[TechAssist] Re: RCA 27" TV - CTC167CS - Dead After Storm
- From: "David Lessard" <mr_fixit@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Tue, 12 Jul 2005 20:24:13 -0400
Thanks Max, I have a schematic for CTC169. Schematic says 4.9V at pin 24
of the micro and I am measuring that but shouldn't there be data here
when any OSG are displayed. I see nothing! My question still remains,
what should I see at pin 24 when OSG is working.
David Lessard
Mr_Fixit@xxxxxxxxxxxx
Alexandria, Ontario, Canada
-----Original Message-----
From: techassist-bounce@xxxxxxxxxxxxx
[mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Old TV Man
Sent: Tuesday, July 12, 2005 7:34 PM
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] Re: RCA 27" TV - CTC167CS - Dead After Storm
David I am looking at a CTC166 and pin 24 is 4.9 volts and goes to R3338
(470 ohms) to the base of Q2903.
If you want this page scanned let me know.
Max Bonnell
Bonnell TV
Robinson, IL
Sender: techassist-bounce@xxxxxxxxxxxxx From:
mr_fixit@xxxxxxxxxxxx(David=A0Lessard) Date: Tue, Jul 12, 2005, 4:38pm
(CDT+1) To: techassist@xxxxxxxxxxxxx Subject: [TechAssist] Re: RCA 27"
TV - CTC167CS - Dead After Storm Reply=A0to: techassist@xxxxxxxxxxxxx
Does anyone know what I should see at pin 24 (U3101) on the micro on
this set? I have no data activity when I press whatever buttons, no OSD
at all.
David Lessard
-----Original Message-----
From: techassist-bounce@xxxxxxxxxxxxx
[mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of David Lessard
Sent: Tuesday, July 12, 2005 3:46 PM To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] Re: RCA 27" TV - CTC167CS - Dead After Storm
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=3DA0Lessard) Date: Tue, Jun 28, 2005, 3:15pm
(CDT+1) To: techassist@xxxxxxxxxxxxx Subject: [TechAssist] Re: RCA 27"
TV - CTC167CS - Dead After Storm Reply=3DA0to: 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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