Hi Paul, Thanks. I checked the original resistors (one was marked 360k, not 380k) and these 2 checked OK before the transistor blew out again. Is there supposed to be a 380k also? (maybe I missed that one). Bil PC 1000 M-Pulse 5000 magnetic pulse generator http://magpulser.com Mammoth Lakes, CA 760-924-1000 Friday, July 29, 2005, 6:20:37 AM, you wrote: PW> Bil, PW> Check for an open R14146 (380 k) or R14145 (270 k) PW> If these are bad, the MOSFET will literally explode when the set is plugged PW> in. PW> HTH PW> Paul Westcott PW> Kingsway Electronics PW> 1090 Kingsway PW> Sudbury, Ontario PW> Canada PW> Phone 705 566-9290 PW> Fax 705 566-5349 PW> westcott@xxxxxxx PW> ----- Original Message ----- PW> From: "Bil Green" <tv.vcrrepair@xxxxxxxxxxx> PW> To: ".TECHASSIST @ freelists . org" <techassist@xxxxxxxxxxxxx> PW> Sent: Friday, July 29, 2005 4:30 AM PW> Subject: [TechAssist] Power MOSFET - Huge Flash >> I replaced a shorted MOSFET (driver in SMPS) and other parts >> (listed below) and as soon as the set was plugged in there was a >> huge flash (arcing) observed at the MOSFET and it shorted >> immediately. >> >> There is carbon between the metal clip and the plastic front (not >> the backside, and there is no crack visible in the plastic) of >> the MOSFET. I don't want to power it up again until I have a clue >> as to what is likely causing this (the original one didn't do >> this). >> >> I did use a TDA4605-2 (instead of -3) for U14101, and I can't >> imagine this caused enough voltage (thousands?) to create this >> large arc. >> >> With less AC voltage the set probably won't start so I rather not >> use this method. >> >> RCA PTV >> model P61929 >> chassis PTK195ST >> >> Q101 (MOSFET) shorted >> U14101 melted >> R14125 burned >> >> Replaced 3 other resistors as recommended (checked OK) >> >> Bil >> >> PC 1000 >> M-Pulse 5000 magnetic pulse generator >> http://magpulser.com >> Mammoth Lakes, CA >> 760-924-1000 >> >> -------------------------------------------------------------------------- PW> --- >> This Email List is Public. Remove: http://www.tech-assist.org/remove.htm >> Set Vacation PW> mailto:ecartis@xxxxxxxxxxxxx?subject=set%20techassist%20vacation >> Lost Password: http://www.tech-assist.org and select "Login Problems?". >> Email Archives: //www.freelists.org/archives/techassist/ >> PW> ----------------------------------------------------------------------------- PW> This Email List is Public. Remove: http://www.tech-assist.org/remove.htm PW> Set Vacation mailto:ecartis@xxxxxxxxxxxxx?subject=set%20techassist%20vacation PW> Lost Password: http://www.tech-assist.org and select "Login Problems?". PW> Email Archives: //www.freelists.org/archives/techassist/ ----------------------------------------------------------------------------- This Email List is Public. Remove: http://www.tech-assist.org/remove.htm Set Vacation mailto:ecartis@xxxxxxxxxxxxx?subject=set%20techassist%20vacation Lost Password: http://www.tech-assist.org and select "Login Problems?". Email Archives: //www.freelists.org/archives/techassist/