Usually shorts. I like to compare the suspect FET with a new one, measuring with my Fluke multimeter. Gary McCartney McCartney Electronics Guelph Ontario Canada Est. 1984 email: gary (at) number63.ca David Lessard wrote: > I hope this doesn't come off sounding like stupid questions. I've always > been told no questions are too stupid so here it goes. When the main > drive FET in a SMPS goes bad do they usually open or short? What is the > most reliable method of testing a FET? Thanks. > > David Lessard > Mr_fixit@xxxxxxxxxxxx > Alexandria, Ontario, Canada > K0C-1A0 > > -----Original Message----- > From: techassist-bounce@xxxxxxxxxxxxx > [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Tel-Tek > Electronics > Sent: Tuesday, July 19, 2005 7:28 AM > To: techassist@xxxxxxxxxxxxx > Subject: [TechAssist] Re: Toshiba DVD/VCR Deck - Dead After Storm > > David... > Need a Model Number. > Biggest thing to go on these, small diodes in the Primary of SMP's. Also > a > couple of 1 Meg 1/4 watt resistors in series, which I think they have > changed to a single 2 meg. > But without a Model Number...not sure. > > > > -Ed- > Tel-Tek Electronics > Ontario-Canada > > teltek3@xxxxxxxxxxxx > ----- Original Message ----- > From: "David Lessard" <mr_fixit@xxxxxxxxxxxx> > To: <techassist@xxxxxxxxxxxxx> > Sent: Monday, July 18, 2005 9:58 PM > Subject: [TechAssist] Toshiba DVD/VCR Deck - Dead After Storm > > > >>This unit was manufactured November 2004. If the customer brings this > > to > >>an authorized Toshiba shop will it be repaired under warranty or will >>the shop know the SMPS (and whatever else) was damaged by a power > > surge > >>rendering the warranty null and void? Does it matter how the damage >>occurred while under warranty? I know there is the obvious, i.e. > > peanut > >>butter sandwich inside. Does anyone have access to the above > > schematic, > >>if it's available please send it along. BTW SMPS is dead; I mean > > really > >>dead, there are no pulses at the gate of FET, nothing. I hate SMPS's, > > it > >>seems that's all I do lately. >> >>David Lessard >>Mr_fixit@xxxxxxxxxxxx >>Alexandria, Ontario, Canada >>K0C-1A0 >> >> > > ------------------------------------------------------------------------ > ----- > >>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/ > > > ------------------------------------------------------------------------ > ----- > 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/ > > ----------------------------------------------------------------------------- > 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/ > ----------------------------------------------------------------------------- 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/