Replaced the capacitors on the dm board that was suggested as well as the other two circuit boards the clusters of four. The (2) 3300 10v on the power supply board were also replaced. The TV turned on and still have the same problem, the lighting is very dim. What is my next step? Could it be my ballast, light engine? The TV does'nt turn off and no light comes on indicating any problem. Cleaned lenses and mirrors replaced lamp. Hope you can help. Thanks
There are 2 mirrors in this set. the small mirror located in front of the lense is the most important. it collects dust and grime.clean it thoroughly.not only will this dull your picture it can also cause small blotches in your pix usually noticed on light colored scenes.
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Try Going To The Mitsubishi Web Site. Downloading The Mitsubishi Service Manuals If You Don't Already Have It. It Will recommend The parts You Need To ordering. Circuit board photos are also shown which provide a visual reference during the repair process.
If you decide to have a service technician do the repair, insist that the "DM" module is removed from the TV and ONLY the four 1000uF, 16V Capacitors (Caps) located on the DM Module are replaced. MOST techincians will INSIST on replacing the entire DM Module and not simply the capacitors. The cost is about $200 for a technician to replace the capacitors and $1000 for replacement of the DM Module. As you will read below, doing the repair yourself will cost less than $4.00 for the 4 Caps.
Once you take the shield assembly off, you will see a board, I believe it is the DM Board board. There are four Capacitors grouped together probably rated at 35v 1000 mfd, 105 degree. They should be replaced with 35v 680mfd,105 degree Capacitors. Now once that is done, there is another board under that one. This is the Format Board. It also has 4 Capacitors that should also be replaced. They are the same value as the first Board and should be replaced with the same 35v 680mfd, 105 degree Capacitors.
Please note the Flex connectors at the bottom of the DM and Format Boards. They may not be available from Mitsubishi any more so be gentle with them and make sure the are installed properly when reinstalling the Boards back into the chassis. There is one other Board you should look at. The Power Supply Board is the board on the back of the chassis and also has a number of Capacitors that fail. Most all of the Capacitors that fail through out this chassis will have bulging tops. So any you see bulging, you should replace whether they are on the DM, Format , or Power Supply.
I hope this helps,
It's definitely the one causing the problem but I suggest you also replace or resolder the 4 capacitors on the DM board to make the job at once. Just make a note on the polarity markings of the capacitors and the board. If there's no indicated polarity markings on the board then nevermind. Here's what you need to do the job:
Heat up the soldering iron
Melt the lead on the board with the soldering iron and use the desoldering pump to remove it and loosen the terminals of the capacitor.
Remove and replace the capacitors one at a time to avoid confusion.
Make sure to make a good solder. A good solder is volcano-shaped.
Cut any excess lead terminals.
Make sure there's no stray leads that might cause short circuit on the board.
Check the terminals of the newly installed capacitors for any short circuit.
Tip: The board experiences vibrations during the operation of the unit. These vibrations can result to broken solders as the time passes by. Before re-installing the board, check it for any loose or broken solders and resolder as a preventive measure. A magnifier will surely help.
It sounds like the capacitors inside the DM board is going bad or there is a problem with the FMT or formatter board. The DM repair will require replacement of four capacitors and if not done right away, the problem will get worse and burn out the IC's inside the DM and the DM will cost about 1000 bucks to replace! Good luck
The DM board is the one with the digital connectors on the back panel. If you already have it appart, you may as well check the caps on all of the boards. The caps that go bad are typically Jamicon brand caps in 1000 uF and 330 uF values. There are also a couple of 3300 uF caps in the PS that cause problems.
This part will cost you about 650 to 800 bucks my friend. if you have any soldering skills, and can follow directions, I posted a DM board fix. it may just be four small capacitors. Now this set that was used in the fix is not exactly like all the other Mitsubishi TV sets that still have a DM board, but if you can locate the DM board, follow the rest of the repair. if you do not know how to solder, do not take a chance, as this part is way too expensive to be experimenting around with. Get the Capcitors(there is a link there too for the capacitors)and take the DM board to a service shop, as this should not cost you a lot to have a pro do this for you. The DM board fix is located here: