I don't remember for certain. The 2SKs probably. I think the power supply was built on the main board to the front of the HOT. I saved the parts in a bag for future use and here's the list: 2 2SK2640-010MR 1 2SD2634-YB 1 IC MCZ3001D 1 100k resistor to be added as a modification. R651 They didn't tell me to order the IC. I got it just so I wouldn't have to pay shipping on it later by itself. Russ Hoyt Hoyt's TV Exeter, NH ----- Original Message ----- From: "Paul" <dntwntv@xxxxxxxxxxxxx> To: <techassist@xxxxxxxxxxxxx> Sent: Monday, October 03, 2005 1:49 PM Subject: [TechAssist] Re: Sony KV27FS100L > Russ > That is an interesting situation. Do you remember if the power supply in > the Sony had two switching mosfets or not? > Paul > Hoyt's TV <hoytstv@xxxxxxxxxxx> wrote: > Paul, Try disconnecting the anode lead and see if it will run. > > I had a KV24FS100 that I repaired the power supply and replaced the HOT > and > it would then fire up to a lower than normal HV for a few seconds and go > into shutdown. After a conversation with the Sony Tech at Fultons and > doing > the testing he recommended, we decided it needed a HO Transformer even > though it rang OK. > > I put that in and it still did the same thing. That's where the customer > said "uncle" and I quit working on it. > > A few weeks later I got in a JVC (I think) that was doing the same thing > but > the power supply was OK. The H wave forms looked exactly the same as what > the Sony tech said indicated a bad IHVT. The two transformers appeared to > be > identical so I put in the new Sony one and got the same results. > > For some reason I decided to hook the chassis up to my test jig to see > what > would happen. It worked fine on the test jig. I plugged the factory yoke > back in and it still worked fine and stayed on, without any vertical > deflection on the test jig of course. But when I hooked it back up to it's > own CRT it went into shutdown. I unhooked the anode lead and it kept > running. So there must have been an anode short in the CRT. > > I never tried the Sony again to see if it had an anode short because I had > removed all the power supply and HV parts when I quit working on it. > > > Russ Hoyt > Hoyt's TV > Exeter, NH > > > ----- Original Message ----- > From: "Paul" > To: > Sent: Friday, September 30, 2005 2:27 PM > Subject: [TechAssist] Re: Sony KV27FS100L > > >>I don't think the vertical I/C that I replaced was bad. The problem seems >>to be that the B+ never gets up to 135v. It makes about 47v then shuts >>down >>and goes into standby. I found a dual diode that was shorted in the >>secondary but it supplies the audio amp and removing it did not make any >>difference in the low B+ problem. Unless the secondary needs an exact load >>in order to run, I am at a loss to know what is going on. >> Paul >> Wayne Vanaman wrote: >> I have seen a number of sets that, when the vertical IC fails it takes >> out the video processor. Check for vertical drive out of the processor. >> Pins 28 and 29. These are complimentary sawtooth waveforms, about >> 1.2v pk-pk. >> >> Wayne Vanaman >> Omega Electronics >> 6904 W Fairfield Dr >> Pensacola, Fl. 32506-3310 >> >> Wayne@xxxxxxxxxxxxxxxxxxxxx >> WWW.PensacolaTVRepair.Com >> >> 850-456-5995 voice >> 850-458-6369 fax >> >> >> Leonard Caillouet wrote: >>> Four blinks can be either vertical or horizontal or something else that >>> causes the vertical output to not work. >>> >>> Leonard Caillouet >>> Service Manager >>> Electronics World >>> Gainesville, FL >>> >>> ----- Original Message ----- >>> From: "Paul" >>> To: >>> Sent: Thursday, September 29, 2005 8:39 PM >>> Subject: [TechAssist] Sony KV27FS100L >>> >>> >>> How reliable are blink codes? This set is becoming more of a problem >>> than >>> I >>> first thought. The blink code is four, indicating a problem in the >>> vertical >>> circuit, as I suspected before getting the service manual. I replaced >>> the >>> vertical I/C as the most likely cause per the self diagnostics. Problem >>> remains, that being the set tries to start but never makes enough B+ and >>> goes into stand by. I removed the HOT and replaced both switching >>> mosfets. >>> Nothing has changed. I have checked the lytics in that circuit, and >>> supply >>> resistors. Nothing shorted or low to ground on the B+ line.Haven't found >>> anything bad yet. When I took the back off and saw that the chassis was >>> the >>> one that has bad tact switches I headed there first. Anyone familiar >>> with >>> this chassis and this problem? >>> Paul >>> >>> >>> Paul ,B >>> Central TV&Video >>> 911W Grand Ave >>> Grover Beach Ca. >>> (805)481-8084 >>> >>> ----------------------------------------------------------------------------- >>> This Email List is accessible to the general public through search >>> engines. >>> 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 accessible to the general public through search >> engines. 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/ >> >> >> >> Paul ,B >> Central TV&Video >> 911W Grand Ave >> Grover Beach Ca. >> (805)481-8084 >> >> ----------------------------------------------------------------------------- >> This Email List is accessible to the general public through search >> engines. 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 accessible to the general public through search > engines. 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/ > > > Paul ,B > Central TV&Video > 911W Grand Ave > Grover Beach Ca. > (805)481-8084 > > ----------------------------------------------------------------------------- > This Email List is accessible to the general public through search > engines. 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 accessible to the general public through search engines. 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