[TechAssist] Re: Projo RCA CTC169 Dead with wrong standby voltages
- From: wpt19@xxxxxxxxx (Pete)
- To: techassist@xxxxxxxxxxxxx
- Date: Sun, 6 Mar 2005 10:18:05 -0500
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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