[TechAssist] Re: Projo RCA CTC169 Dead with wrong standby voltages
- From: Warren <warrenca@xxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Wed, 09 Mar 2005 23:43:39 -0500
Larry
I posted the complete numbers on an earlier post but here thay are
again for you.
Here is the exact numbers
Mod. P46100TN
Chassis # CTC169HN
Also on the back PTK169HNA C
Thank's All
Warren C
Larry E wrote:
>Warren, you need to list FULL chassis number and give full model # there are
>way too many variations of the 169 chassis that`s why your schematic shows a
>39uf cap
>but your C4108 was a 47uf. In standby you should use CR4116`s cathode for
>checking regulated B+ and yes it should be around 143 volts. It sounds like
>you
>have correct standby voltages, there are many other things that can cause a
>dead set
>the horizontal crystal, the HV splitter, caps off the HOT, shorted audio
>board etc. etc.
>list the complete model # and complete chassis # and I`ll look up which
>"family"
>your 169 is, Larry E
>
>Larry Eastman
>American TV & Electronics
>Crystal River, Fl. 34428
>----- Original Message -----
>From: "Warren" <warrenca@xxxxxxxxx>
>To: <techassist@xxxxxxxxxxxxx>
>Sent: Sunday, March 06, 2005 2:15 PM
>Subject: [TechAssist] Re: Projo RCA CTC169 Dead with wrong standby voltages
>
>
>
>
>>I would like to know :
>>If there is a problem in the horiz section or elsewhere will it cause
>>the P.S. to give wrong standby voltages when the set is off
>>and won't turn on??.
>>I must establish if the problem is in the PS or not.
>>When you read the hints on the fishe(RCA) it says that, if you have
>>the 5 V standby then the problem is probably elsewhere.
>>I have the 5V but the 15V standby is at 14.2 and the 143 is high and my
>>meter is having trouble reading the voltage.
>>Changed the meter and the same thing.
>>3 Volts also between the cathodes of two diodes at PS (#'s escape me
>>right now) is too high .All say that this should be <1V when in standby
>>If you read my first posts you will see that I've changed many of the
>>usual parts.
>>I must establish if the PS should give proper voltages on it's own when
>>plugged into the wall and possible problems elsewhere???
>>Thanks
>>Warren C
>>
>>Bill Grabowski wrote:
>>
>>
>>
>>>Is your Horiz output circuit okay. There are 5 shutdown circuits
>>>employed on these CTC169's
>>>
>>>Pete wrote:
>>>
>>>
>>>
>>>
>>>>I always replace the caps with the same value on the set, The standby B+
>>>>must be 138-140V, running voltage 143-145V, .
>>>>Remove and clean the running voltage control, inside the black plastic
>>>>cover.
>>>>check audio output chips removing the plug in the audio board.
>>>>Good luck
>>>>
>>>>pete
>>>>
>>>>Perdomo TV, Inc. Since 1972
>>>>MIami, Fl.
>>>>
>>>>
>>>>From: Warren" <warrenca@xxxxxxxxx>
>>>>To: <techassist@xxxxxxxxxxxxx>
>>>>Sent: Friday, March 04, 2005 10:47 PM
>>>>Subject: [TechAssist] Projo RCA CTC169 Dead with wrong standby voltages
>>>>
>>>>Hi all!
>>>>I will list the work so far:
>>>>15 V standby =3D 14.2
>>>>5V standby =3D4.9V
>>>>Raw B+=3D151V
>>>>Regulated B+ is too high I think ...The meter does not like the signal
>>>>at TP4101 some times 197V sometimes 1.97V?? Should the Reg B+ be 143V
>>>>before turn on????
>>>>=A0=A0From cathode of CR4106 to Cathode of CR4101 first I had 2
>>>>Volts.... Now
>>>>after changing diodes I get 3 volts???
>>>>Should be under 1 Volt.
>>>>Installed a startup kit from Global Q4101, U4101, C4102, C4118, C4108
>>>>(47uf) which also was a 47UF before.
>>>>My schematic shows 39uf ?? does this make a difference?? Caps were
>>>>installed first with Q4101 , IC =A0 U4101 was installed
>>>>afterwards.
>>>>Also changed C4104(15uf) with also no change.
>>>>I also tried to isolate the H out (curiosity) - no change
>>>>I've read many tips but most of these point to the parts that I've
>>>>already changed.
>>>>Can someone brush up my 169 skills.
>>>>What am I missing??
>>>>Does anyone have a troubleshooting flow chart for the 169?? This would
>>>>help.
>>>>BTW when you push the on button you can see the front led give a slight
>>>>single blink.
>>>>TIA all !
>>>>All tips and comments welcome.
>>>>------------------------------------------
>>>>
>>>>
>>>>
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