[TechAssist] Re: RCA 27" TV - CTC167CS - Dead After Storm
- From: "David Lessard" <mr_fixit@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Mon, 27 Jun 2005 15:35:32 -0400
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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