I fix my problem of E:91:01 after that again appears

SOURCE: problems turning my tv on, need to try several times

I just recently had the same problem and finally my set would no longer turn on. I replaced the projector lamp and now my set works. However, when it first comes on, it only stays on for about 2 minutes and then goes off. After another minute, it comes back on and works fine from then on. I don't believe this double power up can be any good for the lamp, but I don't know if the problem is the lamp or the set. These lamps run on about 65 volts, but require a short blast from 5000 volt source to fire up. At $200.00 a lamp, I don't want to go buy another!

SOURCE: dark screen

Please check your user manual. There is an save mode. Leaving the save mode will solve the problem. If you need more help please advice.

SOURCE: no sound or picture now

The set may have shorted the horizontal out put transistor since it kept coming on sometimes. This could be cause by the driver transformer arcing causing a "spike" in voltage going to you horizoltal out put transistor. Stargazer

SOURCE: TV Turns off and on

How long since the last time the bulb was replaced? It sounds like the bulb is overheating and triggering a safety shutdown.

It's probably in need of nothing more than a good cleaning (open it up, clean off the boards with a can of air) and *may* be time to replace the bulb.

SOURCE: Sony 57 inch WEGA Projection TV

Hi, this is a very common failure, you need to replace 2 IC chips on your power supply board, marked on the top of the IC`s is this number: MCZ3001D you can purchase them here if you are very proficient at soldering & un-soldering, and the board has to come out of the tv to do this, you might want to call a tv man for this one, but it will fix your set, happy holidays, BMW Rider