There is a HV Regulator circuit on this model which uses T5A00 and Q5A08/Q5A05 to control Pin 2/3 input. 135V line goes thru Pin 1/4 output, adjusting input current controls output current allowed thru. Pin 5 Of IHVT is sampling output to Q5A03 and Q5A04 HV Buffer, 20.5 V on 03's base, 19.5 on 04's emitter, goes to IC5a00 pin 7 9.3V and out pin 8 2.4v to base of Q5a08, Q5A05 is overvoltage protect for A08. Pin 2 of IHVT is regulated side of 135V line. Damon Brunger damon101@xxxxxxxxxxxxxx Telrad Electronic Services Ft Wayne, IN 46815 ----- Original Message ----- From: <dennis@xxxxxxxxxxxxxxxxx> To: "Tech Assist" <techassist@xxxxxxxxxxxxx> Sent: Friday, January 24, 2003 12:15 AM Subject: [TechAssist] Mitsubishi VS-4543R > hello, good day, > > i would like to inquire about this unit VS-4543R the picture is blooming, or the picture is expanding unevenly, i have tried to check B+ but its normal 135V, my suspect is the high voltage are increasing, > > what are the possible defective parts? any suggestions. > > thank you > > Dennis Co > dennis@xxxxxxxxxxxxxxxxx > > ------------------------------------------ > Submit A Repair Tip For Everyone Here: > http://www.tech-assist.org/secure/tip/main.html > ------------------------------------------ > To REMOVE your email address, click here: > http://www.tech-assist.org/unsubb.html > To CHANGE your email address, click here: > http://www.techassist.net/forms/change.html > > ------------------------------------------ Submit A Repair Tip For Everyone Here: http://www.tech-assist.org/secure/tip/main.html ------------------------------------------ To REMOVE your email address, click here: http://www.tech-assist.org/unsubb.html To CHANGE your email address, click here: http://www.techassist.net/forms/change.html