My Mitsubishi WD-73734 TV will intermittently just shut down- no picture, no sound, the set just turns off. When I check the TV for an "error code," I am able to identify error code # 38. What does error code # 38 mean? This problem is very erratic. The "shut-down" can happen three times in ten minutes or may happen once in a month. Thanks!

No TVs will behave that way due to a timer. TVs only will display a nag screen telling you to reset the timer. If your lamp is more than 2 years old, it is suspect of failure. Be sure you buy a lamp with an Osram brand or Philips brand bulb inside. Any compatible(knockoff)lamps will not perform as they should. Mitsubishi DLP TV Bulbs
These folks sell original Osram bulbs in their lamps and they have a 6 month warranty. I use them myself for repairs and really have had great experiences with them.

Sounds like a light engine problem.

Bad optical light engine, most expensive part in set

Take a flashlight and at a angled view see if you can see the picture, if you can the lights burned out in the back

On the TV not the remote, simultaniously press the menu and input button for at least 5 seconds. This should give an error code. If it blinks 3 times then a pause then blinks 2 times, the code would be 32. Get your error code and look in the service book at: http://www.audiolabga.com/pdf/V36-V37-V38_Service_Manual.pdf -

Try this repair site to get the error codes.

https://www.youtube.com/watch?v=INird71KKtA

Try going to this website http://gadgettopics.com/Mitsubishi-Projection-Tv/, they shows the price and the specification of the product. You could also try buying online through http://www.amazon.com/Mitsubishi-WD-73734-73-Inch-1080p-HDTV/dp/B000RYUWX4/ref=cm_cr_pr_product_top.

Sounds like you need a new lamp. Try re-seating the lamp first. If that does not work you might need a new lamp.

check your lamp door interlock switch.