SOMEONE IS GOING TO END UP REMOVED OR ON NO-POST STATUS IF THIS DOESN'T STOP IMMEDIATELY!!!! Doug teltek2 wrote: > > Hollis; > A little suggestion....let's leave the "snide" remarks to the AOL chat > groups, not something the rest of us need to hear, so let's move on. > > -Ed- > Tel-Tek Electronics > Ontario-Canada > > teltek2@xxxxxxxxxxxx > ----- Original Message ----- > From: <HSWAD@xxxxxxx> > To: <techassist@xxxxxxxxxxxxx> > Sent: Monday, December 09, 2002 5:25 PM > Subject: [TechAssist] Re: GE 20GT425 Turns OFF/ON Repeatedly > > > Wow! In your comments you actually troubleshooted the problem. Now if you > had > > used a scope you would have actually observed what was happening instead > of > > guessing. You can see what those nasty little electrons are doing or not > > doing. I encourage you to use that scope cause you sound like winner to > me. > > You'll love the results. I'll help any way i can even if its by phone-my > > nickel. Hollis Bates, field engineer-retired > > In a > message > > dated 12/9/02 1:53:41 PM Eastern Standard Time, mrfixit@xxxxxxxxxxx > writes: > > > > > > > Subj:[TechAssist] Re: GE 20GT425 Turns OFF/ON Repeatedly > > > Date:12/9/02 1:53:41 PM 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 > > > > > > > > > > > > > > > I completely appreciate the help but I still don't understand how a > scope > > > would have helped here. The fact is the TV was cycling OFF then ON, > > > repeatedly. How could anyone conclude the source of the problem by > > > observing > > > intermittent signals and voltages? The control source for this cyclic > > > action > > > is the micro controller. What would I expect to see on the micro > controller > > > output pin to the relay? A signal level cycling OFF and ON repeatedly. > Not > > > much to conclude here. What else would I look at? The micro controller's > > > oscillator? The oscillator was always running, occasionally with a > glitch. > > > The ON/OFF switch to the micro? Tried that. Power to the micro circuit? > It > > > was intermittent. None of these observation concluded beyond a shadow of > a > > > doubt what the problem was. > > > > > > It was the good old "hunt and peck" method that identified the > intermittent > > > cold solder joint in the micro circuit. > > > > > > I don't have a schematic, but I believe the micro is powered by a > stand-by > > > power source. The cold solder joint repair was in the micro controller's > > > power supply. I'm not sure why I didn't observe more serious oscillator > > > glitches when the problem occured, perhaps the larger electrolytic > filter > > > capacitor kept things running during the power interruption. Just a > > > thought. > > > > > > I trust this concludes all that needs to be said about this problem. > > > > > > Thanks again to all who inputted. You guys are the best! > > > > > > David Lessard > > > Alexandria Electronics > > > Engineering Technologist > > > Embedded Software/Hardware Developer > > > mrfixit@xxxxxxxxxxx > > > (613)525-4502 > > > > > > > > > -----Original Message----- > > > From: techassist-bounce@xxxxxxxxxxxxx > > > [mailto:techassist-bounce@xxxxxxxxxxxxx]On Behalf Of HSWAD@xxxxxxx > > > Sent: Monday, December 09, 2002 12:42 PM > > > To: techassist@xxxxxxxxxxxxx > > > Subject: [TechAssist] Re: GE 20GT425 Turns OFF/ON Repeatedly > > > > > > > > > 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:HREF="mailto:techassist@xxxxxxxxxxxxx";>techassist@xxxxxxxxxxxxx > > > > 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: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 > > > > > > > > > > ------------------------------------------ > > > > > Submit A Repair Tip For Everyone Here: > > > > > http://www.tech-assist.org/secure/tip/main.html > > > > > ------------------------------------------ > > > > > To REMOVE your email address, click here: > > > > > http://www.tech-assist.org/unsubb.html > > > > > To CHANGE your email address, click here: > > > > > http://www.techassist.net/forms/change.html > > > > > > > > > > > > > > > > > > > > > ------------------------------------------ > > > > Submit A Repair Tip For Everyone Here: > > > > http://www.tech-assist.org/secure/tip/main.html > > > > ------------------------------------------ > > > > To REMOVE your email address, click here: > > > > http://www.tech-assist.org/unsubb.html > > > > To CHANGE your email address, click here: > > > > http://www.techassist.net/forms/change.html > > > > > > > > ------------------------------------------ > > > > Submit A Repair Tip For Everyone Here: > > > > http://www.tech-assist.org/secure/tip/main.html > > > > ------------------------------------------ > > > > To REMOVE your email address, click here: > > > > http://www.tech-assist.org/unsubb.html > > > > To CHANGE your email address, click here: > > > > http://www.techassist.net/forms/change.html > > > > > > > > > > > > > > > > ------------------------------------------ > > > Submit A Repair Tip For Everyone Here: > > > http://www.tech-assist.org/secure/tip/main.html > > > ------------------------------------------ > > > To REMOVE your email address, click here: > > > http://www.tech-assist.org/unsubb.html > > > To CHANGE your email address, click here: > > > http://www.techassist.net/forms/change.html > > > > > > ------------------------------------------ > > > Submit A Repair Tip For Everyone Here: > > > http://www.tech-assist.org/secure/tip/main.html > > > ------------------------------------------ > > > To REMOVE your email address, click here: > > > http://www.tech-assist.org/unsubb.html > > > To CHANGE your email address, click here: > > > http://www.techassist.net/forms/change.html > > > > > > > > > > > ------------------------------------------ > > Submit A Repair Tip For Everyone Here: > > http://www.tech-assist.org/secure/tip/main.html > > ------------------------------------------ > > To REMOVE your email address, click here: > > http://www.tech-assist.org/unsubb.html > > To CHANGE your email address, click here: > > http://www.techassist.net/forms/change.html > > > > > > ------------------------------------------ > Submit A Repair Tip For Everyone Here: > http://www.tech-assist.org/secure/tip/main.html > ------------------------------------------ > To REMOVE your email address, click here: > http://www.tech-assist.org/unsubb.html > To CHANGE your email address, click here: > http://www.techassist.net/forms/change.html -- Doug Keller "Learn from the mistakes of others, Wis-Kel Electronics because you won't live long enough 101 Freeland Ave. to make them all yourself" Terra Alta, WV USA 26764 dek@xxxxxxxxxx ------------------------------------------ Submit A Repair Tip For Everyone Here: http://www.tech-assist.org/secure/tip/main.html ------------------------------------------ To REMOVE your email address, click here: http://www.tech-assist.org/unsubb.html To CHANGE your email address, click here: http://www.techassist.net/forms/change.html