Question about Mitsubishi VS-50607 50" Rear Projection Television

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Instantly blows the 5 amp fuse next to the power cord plug.

Started out with an intermittent picture and sound. When the picture and sound went off I could still get the pip to work on the right side only. Next it turned off and wouldn't turn on. I found a blown 5 amp fuse next to where the power cord plugs in. When i replace it and plug it in it instantly blows the fuse.

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Re: Instantly blows the 5 amp fuse next to the power cord...

You probably had a voltage surge. Most sets have a component called a varistor on the power supply board. If you pop off the back you should see this varistor near the fuse. I should look blown or brown or defective in some way. Varistors sense voltage spikes and fuse the positive and negative of the supply together to send the voltage spike back through the ground and save the rest of the electronics in the television, but this results in blowing the fuse instantly when you plug the set in. The varistor will most likely have a disc shape to it, and possibly a brown-orange color. Most of the time you can just cut out these components completely with a pair of wire cutters and the problem will be solved after you replace the fuse. Just make sure to plug the set in to a surge protector because the sensitive electronice inside the tv will no longer be protected from voltage spikes! Hope this helps!

Posted on Aug 08, 2007

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Re: Instantly blows the 5 amp fuse next to the power cord...

You have a short in the power supply. Look at the regulator and or rectifier diodes. These are all on th primary side of the SMPS (switched mode power supply) the secondary side if shorted shouldn't cause a blown fuse at all.

Posted on Mar 19, 2007

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Solved by resoldering some solder joints!!!!!!!
Toshiba Model 57H81 Rear Projection TV - Purchased 11-09-2001

Problem: Toshiba 57H81 Flashing Red Power Light, No Picture/Sound, Blown Fuses F850 + F852

Symptoms January, 2009:

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  • Removing plug for one minute and plugging in results in:
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    • Pushing power button results in steady red for about 2 seconds then slow flashing red light, no other set activity
  • Removing power cord for several hours and plugging back in made no change
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Repairs Made:
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    • There are two main power supply capacitors in this set. They are C-809 and C-810. One their negative lead on the printed circuit board re-soldered leads and nearby contacts. I’m told that because the factory left out a printed circuit board eyelet, the connection will come loose over time. When I called Toshiba customer service they said there was a known solder joint problem causing blinking red light.
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      • Used a fast blow 2 Amp for F852.
  • PD0073 SIGNAL Board
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    • Re-soldered adjacent pads that looks suspicious

Total Cost to Repair about $10
  • Twelve hours of my time over three days to research issue, disassemble set, make repairs, add fuse panel.
  • Already owned Service Manual and Circuit diagrams from a different 2004 repair.
  • Less than ten dollars at Radio Shack for fuses and fuse panel. Already had wires, etc.
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