On a Linear supply that light bulb arrangement will work great. On a SMPS I still like to put the bulb in series with the 130vdc B+ to the flyback. With this 25X6 chassis since it is a linear supply putting the bulb in series with the AC line fuse works great as a dynamic current limiter. And you know you don't have to use a socket on a board, You can use a all rubber socket with two pigtail wires coming out of it. Just use clip leads to attach it to the open fuse terminals. Dennis Viereck Edward Gaidies wrote: > Perry; > You don't need to solder a light bulb in. You make up a little jig, with the > light bulb in series with an AC receptacle, on a little sheet of plywood. > Then plug the TV under test directly into the AC receptacle. > > -Ed- > > > > > Friends: > > > > We used to use the light bulb test on Motorola base stations to find shorts > > after lightning strikes. If the bulb had a bright glow, you had shorts to > > find. We just simply repaired circuits until the bulb went dim. But those > > had a round screw in fuse the same size as a light bulb. We have found on > > most TV's, if you run your powerite down to around 80 volts, you may not > > blow any parts if the flyback is bad, however, the flyback will get warm, or > > in some cases might even smoke a little. The best way though is to use a > > Sencore VG92, and do a load test, with everything in circuit. It will check > > your timing and loads, you will know in less than five minutes if your > > flyback is bad. That is just what works for us. It is hard to get my young > > techs to solder a light bulb socket into a little TV chassis. They try to > > come up with quicker test. My 2 cents. > > > > Perry Bower > > Electric Medic > > "It's Cheaper to Keep Her" > > 3850 Washington Road Suite 5b > > Martinez, Georgia 30907 > > Phone: 706-8MEDIC4 (863-3424) > > Phone: 706-863-3474 > > Fax: 706-863-2316 > > Website: www.electricmedic.com > > mailto:info@xxxxxxxxxxxxxxxxx > > "WE REPAIR WITH CARE" > > More Info: www.augusta-ga.bbb.org/report.html?compid=6001278&national=y > > > > Factory Trained Authorized Service Center For: Fisher, GE, KEC/KTV, Konka, > > Mitsubishi, Panasonic, Philips Magnavox, Pioneer, ProSCAN, RCA, Samsung, > > Sanyo, Sharp, SONY, Technics, Zenith > > > > Provide Extended care for: AON, Circuit City, GE Contracts, Glass Agency, > > Philips Contracts, NEW, Rex > > > > > > -----Original Message----- > > From: techassist-bounce@xxxxxxxxxxxxx > > [mailto:techassist-bounce@xxxxxxxxxxxxx]On Behalf Of Dennis Viereck > > Sent: Sunday, January 20, 2002 2:22 AM > > To: techassist@xxxxxxxxxxxxx > > Subject: [TechAssist] Re: MAG: 25X6 chassis Quick Question? > > > > > > > > No need to blow up any parts. Use a 40 watt light bulb in series with the B+ > > to > > the flyback. Connect your oscilloscope to the collector of the horizontal > > output > > transistor. Set the scope to resolve a 600 volt PP signal at 10 micro > > seconds > > per division. Power up the set an look for a clean undistorted pulse with a > > duty > > cycle of 11.7 microseconds "OFF" time and a "ON" time of 51.7 microseconds. > > > > Any extra ringing or distortion means you have a heavy load on the secondary > > or > > an internal shorted winding. > > > > The light bulb saves components, and buys time to measure the "Must Haves" > > in > > that circuit. Sometimes only 2 or 3 seconds is necessary to make this > > measurement. Most of the time after a short test like this and it is a > > flyback, > > one can feel the heat generated in the flyback by the bad winding or diode > > stack. > > > > Dennis Viereck > > > > Bill McFarland wrote: > > > >> Hey no problem, > >> > >> The old "N" chassis used to do this all the time (The flyback was almost > >> always bad) > >> > >> I was just wondering if anyone could say "Yea those crap the bed all the > >> time!" It would give me a little more to go on when on Monday I use my > >> "Stone-aged" BK 1077 to ring it. (Its only about 75% effective...And that > >> only if the flyback is completely out of the unit) > >> > >> I hate blowing parts up! > >> > >> Funny thing is now that "I" am the one paying for the parts. I sure am a > > lot > >> more careful about things like this. When I worked for someone else it was > >> faster to just change the HOT and Reg. and see if it blows the HOT back > > up! > >> (I was young...What can I say) > >> > >> Good luck, God Bless > >> Bill McFarland > >> DMC Electronics > >> Salt Lake City, Utah > >> > >> ----- Original Message ----- > >> From: