[TechAssist] Re: ctc169pf blows resistor up when turned off.

Robert, I don`t have a "PF" chassis listed in my SM parts list but most of
them
are 100 Ohm 1/2 watt, (R4125), I don`t follow your troubleshooting
procedure, C4311 and C4145 were both bad? If C4145 was bad then
CR4118 should be replaced DO NOT check, it will read good but fail
under load, your problems are probably switch mode not secondary,
did you check the HOT for c-e short? If not check it.
I would start by replacing C4102, C4104, C4108, C4102
almost allways has high esr and will cause a dead set, check Q4101`s
emitter resistor R4110, and zener cr4122, once you have changed
these parts plug in set but don`t turn set on, check your standby voltages
165 volts on C of Q4101, 143 on cathode of CR4116, U4101 pin 16
must have approx. 10.5 volts and not be varying at all, if jumping around
from 7 to 8 to 9 volts constantly you still have bad parts, try this and
repost with
your standby voltages, good luck, Larry E

Larry Eastman
American TV & Electronics
Crystal River, Fl. 34428
----- Original Message -----
From: "Robert Father" <rfather@xxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, December 31, 2004 11:10 AM
Subject: [TechAssist] ctc169pf blows resistor up when turned off.


> Hi Techs,
>     This is a strange one. I have a ctc169pf chassis. I replaced c4145,
> c4311, u4101, and Q4101. The set ran fine until I turned it off. It then
> blew up resistor r4125, I need the correct value for the resistor and any
> information regarding what would make the resistor blow up. Note the U4101
> and Q4101 also blew at the same time.
>     Thanks in advance for the assist.
> Bob Father
> Electronics Specialist
> Albany, New York
> robert@xxxxxxxxxxxxx
> rfather@xxxxxxxxxxxx
>
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