[TechAssist] Re: RCA 27" TV - CTC167CS - Dead After Storm
- From: Wayne Vanaman <Wayne@xxxxxxxxxxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Mon, 27 Jun 2005 14:47:37 -0500
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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