-----
> From: techassist-bounce@xxxxxxxxxxxxx
> [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Wayne Vanaman
> Sent: Monday, June 27, 2005 2:53 PM To: techassist@xxxxxxxxxxxxx
> Subject: [TechAssist] Re: RCA 27" TV - CTC167CS - Dead After Storm
>
> Hi David:
> The on/off command comes from the micro, U3101p18. U3101 pins:
> 18 on/off
> 31-32 crystal
> 33 reset low
> 40 data
> 41 clock
> 42 5v
> The reset pin, 33, is feed by the 12v supply true zener cr3101 with
> r3116 2400 ohms to ground.
> The 12 V supply is sourced by transformer T4601, diodes cr4601-4.
Q4161c
> connects to cr4603/4 cathodes and is 22v. Q4161e is the 12V standby
> source, which also feeds q4160, the 5V standby reg. Q4160e being the
5v
> supply.
> It has been a long time since I have seen one of these, so this is
from
> memory. Looking down at the component side of the board with the tuner
> on your left. Towards the left hand side look for a diode that in
> standby has voltage on the anode but not on the cathode, if so, change
> it.
>
> Wayne Vanaman
> Omega Electronics
> 6904 W Fairfield Dr
> Pensacola, Fl. 32506-3310
> Wayne@xxxxxxxxxxxxxxxxxxxxx
> WWW.PensacolaTVRepair.Com
> 850-456-5995 voice
> 850-458-6369 fax
>
> David Lessard wrote:
> I stand corrected, I measure 11.7VDC at C605. Is this the proper
> voltage
> level? From there 11.7VDC goes over to Q161, off Q161-(E) voltage is
> 7.2VDC. From there the traces get too small for my weak eyes. Which
> pin
> at micro is Vcc? Which pin at micro is relay "ON"?
>
> David Lessard
> Mr_fixit@xxxxxxxxxxxx
> Alexandria, Ontario, Canada
> K0C-1A0
>
> -----Original Message-----
> From: techassist-bounce@xxxxxxxxxxxxx
> [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of David Lessard
> Sent: Monday, June 27, 2005 1:39 PM To: techassist@xxxxxxxxxxxxx
> Subject: [TechAssist] RCA 27" TV - CTC167CS - Dead After Storm
>
> Gentlemen,
> I can not find my service manual for this older chassis, lent it out
> and
> it never came back. Does anyone have an e-copy they could send along?
> Standby PS is working, 16VDC is present at the bridge rectifier off
> secondary of standby transformer however relay doesn't activate when
> "ON" button is pressed. Where does secondary standby voltage go after
> this, regulator? I've only worked on (3) of these ever before, a
> troubleshooting guide and/or service manual would be greatly
> appreciated.
> Thanks in advance,
>
> David Lessard
> Mr_fixit@xxxxxxxxxxxx
> Alexandria, Ontario, Canada
> K0C-1A0
> ----------------------------------------------
> -----
>
>
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