Question about Mitsubishi WS-55807 TV

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My Mitsubishi WS 55511 died.

My Mitsubishi 55" TV died. No sound, no picture, nothing. It's dead as a doornail. Its only 4 1/2 years old. Any suggestions?

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If you are lucky, it's only a blown fuse. Some tv's this large have more than one fuse, so look real hard and find all fuses. If fuses are good, then about 95% of the time, when you have no picture/no sound, the problem is a bad H.O.T. This is a large transistor with three pins soldered into the main board and is very easy to find because it is connected to a metal "heat sink". Look for a large red or black wire coming from the pic tube down to the main circuit board (sometimes it's blue, but it's the only wire coming from the GLASS part of the tube to the board. This wire goes to about the largest component on the board called the "flyback transformer". It is usually black and is about 3 or 4 inches tall, 2 inches wide, and 2 inches thick. The h.o.t. will usually be located in the area of the "flyback". The h.o.t. will be screwed with one screw or clamped onto a large piece of metal (usually silver). This piece of metal is usually about 2 inces square and is about 1/8 of an inch thick and is mounted perpendicular to the main board. Imagine a slice of bread standing on one side rather than lying flat and this is what the heat sink looks like. Sometimes you will see several heat sinks with transistors screwed into them, but the one you are looking for will always be the largest transistor with three pins. Don't forget to unplug the tv before you begin and stay away from the large wire coming out of the tube going to the "flyback". Do NOT unplug this wire from the tube. It can shock you very badly EVEN WITH THE TV OFF FOR SEVERAL DAYS. Just be careful and go ahead and give this a try. You can do it, and this is probably going to fix your set. If not, then replace the flyback transformer. The H.O.T. is about $10 or $15 and the flyback can be from $30 to $80. It is possible that none of this will fix your set, but you have about a 95% chance that it will and with such a big and nice and relatively new set, I would give it a shot. Keever

Posted on Mar 04, 2008

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Good Day;

It sounds like your TV is experiencing a CONVERGENCE CIRCUIT failure. YES, it is worth repairing, it's a great TV. The cost will be from $450.00 to $650.00; call an Authorized Service Center and have them give you an estimate B4 repair. Good luck, big IRISH. PS: It's Not An Easy repair to do your self.

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Hi there!
The fuse may have blown. If so and you know how to check for a faulty fuse inside a TV, it may be worth a shot. Please unplug before opening and replace fuse with same value. If it blows again, you have to have it seen to by a repair technician. Good Luck, Regards, JUS004

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The convergence ICs probably have a cracked solder joint on the foil side of the circuit board. Re-flowing the the solder would help. I will always replace the convergence ICs when doing this job. The labor remains the same and you will have to pay a few extra bucks for the parts. To fix this yourself, you will need to be able to identify the two convergence ICs (STK392-570), have a basic knowledge of electronics and be able to use a soldering iron.

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Very common problem Its the convergence IC's in the set and are not cumseumer replaceable unless you know your way around the inside of a tv set. Theres way to much Hi voltage inside these sets tp tinker around with them . This repair should only be done by a qualified technician, as it probably will need a good alighnment after the ICs are replaced . Should cost about 3 to 4 hundred bucks to have fixed. Good Luck

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