[TechAssist] Re: RCA 27" TV - CTC167CS - Dead After Storm
- From: "David Lessard" <mr_fixit@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 29 Jun 2005 12:08:40 -0400
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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