[TechAssist] Re: Projo RCA CTC169 Dead with wrong standby voltages
- From: Warren <warrenca@xxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Sun, 06 Mar 2005 23:23:11 -0500
Bill
Sorry if I did not make myself clear on the 143V standby Voltage
I do not have a readable 143 I think that it's much higher even though
I can't read it.
Please reread my other posts Thanks
WC
Bill Grabowski wrote:
> From my past experience the 14.2 at the 15volt CR4118 is normal and the
>the regulated B+ at 143volts is also acceptable. See if you get a 26
>volt reading from the scan derived circuit. Audio output might be
>shorted causing shutdown. Also diode,cap,or HOT in Horiz section. Just
>my 2 cents!!
>
>Bill Grabowski
>Triangle Appliance
>Kenosha, WI 53142
>
>Warren wrote:
>
>
>
>>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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