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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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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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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Amp keeps blowing fuses


Blowing fuses, was caused by many thing.
Short of rectifier,resistor,elco,tube heater,tube pin, and also trafo itself (primary or secondary winding). It must check step by step.
CAUTION :
THIS IS HIGH VOLTAGE AREA.
RISK OF ELECTRIC SHOCK THAT CAN KILL.
DON'T DO THIS IF YOU ARE NOT TECHNICIAN OR NOT FAMILIAR WITH VACUM TUBE CIRCUIT. THE CIRCUIT MAY STILL CONTAINS ELECTRIC SHOCK EVEN IF IF THE AMP IS NOT POWER PLUGGED.


The simple steps (see picture) are:
  1. Disconnect all connection from secondary of power trafo (PLV,PDCH,PACH and PHV).
    Power ON the amp. If fuse is not blowing,trafo is good.
  2. Power OFF the amp. Unplug the cord.
    Connect PLV1-PLV2-PLV3 (this are Bias voltage,+/-15VDC and Backlight PCB voltage) to power trafo.Power ON the amp. If fuse is not blowing,PLV circuit is good.If fuse blowing,there are parts is damage (dioda,elco,7815/7915,resistor) in this PLV circuit.
  3. If step 2 is good,go to next step.
    Power OFF the amp. Unplug the cord.
    With PLV circuit stay connected,connect PDCH 1-2 and PACH 1-2 to power trafo. Power ON the amp.
    If fuse is not blowing,PDCH and PACH circuit is good and all tubes heater/filaments are lights after a few seconds.
    If fuse blowing,there are parts is damage (dioda,elco,tube heater pins) in this PDCH/PACH circuit.
  4. If step 3 is good,go to next step.
    Power OFF the amp. Unplug the cord.
    With PLV,PDCH,PACH circuit stay connected,connect PHV 1-2 to power trafo.
    Power ON the amp. CAUTION: HIGH VOLTAGE AREA is ON.
    If fuse is not blowing,PHV circuit is good.
    If fuse blowing,there are parts is damage (dioda,elco,tube pins) in this PHV circuit.
.amp-keeps-blowing-fuses-01sk4vtrndbaaguwe2brflsj-5-0.jpg
Notes:
  • Steps had to be done sequentially from 1 to 4, not upside down.
  • If tube/heater pin is short,it can't be repair. The tube must be replacing.
  • PDCH circuit is voltage for V1-2-3-4 heater/filaments.
  • PACH circuit is voltage for V5-6-7 heater/filaments.
  • Always replace fuse with same type.

amp-keeps-blowing-fuses-01sk4vtrndbaaguwe2brflsj-5-1.jpg

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NUMARK DIMENSION 4 1900W blowing power cord fuse


This could be a faulty power cord, ie: two of the wires touching perhaps not visible to the eye. Or a short in the transformer or power supply. Check also internal fuse(s) if they have blown, suspect a faulty device in the power amp stage (on the heat sink) if they have gone too!

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1 Answer

How many amps is the fuse that is located on the back of the TV near the power cord. It says T5AL/125 or 250 v. f800


Something else is going on to cause the fuse to keep blowing. Sounds like you have an issue on your power supply in the unit. Also check the outlet that your plugging it in to. Good luck!

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I need to know the amp rating, on the fuse. And what to do, after I replace it, And you hear a sizzling and it blows the fuse again. The one I replaced had 5 amp. but not sure if it was a factory fuse. Or...


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1 Answer

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There is a short in either or both the main power supply or one of the scan amplifier sections and or the high voltage section.

You will not bel able to service this yourself. This type of repair can be fairly involved and complicated to troubleshoot.

An expericed TV tech should be able to service this for you.

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The first thing is to check to see if the fuse is blown,if so replace with a 5 amp fuse,fuse is located near were the power cord connects to the board,make sure set is disconnected from power.

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