No picture but there is sound

Check the speaker/s first. If found OK; check and replace the damaged component/s at its audio output section circuit board. If needy, replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. Surf the site with patience.
http://electronicshelponline.blogspot.com/

The power supply board is the problem. You can get parts from here:
TV Parts Universal TV Stands DLP Chips ShopJimmy

There is some incompatibility issue. Did you check the format is set correctly for PAL/SECAM etc.?

http://blog.coppelltvrepair.com/2011/06/proview-3200-rx-326-does-not-power-on.html

Hope this helps!

that problem is on the back-light lamp of your LCD TV it is busted or weak need to replace it

Yes,it have a Digital Tuner inside.It can get free air signal tv.No,need for a converter box like a Analog CRT tvs.

The RX-326 does not have a digital tuner, only an analog.

If it happens at a certain time every day, make sure you do not have the sleep and wake timers on.

I just fixed my proview 3200 that doesn't have picture but with sound.
First, thanks for the tips I got from this forum. I checked the 24v from the power supply board and that's perfectly working fine. I then check the fuses in the Inverter board. There are 4 white fuses (2amp I guess, i cant remember) and 1 black fuse (1amp/76v just behind the wire connector going to the power supply board). The black fuse is the one that blown out on my tv. This fuse supplies power to the LM358A IC. I know its not right but I just solder a thin piece of wire to short circuit this fuse. I'm lazy to drive to RadioShack to find this fuse. :)
....and that worked beautifully. Check the picture attached for what I did.

I have same problem, im goin to try this fix i found on youtube.. different tv but same problem

http://www.youtube.com/watch?v=_0175VbmV9M&feature=channel