Question about Mitsubishi WS-73909 73" Rear Projection Television
We have a Mitsubishi WS-73909. Whenever our power goes out--even when the set is off--the blinking green light appears. We had this fixed a couple of years ago. Earlier in the summer the same thing happened. The local authorized Mitsubishi repair place replaced the controller/board, but still didn't work. This took many many weeks as the DM board was on back order.
After the board replacement didn't work, they then took the "guns" or lights back to their shop. When I called a few weeks ago, they indicated they still couldn't get anything to work and had concluded that the replacment DM board was bad. They indicated they would order another DM board.
When I called them today, they now indicate that Mitsubishi no longer makes that part. Ugh. They are looking for a board on the secondary market.
I also called Mitsubishi to see about a replacement part and to express my disappointment with this entire process, but I think that fell on deaf ears.
The four cap replacement in DM module repair is simplistic
and incomplete, as you found out. ALL defective DM modules
have bad SMC's ( small "top hat" caps) AKA surface-mount
capacitors that can be changed only by the most highly skilled
bench techs. We used to change out hundreds years ago in
camcorder circuit board repair.DM board repair is a much more
accessible,thus more "do-able". For more info.............T.
Posted on Nov 05, 2007
Your model will have two picos mounted on the same board with the 7 capacitors they will look like resistors without the color bands they will be F9B01 and F9B00 check them for continuity.
Posted on Jul 28, 2008
I have a mitsubishi 48" integrated 1080. The Timer green light keeps blinking. I have no picture. Can this be the fuse? My coworkers say this might be the problem. Can I replace it myself? If so, where is it located?
Posted on Oct 16, 2008
Not good news for you;
Mitsubishi TV assembly
Since this seems to be an entire board, I suspect that it may have failed and some devices on it may be proprietary making the repair impossible. The 'chip foundries' are capable of designing a complex integrated circuit in weeks and then giving it a unique part number that belongs exclusively to the company that designed it, making the part impossible to buy from a normal supplier.
If anyone is interested and junking this set due to the high assembly replacement cost, I'd like to get one of these to see if the board is repairable. It may have inexpensive components that have failed and can be easily replaced. I have the equipment and knowledge that would allow me to either repair it or at least judge its repairability. If you are interested, please email me at:
freetekATlycos.com (remove the 'AT' and replace it with the proper symbol.)
Posted on Oct 28, 2008
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