Question about Mitsubishi WS-55859 55" Rear Projection Television
Replaced the 1000uF 16V caps on the DM board. Still same thing. Blinks green timer light for about 3 sec. than shuts off. I can hear a relay trip inside somewhere.
Same problem I am having....tech came out said it was probably the board containing the power source which on my tv is the right circuit board, said he would either have to buy complete board or get a refurbished one....probably about $400 bucks.
Posted on Nov 21, 2008
The clicking you hear is a relay that repeatedly connects,
then disconnects the AC to prevent fire or further damage.
If it just fails to turn on, the main power supply is probably at 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 supply still may not be at fault since most are capable of switching on and off if a downstream problem is causing an overload.
Posted on Oct 28, 2008
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Posted on Jan 02, 2017
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Feb 16, 2011 | Mitsubishi WS-55859 55" Rear Projection...
Thanks for using FixYa. Continuous blinking green LED on Mitsubishi's Projection which normally blinks after a power surge means that the microprocessors inside the unit are unable to communicate with each other. Usually Mitsubishi's Projection TV use 1000uF/16 in the DM MODULE (which is one of the two microprocessors), as these capacitors are too small for the load they get they usually fail usually after about 3-5 years. They might also fail due to voltage fluctuations. To resolve this issue these capacitors should be replaced with 1000uF/25 volt or 1000uF/35 volt capacitors, so that they can handle any voltage spikes that will occur. To do the repair you'll need to take the back off the TV apart in order to remove the faulty DM module and need to desolder the old capacitors on DM board and install new ones. All this is only recommended to be done by someone who has electrical expertise. Please rate the solution if the issue is resolved or post a comment for further assistance.
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