Hello, Mitsubishi DLP Mod.# WD-73736 the problem appears after few minutes with the HDMI signal, the picture get freeze but the sound keep runing, with the av1 video or s-video cable the problem appears like 30 minutes after. what do you suggest to do?

There are some adjustments should be done after the DLP chip replacement. If you wish to get some details; visit the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/

Check the HDMI cable make sure it is fully seated or better yet get another one. You can get them on eBay for a few $'s

Yes

need to replace the dlp chip under 200.00

Something here to try, see my previous answer for similar problem that has helped several people:

http://www.fixya.com/support/t12296849-turns_off_shortly_after_turn?mt_f=viewFull162

If you check the HDMI connector there may be a poor contact otherwise it looks like an under warranty repair is called for from the dealer it was purchased from.
Hope it's the lead.

Replace Lamp Mats has them for $99.00
1-800-628-1118

The Ballast that ignites the Lamp could cause the Lamp to fail and/or cause a buzzing noise. That being said, the Color Wheel in the Optical Block assembly could also cause a similar symptom. If Mitsubishi would be willing to help with the Lamp cost, I would call a local Mitsubishi repair facility to install it and see if the noise is still there and find out exactly what is causing it. Mitsubishi Customer Service Phone number is 1800-332-2119.
I hope this helps,
Skyassoc

i'd take it back!  it's obviously defective.  TV's are supposed to last longer than 4 months!