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Problem for Mitsubishi WS-73711 73 in. Rear Projection Television

Won't power up - Leakage Test - Mitsubishi WS-73711

By KariSue on Jan 07, 2008

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I've performed a leakage test by shorting the two prongs of the wall plug then measuring between the plug and metal parts on the TV. All but two of the metal parts (heat sinks, screws, plates...) read >1M ohm. The heat sink on two switching mode rectifiers measure about 20 M ohms. After I plug it in, most of the metal parts measure around 1-10 mV from ground (I don't recall if it was hot or cold ground). The two rectifier heat sinks measure around 26 mV. Would this indicate there is a problem with the rectifiers and should be replaced?

Currently, my Mitsubishi doesn't want to power up. I changed the DM cap's which got rid of the 'blinking green light' problem. However, it still doesn't power up. The error code (12) indicates the TV is operating normally. I removed the front panel power switch board and the on switch measures open/close/open when I depress it. I also checked all the fuses indicated on the inside of the chassis (about 10 of them). I measured the standby voltages from the test points and cold ground (6, 12, 28 and 32). If I remember correctly, I think they were all zero except the 6 volt was 7 volts - I will have to verify this. Tonight I will check the output of the bridge and switching rectifiers. However, I'm not real clear on what voltage they should be. I'm just learning about all this stuff - kind of fun - especially if I get it working!

Comments:

Jan 08, 2008

- TV WORKS NOW! I disconnected the front panel cable connector that goes to the power switch. The TV powered up fine using the remote. I need to recheck the power switch. It would appear it is stuck or something. Others have posted this problem keeps the TV from powering up by the front panel button or remote.

I picked this TV up for free on Craigs List a few days ago. Repair costs will be about $40 and I have a 73" TV that went for $7000 a few years ago. I couldn't have done it without all the great information from these tech support sites. You guys are great! Most important, this monster of a TV didn't end up in the landfill. How rewarding.

Jan 08, 2008

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Same Problem

Mar 08, 2009

- Tv won't power up with the remote or the front panel buttons. Pulled power for 12 hrs thinking TV would reset but nothing. What's next. - Guest

Solution #1

posted on Jan 08, 2008

troylove11

Rank: Wiz Televisions & Videos

Expert
Rating: 84%, 1306 votes

Well it sounds like you enjoy checking things, did you check D9A31 part# 264P045050 and R9A33 a 220 ohm 1/4 watt resistor on the PCB? Try this!

Troy

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