DM Power on problem - Can I use 35V Caps instead/ (Techman??)
I am following Techman's solution for the power light flash. I really don't want to wait for shipping on the caps. Can I use the 1000uf 35V caps that are available at Radio Shack? (Instead of the 1000uf 16V)
Thanks Techman for your solution and instructions. My TV failed today after a few days of flakey on/off issues.
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Thats a common problem if the sets left unplugged or without power the DM caps drain and then wont charge when the power is restored. Its a easy fix usually just replace the DM caps. You can get the Mitsunbishi repair kit called the WS55859 DM repair kit from www.tvrepairworld.com which has the upgraded replacement caps and the CD with repair instructions.
I used to have a WS55909 and had this problem. The light is supposed to blink for one minute while the DM (digital module) boots up after a power loss. If the light continues to blink indefinitely, there is a problem with that board. The DM power supplies are known to have faulty capacitors on these models and will need to be replaced. If I remember correctly, there are (7) 1000uf 25v capacitors and they should be desoldered from the board and replaced with 35v ones. Note that my TV model already had 35v caps but changing them solved the problem: electrolytic capacitors have a much shorter life than other components.
The DM is on the left side and is where ANT-DTV and the IR repeaters plug in. The power supply is the board above the main DM board inside the DM case. If this sounds too technical for you, get a new TV because a repair guy will charge you more than the TV is worth. In other words you could get a (30-46") LCD TV for the same price.
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,
I had the same problem with the blinking green light. These are the parts one the power supply I replace to repair it. note: If the power supply is repaired you will get a solid green light and the backlight will light up almost immediately.
oh yea don't try to look for a lamp in your tv set that has three crt's!
if you can solder and unsolder , then replace the four(4) 1000uf capacitors on the dm board , and make sure the new caps are 25v or 35v , also check fuses for the two STK 394-250 convergence IC's (ic8c01 , ic8c02 )( on the big heat sink ) , if they are blown then replace the convergence IC's also
here is the service manual that will help in dissasembly and locations of dm board and convergence IC's http://www.techlore.com/download/24849/Mitsubishi-WS-xxx13-Service-Manual/
If you only changed 4 caps,1000 ucfd 35v, it should be 5, if you did not remove the little plug in board, e prom, you may have damaged that. B-4/after changing caps what is the indicator light, green, doing?
If the light continuously blinks, there are four(4) caps, 10000upf @ 35v that are bad on the DM board. The board is on the right side of the chassis, looking from back, the caps will be swollen on the top. The repair is more cost effective then replacing the board.
http://www.chrisandnat.com/Projects/BlinkingTV/blink.htm http://www.jeremyburns.com/Mitsubishi-Green-Blinking-Light-Fix.pdf http://www.fixya.com/howto/h159332-mitsubishi_dm_board_repair http://hdtvoice.com/voice/showthread.php?t=32186 replace DM Picture of bad caps http://www.auctioncreations.com/wd62525a.JPG
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.