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Likely the DMD unit which is part of the light engine--if have to unplug set the microprocessor is getting scrambled and cannot operate. Common and fatal issue as to replace the light engine the cost will exceed the value of this set---DMD can be purchased alone but costs almost as much as the whole engine that comes with it.
Seen several of these sets---a shame but even at wholesale the part to fix it makes it not worth fixing.
This means that the lamp, or the inverter for the lamp is just getting old and is "leaking" charge, eventually it will just turn off instantly and will no longer work. These are not cost effective to replace, you might aswell replace the whole thing!
Not that it is pertainent but it would be interesting to know which ICs you replaced and what caused you to suspect them; was the set dead before as it is now?
Generally, no video and no sound points to a power supply failure.
Sometimes they will get slow at turning on, and others may fail completely; these two failure types can indicate different failure modes.
The type of failure that causes hard-starting power supplies is often cheap to repair whereas a failure that suddenly occurs can be more costly and involving more labor to resolve.
Pasted below is my usual suggestion for suspected power supply failures:
--If it just fails to turn on, the
main power supply isprobablyat
fault and without some technical background and a couple of test instruments,
you will not be able to do the repair yourself. What you can do though is; unplug the set, let it
stand overnight or at least several hours, remove the back panel and look for a
separate board with mostly larger components on it; it will have a ferrite core
transformer on it and several larger capacitors which are cylindrical and
mounted vertically to the board. Before touching anything inside,
especially on that board, allow several hours to be safe since the larger
capacitors can hold a painful voltage charge for some hours. If you see signs of overheating
such as discoloration of the board material, it may not be repairable but if
you can find a part number on the board, you might be able to buy the power
supply and install it yourself. If there are no signs of heat
damage to the board, there may be companies offering to repair it as a
subassembly instead of repairing the whole set which could be much more
expensive. If you choose to replace or have it done, the power supplystillmay not be at fault since most
are capable of switching on and off if a downstream problem is causing an
I had the same problem with my TV, It seems the high voltage trasnformer blew which in turn casued the pin cushion?? to blow. It then shuts the tv off to prevent more damage to it.
$500 with service charges to get it fixed!