These are some instructions that came from Eric Johnson on another newsgroup. The steps that he suggests are to be done with the OEM remote from Mitsubishi:

"There are discrete codes posted in the Pronto files section of this website that work on many Mitsubishi sets.

Here are some workarounds for others:

Old Mits TV’s:
Go to User Setup Menus and enable Mitsubishi Active AV Network. This enables VCR “A” Play command to act as ON and EXT 1 command

New Mits TV’s:
Press and hold the power command and enter 090. Now, power=on, stop=off, two step macros for all inputs:input, PIP=DTV;input, 1=EXT1; likewise inputs 2,3,4; input, 5=DVD component 1; input, 6=component 2; input, SQV=Input STB; input, QV=Input VGA; input, PIP CH UP = Ant A; input, PIP CH DN =ANT B

Eric Johnson
www.hometheaterpro.com "

-Jon