[TechAssist] Re: GE 20GT425 Turns OFF/ON Repeatedly
- From: HSWAD@xxxxxxx
- To: techassist@xxxxxxxxxxxxx
- Date: Mon, 9 Dec 2002 12:41:32 EST
Gosh man didn't mean to ruffle your feathers. With your scope you could have
observed the action as it turned on and off right back to the source of the
problem. Think about it. would have been faster. Just trying to give you the
same idea that I preached for 35 years as a field engineer. Congrats on
having a good scope. I remain-Hollis Bates, field Engineer-retired
In a message
dated 12/9/02 10:14:54 AM Eastern Standard Time, mrfixit@xxxxxxxxxxx writes:
> Subj:[TechAssist] Re: GE 20GT425 Turns OFF/ON Repeatedly
> Date:12/9/02 10:14:54 AM Eastern Standard Time
> From:<A HREF="mailto:mrfixit@xxxxxxxxxxx";>mrfixit@xxxxxxxxxxx</A>
> Reply-to:<A
> HREF="mailto:techassist@xxxxxxxxxxxxx";>techassist@xxxxxxxxxxxxx</A>
> To:<A HREF="mailto:techassist@xxxxxxxxxxxxx";>techassist@xxxxxxxxxxxxx</A>
> Sent from the Internet
>
>
>
>
> Hollis,
>
> Yes I have a scope, a nice one too! And as a professional just how is one
> supposed to monitor a problem where there is a constant cycling of the
> power
> OFF and ON. I ask you this question. Did you even read the symptom? Anyway
> tne problem is resolved, if you have any comments or suggestions in how
> someone should go about troubleshooting an intermittent like this then feel
> free to spread the word.
>
> "Share what you know, learn what you don't"
>
> David Lessard
> Alexandria Electronics
> 50 Harrison Street
> Alexandria, Ontario
> (613)525-4502
> mrfixit@xxxxxxxxxxx
>
> -----Original Message-----
> From: techassist-bounce@xxxxxxxxxxxxx
> [mailto:techassist-bounce@xxxxxxxxxxxxx]On Behalf Of HSWAD@xxxxxxx
> Sent: Monday, December 09, 2002 8:32 AM
> To: techassist@xxxxxxxxxxxxx
> Subject: [TechAssist] Re: GE 20GT425 Turns OFF/ON Repeatedly
>
>
> But you still found it with the hunt and peck method which costs both you
> and
> your customer money. Using your scope would have narrowed that down to 15
> minutes or so while the trouble was in progress. I have been telling guys
> for
> years to be a Tech not a tinkerer. Hollis Bates, Field Engineer retired
> USE
> YOUR SCOPE
> In
> a message dated 12/9/02 6:00:01 AM Eastern Standard Time,
> mrfixit@xxxxxxxxxxx
> writes:
>
>
> > Subj:[TechAssist] Re: GE 20GT425 Turns OFF/ON Repeatedly
> > Date:12/9/02 6:00:01 AM Eastern Standard Time
> > From:<A HREF="mailto:mrfixit@xxxxxxxxxxx";>mrfixit@xxxxxxxxxxx</A>
> > Reply-to:HREF="mailto:techassist@xxxxxxxxxxxxx";>techassist@xxxxxxxxxxxxx
> > To:<A HREF="mailto:techassist@xxxxxxxxxxxxx";>techassist@xxxxxxxxxxxxx</A>
> > Sent from the Internet
> >
> >
> >
> >
> > Symptom:
> >
> > Cyclic OFF/ON problem (relay clicking) usually after power-up but also
> > occured intermittently. The cycle can be stopped by holding the power
> > button
> > ON during the next OFF/ON cycle, then the TV shuts off normally. The
> > problem
> > was intermittent, sometimes days between acting up.
> >
> > Solution:
> >
> > Found numerous postings regarding CR4118, replaced it. No change.
> Confirmed
> > switch was not the problem by replacing it with another one. No change.
> > Re-soldered in and around HOT area, transformers, etc. No change. Further
> > investigation revealed several cold solder joints near R118U - 33ohm
> power
> > resistor near CR4118. Visual inpection didn't reveal this problem, the
> > joints appeared OK. The problem was discovered by applying pressure to
> the
> > PCB near R118U. This dog is out the door.
> >
> > Thanks to all who provided input.
> >
> > David Lessard
> > Alexandria Electronics
> > 50 Harrison Street
> > Alexandria, Ontario
> > (613)525-4502
> > mrfixit@xxxxxxxxxxx
> >
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