Question about Sony Grand WEGA KDF55E2000 55" Projection HDTV
Solution from Sony - The 10.5V source from the main switching supply generated on the G board is monitored for under-voltage. The circuits monitoring this voltage line are located on the B board. This symptom is usually caused by a failure of the main switching regulator to run, such as a main converter or main relay failure. The most common cause of this event is the thermal fuse opening on the lamp chamber housing which causes a loss of STBY5V to the main relay. The presence of 5 volts on both pins of the thermal fuse should always be checked before replacing the G board.
The PROPER way to replace the thermal fuse is to remove the optical block first. There are at least two recessed screws holding the block in place. BE VERY CAREFUL removing the block as it is very easy to tear/rip wires when doing so. I cannot emphasize enough NOT TO JUST THROW THE NEW THERMAL FUSE INSIDE THE CABINET!!!! The thermal fuse is a safety device mounted near the lamp to prevent overheating. Those that choose to just let the fuse "sit out in the open air" are risking greater failures and the possibility of fire.
The correct Thermal Fuse part number for this Model is - 157695111.
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Posted on Aug 27, 2010
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Posted on Jan 02, 2017
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