Yeah that's what I meant, If that ic601 is blowing, I'm pretty certain you're going to find your duty cycle off, It'll kill it if it's off more than 1%. Damon Brunger damon101@xxxxxxxxxxxxxx Telrad Electronic Services Ft Wayne, IN 46815 ----- Original Message ----- From: "Rochester Electronics" <pasthecash@xxxxxxxxx> To: <techassist@xxxxxxxxxxxxx> Sent: Saturday, January 05, 2002 9:28 AM Subject: [TechAssist] Re: Sony kv32s45 blows R607 no power > > Thanks damon, > I don't have a variac but i just ordered one, ill have it > on tuesday. When you say q601 do you mean ic601? this set > does not use the standard q601 and q602 that we are all > familliar with. Insead it uses an ic MX0841 for the reg. > Please advise, > > Thanks > Mike > > > > --- Damon <DAMON101@xxxxxxxxxxxxxx> wrote: > > > > Ok, do you have a Variac?? You'll need it for this. > > Replace blown parts and > > install variac - set it to 30 volts ac and turn it on. I > > suspect that using > > a scope on the Q601 E-C connection point that you will > > find the duty cycle > > (turn-on vs turn-off) to NOT be 50%. > > > > Check the resistors connected to the Base pins, diodes > > @caps too. (Don't > > have my schematics in front of me). These set the timing > > of the Ic's duty > > cycle. Of course you may also have NO oscillation at all > > and one side of > > q601 is being turned on all the time, if so then the > > tuning caps for the > > Pit, Prt, or Smps xfmr come into question, (Remember, no > > schems in front of > > me). > > > > But that situation will kill q 601 immediately. Hope this > > helps. > > > > Damon Brunger > > damon101@xxxxxxxxxxxxxx > > Telrad Electronic Services > > Ft Wayne, IN 46815 > > ----- Original Message ----- > > From: "Rochester Electronics" <pasthecash@xxxxxxxxx> > > To: <techassist@xxxxxxxxxxxxx> > > Sent: Friday, January 04, 2002 11:56 AM > > Subject: [TechAssist] Sony kv32s45 blows R607 no power > > > > > > > > > > Hi guys, > > > hope someone can help with this one. > > > Sony KV-32S45, came in for no power up. found open R607 > > on > > > power supply (G Board) and didn't find anything els > > > suspect. > > > but changed the the regulator IC601 and the r607, > > removed > > > vdr602 and checked out of circuit it seems to be ok. > > > Checked the HOT in and out of circuit. checked d603 and > > > d604. all seems ok. > > > plug set in and imediatly blows R607. Thought i might > > have > > > a bad regulator so i changed it again just because i > > had > > > one. same problem. With the power supply unplugged > > fron > > > the rest of the set seems ok however i have no print. > > From > > > cn641 all i get is the standby 5v but i bet that it > > needs a > > > sygnal from the main board to set one of the relays. > > Not > > > sure where to go from here. Heeeelllllpppp... > > > > > > TIA > > > > > > Mike > > > > > > ===== > > > Mike > > > Rochester Electronics > > > 716-663-6870 > > > www.RochesterElectronicsRepair.com > > > > > > __________________________________________________ > > > Do You Yahoo!? > > > Send your FREE holiday greetings online! > > > http://greetings.yahoo.com > > > ------------------------------------------ > > > Help make your TechAssist database better! > > > Submit your fixes here: > > http://circuitwork.com/techassist/tip/#tips > > > ------------------------------------------ > > > 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. > > > > > > > > > > > > > > > ------------------------------------------ > > Help make your TechAssist database better! > > Submit your fixes here: > > http://circuitwork.com/techassist/tip/#tips > > ------------------------------------------ > > 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. > > > > > ===== > Mike > Rochester Electronics > 716-663-6870 > www.RochesterElectronicsRepair.com > > __________________________________________________ > Do You Yahoo!? > Send FREE video emails in Yahoo! Mail! > http://promo.yahoo.com/videomail/ > ------------------------------------------ > Help make your TechAssist database better! > Submit your fixes here: http://circuitwork.com/techassist/tip/#tips > ------------------------------------------ > 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. > > ------------------------------------------ Help make your TechAssist database better! Submit your fixes here: http://circuitwork.com/techassist/tip/#tips ------------------------------------------ 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.