[TechAssist] Re: Projo RCA CTC169 Dead with wrong standby voltages
- From: "al m" <ampm@xxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Sun, 6 Mar 2005 16:40:12 -0500
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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