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Rear projection mitsubishi vs5042 no high voltage

Concentrating on power supply.pcb-dbf board. Everything seems to be okay by that I mean voltages on transitors up to dbf drive transitor. At this point have 5.08 volts on base, calls for 5.3v, have 5.7v on emitter calls for .7v, have 2.7v on collector, calls for 5.9v. Have checked resistors and caps in vicinity. They seem to be okay. Have desoldered and checked to make sure. Other two high voltage transistor values following way off. These are designated dbf drive transistor also. One has values of 11.50v on base calls for -571v has ll.o8 on emitter, calls for -570v has 840v on collector calls for .2v. Other drive transistor has 2.5v on base calls for .7, has 2.4v on emitter has 2.4v has 10.96v on collector, calls for 10.6v. The dbf output transistor has 837v on base this connector to collector of other drive trans.supposed to be .2v, collector has1060v, supposed to be 522v, 0v on emitter. All of these transistors have been removed and checked via diode test. Seem to be okay. I'm an amatuer with enough knowledge to be dangerous. Everyone tells me to pitch this tv because its obsolete but I want to fix it.

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Are you talking about the LV power supply or the HV power supply? The terminology your using is related to the horiz drive circuit. Have you checked the B+ off the regulator which should be about 120v or, it will on the pc bd for the correct voltage. Do you have sound? If you do then you will have to use use your scope to see if you have proper drive at the base of the Horizontal Output Transistor. Then we can go from there. Oh, by the way I can tell by the voltage readings you stated both of those transistors of turned off.

Posted on Feb 21, 2009

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paniaqua1168,

This could truely be anything. I have a tip at http://www.fixya.com/support/r4425498-basic_standard_tv_troubleshooting which could help solve your problem. If this does not I also have a tip at http://www.fixya.com/support/r4425451-when_you_turn_your_television_on_and_get which concentrates on troubleshooting the high voltage power supply.

Thanks for using FixYa and for the great rating!!

hardrocko

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1 Answer

VS - 5043


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