A couple of weeks ago you helped me. Now I have another problem. I changed the IC's and a 5 amp Pico fuse. Everything was working great, until tonight. The tv shuts off again. It's acting like the Pico fuse is blown again. What would cause this and how can I fix it? Mitsubishi WS65809. Thanks Jim
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There are some relays located in the fuse box under the hood.( Drivers side, located directly in front of the power booster for the brakes. open the lid & you will find 2 rows of fuses & 5 relays) you will have to refer to the owners manual for the diagram for the electrical fuses & relays.
There are two 5 amp pico fuses on the same board as the IC the board location jmbers are f(A04 and F9A05 they are solid green and look like a resistor without color bands.
The most common reason for this is one of the 2 pico fuses that protect the convergence circuit is blown. Changing the fuses will not help! They are green in color and soldered into the middle circuit board and are F9a04 and F9a05----look like resistors but are 5 amp fuses.
99% chance if one or both are blown---you have to have someone change the STK-393-110 convergence IC that this set uses----the IC can be purchased on Ebay for under 14 dollars and the same seller sells the pico fuses 5 @ 2.95.
The best thing to do here if you or someone you know is able is to unplug the set and look for the fuses---middle board towards the back---there are 5 of them and the two closest to the back of the row are for the convergence IC----If someone checks them (like testing any other fuse) you will know--if either or both is blown--the convergence IC got them.
I have start to finish, step by step instructions and photos of the fuses etc----If you or someone you know can solder and is handy--you may be able to do the repair yourself.
If not, shops usually charge 300-400 for this kind of repair in this set.
did you check the six 3.5 pico fuses that are next to the ICs? They will often be open ( blown) when the ICs fail. Also check the two 5 amp IC protectors on the G board as those protect the two ICs so its possible they have blown also a 5 amp pico can be substituted for the two IC protectors.
The only items on your set that should need replacement would be both convergence IC IC801 and IC802 which are both STK392-570 and you will also need to change the two 5 Amp pico fuses which are F9A04 and F9A05 they are both % amp pico fuses. All parts are located on the center Board
the bridge rectifier is most likley shorted in the amp.you could repair yourself if you can solder but amps are cheap today and you might just look into replacing it.please rate my solution.
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