Question about Projection Televisions
I am a tv tech that is working on a mitsub dlp that is showing an error code of 44, ( dvi cable disconnected from light engine.). the cable pins are checking ok, and the solder connections on both the framer module & interface module in the main cluster to the left of the light engine check fine. am I looking at a bad framer module, or maybe a bad board in the main cluster? I have already changed the 1000ufs@ 16 in the DM, & also the 3300ufs in the power supply that feed 5v over to the ballast for startup, but I have never seen this type of problem before. any help would be appreciated.
There you will find the information that came with the TV.
Posted on Nov 23, 2008
Did you check the caps on the DM board? They usually go bad after a period of time. Remove the DM board and the metallic cover and there should be 4 to 7 capacitors (There are different revisions of the DM board). Check these caps also, replace if needed.
Posted on Apr 14, 2009
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,
Posted on Jan 07, 2010
Only one of two reasons for your problem--either the DM is bad OR:
These sets sometimes develop a problem with the front keyboard---micro switches in back of the plastic buttons can fail (reset one is common).
Remove front speaker grill and inspection plate behind it and follow the group of wires coming down from the front keyboard to the right top edge of the opening.
About 8 inches to the right you will find two plugs that are inline--they go to the keyboard--disconnect both and turn set on with REMOTE (remote receiver is behind the screen).
If the set now functions you have a bad micro switch on the keyboard (most likely the reset) and two choices---either leave the keyboard unplugged and just use the remote or remove entire screen and get at the circuit board and locate and replace defective micro switch.
Lots of people miss this as a possible choice--easy to do to either know it is the keyboard or not.
If set does not operate this way DM is bad regardless of how caps look.
Posted on Feb 08, 2010
Testimonial: "Thanks. I had found and tried the front control panel solution prior to your response but to no avail. Thanks for the help. Take care."
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