Where is the dm board located

well, I fix it my ws-55517 and I changed 4 capasitor from DM Board, numbers :C81..C81a..C82b...C81c....1000ufd,16v,105c

If you have a green blinking light,
Most likely issue is with bad capacitors on the DM an FMT boards.

1) Look for bad 1000uf 16v caps on the dm board and the fmt board.

2) checked surface mount fuses (small white boxes) on DM and FMT board

Look carefully for other bad capacitors in the general area.

Start here and let me know the results.

Note, there is a lot of disassembly to get to these boards. Not a fun project.

hi friend,
Repairing It Yourself
If you decide to repair the TV yourself, I recommend that you obtain a copy of the repair manual for your Mitsubishi TV from the Techlore website by going to Mitsubishi Service Manual. It will provide some direction, however it is technically written and may be difficult for the NOVICE to understand. If you are unable to locate the the service manual for your specific Model at the above Techlore link, you may need to purchase the service manual online at ServiceManuals.net.
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.
A Few "Cautions"

1. Keep yourself "grounded" when working with the circuit board. Static electricity will destroy electronic components.
   
2. When replacing the Capacitors, press them "down" onto the circuit board as far as they will go, hold them down, solder into place and clip the excess terminal lengths flush with solder. Only by doing this will the metal shield (little silver box) slide down and over the circuit board during re-assembly. There is not a lot of clearance when doing this, as the 105C Capacitors are slightly longer that the originals. With minimal effort everything does fit back together.
   
3. Use ONLY 105º C capacitors with a voltage rating of 35 V.
   
4. Re-insert the DM circuit board into the Mother board; press virmly and ensure a proper seat of the DM board. Next, slide the metal case down and over the DM circuit board. Refer to my "Lesson Learned."

Basic Troubleshooting

1. Press the "reset" button and hold for 10 seconds .... Does TV turn on and blinking green light turn to solid green.
   
2. Unplug the TV from it's power source for various times, ranging between 5 minutes and 24 hours..... Does blinking green light continue upon plugging in the TV.
   
3. Disconnect ALL devices from the TV; DVD, Tuner, Cable Box, unplug the TV for various duration times .... Does blinking green light continues upon plugging in the TV.
   
4. Press Power and Menu buttons simultaneously and hold depressed for 20 seconds .... Does blinking green light continue to flash.
   
5. Press Power and Display buttons simultaneously and hold depressed for 20 seconds .... Does blinking green light continue to flash.
   
6. Insure that no front panel buttons are inadvertently stuck in an "engaged" position.

Diagnosis: If none of the above test resolve the issue, then the failure lies in one of the following:

1. DM Module Capacitors have FAILED.
2. DM Module is defective.
3. EEPROM Board failure
4. Power Supply failure.

hope this helps u
please rate me.....................
thank u for using fixya
regards
sivaranjini

Very common and easy repair the DM capacitors need replacement. Heres a kit for your model the kit contains the capacitors and the instructions .
http://servicemanuals.vstore.ca/product_info.php/pName/v21v19-mitsubishi-dm-repair-kit/cName/repair-kits

replace the capacitors on the DM board. Heres a link to the repair kit which contains the replacement capacitors and instrucions of how to do the repair.
http://servicemanuals.vstore.ca/product_info.php/pName/v21v19-mitsubishi-dm-repair-kit/cName/repair-kits

had same problem with my tv.Technician told me to remoe front cover and unplug the 2 plugins going to the buttons then try the mistubishi remote to turn tv on.Did this and worked fine with remote.

You can go to this link they have the kits with the high temp higher volt capacitors and complete detailed instructions on how to do the repair.
http://servicemanuals.vstore.ca/

bad capacitors 1000uf on the PWB, FMT and DM boards will cause those symptoms. All capacitors 9 in all need to be replaced

the PWB , FMT and DM boards all have capacitor issuses with that chassis. If the power light is blinking there are 4 1000uf capacitors on the DM that need replacing. If you need more info let me know.