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" <dntwntv@xxxxxxxxxxxxx> > To: <techassist@xxxxxxxxxxxxx> > 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/