Mitsubishi offers an internet tech tips/support website accessible for an annual fee of $125.00($100.00 for renewal). Use it 2-3 times a year,and it's paid for itself.... email Peggy Bray...... pbray@xxxxxxxx Here's some tips from it for your model. Shutdown at power on....... 1. SHORT DETECT SHUT DOWN (PIN 15 OF IC700) CHECK FOR OPEN L902 PART # 351P070010 OFF Q904 C (15 V SUPPLY) ON THE MAIN PCB. 2. SHORT DETECT SHUTDOWN (PIN 15 OF IC700) CHECK FOR SHORTED D913 PART # 264P722010 AND OPEN Z901 PART # 283P039020 (Z905 AND Z900 MAY ALSO BE OPEN BECAUSE OF THIS). 3. X-RAY SHUTDOWN (PIN 55 OF IC700) CHECK FOR A LEAKY D5A09 PART # 264P244030 OFF PIN 6 OF IC5A01. 4. X-RAY SHUTDOWN (PIN 55 OF IC700) CHECK FOR LEAKY D5A21, PART # 264P045040, IN THE BEAM PROTECTION CIRCUIT ON THE MAIN PCB. 5. CHECK FOR LEAKY Q5A03 AND/OR Q5A04 BOTH PART # 260P559050, IN THE HIGH VOLTAGE DETECT CIRCUIT, ON THE MAIN PCB. 1. SHORT DETECT SHUT DOWN (PIN 15 OF IC700) CHECK FOR OPEN L902 PART # 351P070010 OFF Q904 C (15 V SUPPLY) ON THE MAIN PCB. 2. CHECK FOR LEAKEY D5A21, PART # 264P045040, IN THE BEAM PROTECTION CIRCUIT ON THE MAIN PCB 3. CHECK D5A09, PART # 264P244030 OFF OF PIN 6 OF IC5A01 ON THE MAIN PCB 1. CHECK FOR LEAKEY D5A21, PART # 264P045040, IN THE BEAM PROTECTION CIRCUIT ON THE MAIN PCB 2. CHECK PIN 6 OFF IC5A01 FOR 22.2 VOLTS DC IF LOW CHECK D5A09, PART # 264P244030 ON THE MAIN PCB. Peggs At 04:46 AM 1/24/06, Damon wrote: >R5a28's value may depend on the set itself....look at the parts list for >variations, if not there look at the LEGEND normally found on the specific >page OR the First page of the schematics. The legend will show how the >schematic's markings are used (ie 56 = 56pf and 5.6 = 5.6 uf) >They normally put notes about unknown values in there for a reason. > >Damon B >Telrad Electronics >Fort Wayne IN >----- Original Message ----- >From: "Paul" <dntwntv@xxxxxxxxxxxxx> >To: <techassist@xxxxxxxxxxxxx> >Sent: Monday, January 23, 2006 9:21 PM >Subject: [TechAssist] Re: Need VS-4544 schematic > > > > Tom > > The print does not give a value for R5A28 in the VS4544. It does give >a value of 39K for a VS 4545. The other side of that resistor goes to >cathode of D5A22. The anode of that diode goes to cathode of D5A21 anode to >ground. That diode may be shorted. I can copy this section and send it to >you if you want. > > Paul > > > > Tri-County Tv <tricountytv@xxxxxxxxxxxxx> wrote: > > Jeff, > > I have scoped the H.O.T collector and looks distorted , driver > > transistor output is clean , If I keep turning the set on , R5A28 starts >to > > burn, with is off the ACL line from flyback pin# 8 . I am not sure of the > > value of this resistor. It now measures about 65K. If pin 8 is the low >side > > of the internal HV diodes , then maybe I am dealing with a bad fly. I >think > > the burning of R5A28 should be clear clue as to where the problem is. I am > > still working without a schematic. > > Tom Berger > > Tri-County TV > > Robbinsville > > North Carolina 28771 > > Ph--828-479-6043 > > Fax-828-479-4868 > > (tricountytv@xxxxxxxxxxxxx) > > ----- Original Message ----- > > From: "Shoreline Electronics" > > To: > > Sent: Monday, January 23, 2006 12:27 PM > > Subject: [TechAssist] Re: Need VS-4544 schematic > > > > > Can you scope the collector at startup and see if the pulse is clean or > > > distorted? > > > > > > Keep in mind , these sets have a discrete Horizontal Output section and >a > > > HV > > > section. > > > > > > ========================== > > > Jeff Stielau > > > Shoreline Electronics Repair > > > 344 East Main Street > > > Clinton,CT 06413 > > > 860-399-1861 > > > 860-664-3535 (fax) > > > jstielau@xxxxxxxx > > > ======================== > > > > > > ----- Original Message ----- > > > From: "Tri-County Tv" > > > To: > > > Sent: Monday, January 23, 2006 12:18 PM > > > Subject: [TechAssist] Need VS-4544 schematic > > > > > > > > >> Hello everybody, > > >> I am in desperate need for a schematic and any > > >> repair tips for this old Mitsubishi Big screen. It shuts down at turn >on, > > >> and draws heavy current from H.O.T I suspect the flyback but it rings > > >> good > > >> so maybe a shorted internal high voltage diode. I have a feeling this > > >> will > > >> be very hard to find. I am ready to put a match to this dog! I think >the > > >> chassis is VZ3 Any help would be greatly appreciated. > > >> Thomas Berger > > >> Tri-County TV > > >> Robbinsville > > >> North Carolina 28771 > > >> Ph--828-479-6043 > > >> Fax-828-479-4868 > > >> (tricountytv@xxxxxxxxxxxxx) > > > >> ------------------------------------------------------------------------- >---- > > >> 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/ > > > > -------------------------------------------------------------------------- >--- > > 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/ ----------------------------------------------------------------------------- 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/