[TechAssist] Re: Projo RCA CTC169 Dead with wrong standby voltages
- From: "al m" <ampm@xxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Mon, 7 Mar 2005 07:52:46 -0500
Try changing the cap.
Al Marquardt
ampm@xxxxxxx
Al Marquardt Electronic Repair
206 W Main
Girardville Pa. 17935
----- Original Message -----
From: "Warren" <warrenca@xxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Sunday, March 06, 2005 11:20 PM
Subject: [TechAssist] Re: Projo RCA CTC169 Dead with wrong standby voltages
> Al
> THank's I've changed the 143V diode and checked the cap , so that's not
> what's wrong.
> WC
> al m wrote:
>
>>Do you have a print of the power supply? The 15V supply is ok so the
>>regulator is probably working. Check the diode on the 143V line and the
>>filter Cap.
>>Al Marquardt
>>ampm@xxxxxxx
>>Al Marquardt Electronic Repair
>>206 W Main
>>Girardville Pa. 17935
>>----- 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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>>>>>
>>>>>
>>>>
>>>>
>>>>
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