[TechAssist] Re: RCA 27" TV - CTC167CS - Dead After Storm
- From: "David Lessard" <mr_fixit@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 13 Jul 2005 12:49:54 -0400
I double checked this signal at pin 24 and there is nothing at all when
I press buttons, I should expect to see what John describes below
whenever OSG is active (thanks for this information John). I even
isolated the pin from the PCB to make sure it wasn't being shorted to
ground or whatever. I think I may still have a bad micro here. The video
is washed out also whether I use the RF (tuner) or A/V inputs. I'm not
sure if the jungle IC was affected by the surge and I'm reluctant to
conclude I have a bad jungle IC until I'm sure about the micro because
it controls brightness, contrast, etc. I'm going to look for another
micro before moving on.
David Lessard
Mr_Fixit@xxxxxxxxxxxx
Alexandria, Ontario, Canada
-----Original Message-----
From: techassist-bounce@xxxxxxxxxxxxx
[mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of John Conti
Sent: Wednesday, July 13, 2005 9:54 AM
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] Re: RCA 27" TV - CTC167CS - Dead After Storm
David. pin 24 shows 2v/20usec/div dc coupled video menu display.
off of the emitter of Q2903 the o s d green buffer you should see
.2v/20usec/div ac coupled video menu display.
John
Conti,TV
Texas
>From: "David Lessard" <mr_fixit@xxxxxxxxxxxx>
>Reply-To: techassist@xxxxxxxxxxxxx
>To: <techassist@xxxxxxxxxxxxx>
>Subject: [TechAssist] Re: RCA 27" TV - CTC167CS - Dead After Storm
>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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