Dennis Viereck <wa6ati@xxxxxxxxxxxxxx> > >> To: <techassist@xxxxxxxxxxxxx> > >> Sent: Saturday, January 19, 2002 8:37 PM > >> Subject: [TechAssist] Re: MAG: 25X6 chassis Quick Question? > >> > >>> > >>> Opps... I can't read.... Never mind. You might be right...... > >>> Dennis Viereck > >>> > >>> Dennis Viereck wrote: > >>> > >>>> Depending on how the STR is shorted, I would the think the set would > >> still > >>>> run. Assuming the AC line voltage is reduced enough to achieve 130VDC > > at > >> the > >>>> output of the regulator. This is a simple linear regulator and easily > >>>> bypassed. > >>>> > >>>> A "Shorted" STR certainly would not point me in he direction of the > >> flyback. > >>>> Maybe if you had a shorted horizontal output transistor, I might feel > >>>> inclined to agree with you. But certainly not on 1 shorted part and > >>>> intestinal feelings...... > >>>> > >>>> Dennis Viereck > >>>> > >>>> Bill McFarland wrote: > >>>> > >>>>> Hello all, > >>>>> > >>>>> I am working on a 25X6 Maggot-box. > >>>>> > >>>>> Shorted HOT, Bad STR30130 Regulator. > >>>>> > >>>>> My gut tells me the flyback is probably bad as well. > >>>>> > >>>>> Can anyone tell me if the Flyback is a common failure item in this > >> unit? > >>>>> > >>>>> Good luck, God Bless > >>>>> Bill McFarland > >>>>> DMC Electronics > >>>>> Salt Lake City, Utah > >>>>> > >>>>> ------------------------------------------ > >>>>> Make your TechAssist database better! > >>>>> Submit Repair Tips here: http://www.tech-assist.org/secure/tip/ > >>>>> ------------------------------------------ > >>>>> To UNSUBSCRIBE your email address, click here: > >>>>> mailto:techassist-request@xxxxxxxxxxxxx?subject=unsubscribe > >>>>> Or send a BLANK email with unsubscribe in the > >>>>> SUBJECT field to the address above. > >>>> > >>>> ------------------------------------------ > >>>> Make your TechAssist database better! > >>>> Submit Repair Tips here: http://www.tech-assist.org/secure/tip/ > >>>> ------------------------------------------ > >>>> To UNSUBSCRIBE your email address, click here: > >>>> mailto:techassist-request@xxxxxxxxxxxxx?subject=unsubscribe > >>>> Or send a BLANK email with unsubscribe in the > >>>> SUBJECT field to the address above. > >>> > >>> ------------------------------------------ > >>> Make your TechAssist database better! > >>> Submit Repair Tips here: http://www.tech-assist.org/secure/tip/ > >>> ------------------------------------------ > >>> To UNSUBSCRIBE your email address, click here: > >>> mailto:techassist-request@xxxxxxxxxxxxx?subject=unsubscribe > >>> Or send a BLANK email with unsubscribe in the > >>> SUBJECT field to the address above. > >>> > >> > >> ------------------------------------------ > >> Make your TechAssist database better! > >> Submit Repair Tips here: http://www.tech-assist.org/secure/tip/ > >> ------------------------------------------ > >> To UNSUBSCRIBE your email address, click here: > >> mailto:techassist-request@xxxxxxxxxxxxx?subject=unsubscribe > >> Or send a BLANK email with unsubscribe in the > >> SUBJECT field to the address above. > > > > ------------------------------------------ > > Make your TechAssist database better! > > Submit Repair Tips here: http://www.tech-assist.org/secure/tip/ > > ------------------------------------------ > > To UNSUBSCRIBE your email address, click here: > > mailto:techassist-request@xxxxxxxxxxxxx?subject=unsubscribe > > Or send a BLANK email with unsubscribe in the > > SUBJECT field to the address above. > > > > ------------------------------------------ > > Make your TechAssist database better! > > Submit Repair Tips here: http://www.tech-assist.org/secure/tip/ > > ------------------------------------------ > > To UNSUBSCRIBE your email address, click here: > > mailto:techassist-request@xxxxxxxxxxxxx?subject=unsubscribe > > Or send a BLANK email with unsubscribe in the > > SUBJECT field to the address above. > > > > -- > From: Ed Gaidies > teltek@xxxxxxxxxxx > Tel-Tek Electronics > > ------------------------------------------ > Make your TechAssist database better! > Submit Repair Tips here: http://www.tech-assist.org/secure/tip/ > ------------------------------------------ > To UNSUBSCRIBE your email address, click here: > mailto:techassist-request@xxxxxxxxxxxxx?subject=unsubscribe > Or send a BLANK email with unsubscribe in the > SUBJECT field to the address above. ------------------------------------------ Make your TechAssist database better! 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