[TechAssist] Re: GE 20GT425 Turns OFF/ON Repeatedly
- From: "J Silverman" <greentron@xxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Mon, 9 Dec 2002 15:29:49 -0500
You might try monitoring the power voltage to the micro. As things turn on,
the voltage may be dropping enough to trigger the micro reset circuit. If
that is happening you either have a power problem or a load problem. Besides
looking for the more common defective components, you could start to remove
or reduce the various loads until something changes, thus pointing to a
specific area to troubleshoot. An alternative is to power the micro from a
bench supply, turn the AC to the set on and see what starts smoking.
Jerry Silverman
Greentron Inc
4 Newland Ave
Greenville SC 29609
864 232 3889
Fax 271 2080
mailto:greentron@xxxxxxx
----- Original Message -----
From: "David Lessard" <mrfixit@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Monday, December 09, 2002 9:45 AM
Subject: [TechAssist] Re: GE 20GT425 Turns OFF/ON Repeatedly
>
> 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:<A
> HREF="mailto:techassist@xxxxxxxxxxxxx";>techassist@xxxxxxxxxxxxx</A>
> > 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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