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The problem is inside of the tv. Your speakers are probably fine. The problem in most sets I have found is that the internal parts/Brackets are vibrating particularly at the lower frequencies. You must insert non conducting foam and duct tape to immobilize any moving parts. With the back of the set off, Tap the chassis with your finger and you will hear where the vibrations are coming from. Repeat taping and inserting the foam until the vibrations stop or are minimized to acceptable levels. You can also adjust the custom audio with the equalizer to cut the base frequencies. This is a common problem. In some cases I have found Bad speakers and need to be replaced and is really simple to do with the back panel removed. Once you see the speakers you will how simple it is to replaced the speakers.
Many Mitsubishi projection TVs have bad control panel switches. These switches fail and lock up the TV's computer, disabling everything. If you can unhook the control panel, the TV will work fine with the remote.
Remove the speaker grill. Pull on the sides, it should come loose with a little effort. Remove the access panel by removing the 4-6 screws using a philips screwdriver. Follow wires from control panel inside to the connector labeled "DZ". These will be the thinner wires, not the thick ones that go to the video jack. Unhook this connector and the TV should work with the remote.
You can replace the switches, but the Mitsubishi buttons sometimes will just fail again. Using another brand of switch may be more reliable. Better to just use the remote and let the buttons be useless. Nobody uses these usually anyways.
Some models will require you to unplug the TV for a minute, and then plug it back in and wait about 2 minutes before the TV will work again (reboot the microprocessor inside). The biggest issue with repairing your TV by unplugging the control panel like this, is that you no longer have the green LED on the front panel. Many Mitsubishi TVs will flash the green LED for about 90 seconds and then the TV is ready to turn on. Without this panel connected, you just have to remember that you need to wait 90 seconds after plugging in AC power before the TV will be functional.
If this fix does not help resolve your "dead" set issue, you likely have a bad power supply or bad signal board. The way to know is to check the +5 volt standby line inside. You can check this on the same connector to the front control panel for an easy check, without opening up the back. Just check all the pins and one of them should have the +5 volt standby sending power to the switches. Use the outside of the video jack as your cold ground. Thanks and good luck!
Front buttons . Remove the lower front speaker covers/panels by pulling . Then unplug connector ZF to the keypad . Then wait 3 minutes and try to turn it on with the remote . You may have to remove the access panel to find connector ZF (just follow the wiresdown from the front keypad). Don't touch , turn or break anything else while inside the access panel!
Let me know if that works
There are 2 possibilities: either you have a stuck front panel button, or the remote sensor is bad.
You can eliminate the button issue by removing the front speaker grill and access panel and disconnecting the button assy wiring harness.
There is a plug/socket connection there that you can easily disconnect. If after disconnecting the control panel, you still have no remote, its the sensor. Its located behind the screen assy mounted behind the CRTs. You will have to remove the screen assy to get to this.
If you're not up for this, a service company will charge you $300 or so to replace the sensor for you.
try removing the speakers from the cab and trying known good speakers. That way you will know if there's any power or not.Otherwise you will have to remove some of the panels on the dash to gain access to the reciever. After you can open upa space to access the reciever, it is only a matter of removing a feww screws and the nut at the back that holds the reciever stable.remove radio fuse before doing anything.