[TechAssist] Re: GE 20GT425 Turns OFF/ON Repeatedly
- From: HSWAD@xxxxxxx
- To: techassist@xxxxxxxxxxxxx
- Date: Mon, 9 Dec 2002 12:56:53 EST
In my classes for various manufacturers I used the term " tinkerers" for
technicians who did not use all equipment available to them. Thus the term
tinkerers. I would submit that a proper and fast way to troubleshoot the
problem would have been to monitor the on-off pin on the microprocessor. That
way the defect could have been narrowed down to that point on to the relay or
within the micro by observing the unsoldered on-off pin on the micro. If when
unsoldered the set would not start up then one would know that the trouble
was within the micro or before. Get my drift? If I'm abrupt guys I
apologise.Hollis Bates, field Engineer-retired
In a
message dated 12/9/02 11:02:07 AM Eastern Standard Time, mrfixit@xxxxxxxxxxx
writes:
> Subj:[TechAssist] Re: GE 20GT425 Turns OFF/ON Repeatedly
> Date:12/9/02 11:02:07 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
>
>
>
>
> Ed,
>
> Point taken. However my question still remains. I would appreciate any
> pointers on how to diagnose a problem like the one I had. Furthermore I
> think that it's inappropiate for a fellow technician to suggest "we are
> tinkerers and not technicians". I became slightly defensive in my response
> because I don't take comments like this too lightly from technicians who
> should understand the problems with diagnosing intermittent problems.
> Comments like, "use your scope that's the professional way to troubleshoot"
> and that "we a tinkerers" are negative comments. Sharing your knowledge is
> a
> good thing,
>
> I believe positive comments whould have been more effective, then again, it
> may just be the way I interpreted my fellow technician's response to my
> posting.
>
> Sorry if I insulted anyone.
>
> "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 teltek2
> Sent: Monday, December 09, 2002 10:21 AM
> To: techassist@xxxxxxxxxxxxx
> Subject: [TechAssist] Re: GE 20GT425 Turns OFF/ON Repeatedly
>
>
>
> David;
> Lower your angle of "attack",may have to read up on "Email Diplomacy 101".
> May just be the way you are coming across, Remember....wer'e here to
> help....;-)
>
> -Ed-
> Tel-Tek Electronics
> Ontario-Canada
>
> teltek2@xxxxxxxxxxxx
> ----- 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:> HREF="mailto:techassist@xxxxxxxxxxxxx";>
> techassist@xxxxxxxxxxxxx
> > > To:HREF="mailto:techassist@xxxxxxxxxxxxx";>techassist@xxxxxxxxxxxxx
> > > 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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