Mitsubishi officially stopped producing rear-projection televisions -- typically large sets that rely on a lamp-powered mini projector to produce a big-screen picture -- in 2012, despite technological advances that offered improved light output, increased picture resolution and more. Because Mitsubishi's lineup of rear-projection TVs spanned decades, troubleshooting methods vary per specific model -- as such, your owner's manual serves as the best source for troubleshooting info. However, some tips apply across various models.
Sometimes, simple internal hiccups require nothing more than restart, especially in the case of smart TVs. Reset your Mitsubishi projection TV if it does not turn on or off or if it fails to respond to the remote or on-panel buttons. Hold the unit's built-in power button for 10 seconds until the TV turns off, then power the set on to reset the TV. Unplugging the unit for at least 60 seconds and then plugging it back in may also remedy these issues.
If your TV issues involve the appearance of your TV's picture, the remote may be your salvation. Press the "Format" key on your Mitsubishi rear-projection TV's remote control if the shape of the picture seems incorrect. Press the key repeatedly to cycle through various aspect ratios until the picture looks correct. To restore all audio and video settings to their defaults, enter the TV's main menu and select “Reset” from the Picture tab. From the same tab, you can reset colors to their defaults by canceling optional image features such as PerfectColor or PerfectTint.
Heat Fixes and Remote Remedies
If a message appears stating that the TV will shut down due to air flow blockage, decrease the temperature in the room and move any objects that may be near the TV's vents. As large televisions, Mitsubishi's rear-projection sets require at least four inches of clearance on all sides to avoid overheating. Replace your remote's batteries if the device's Power key blinks five times. Stand within 20 feet of the TV and slide the device's switch to the “TV” setting to correct erratic remote behavior. Press the "Enter" button on your TV's remote after you enter a channel number to speed up the channel-changing process.
Lighten Up With Lamps
Like other rear-projection models, Mitsubishi's TVs rely on a lamp to produce brightness; if the picture looks dim, you may need a replacement lamp. Late-model Mitsubishi projection TVs use cartridge-style lamps, which you can order from the manufacturer. To replace the lamp, power down the TV and allow the old lamp to cool, then unscrew the cover of the lamp compartment with a Phillips screwdriver. Pull the old cartridge straight out and insert the new cartridge in the same orientation, being careful not to touch any glass components, then replace the compartment cover.
Contacting the Pros
If basic troubleshooting procedures don't remedy your Mitsubishi rear-projection TV, contact the manufacturer's Customer Service Assistance and Service Referrals at 800-332-2119 or visit the company's official TV support website to download user manuals, read FAQs, watch video tutorials or get in touch with an authorized service center.