Question about Proview PA-32JK1A 32 in. LCD Television
My proview rx 326 has sound but no picture just a black screen. I tried unplugging everything and plugging it back in and a few other things, how do i fix it please???
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.
Posted on Jun 22, 2009
You can check this article which addresses several different problems encountered with Proview RX-326 / 3200:
Hope it helps...if it does please do not forget to rate it :-)
Posted on Jun 08, 2011
If the sound is working, I doubt the power supply is at fault. You can check with a simple voltmeter - red is positive, black negative - there should be 24VDC. There is an on-board regulator to drop the voltage for the CPU, etc, . THere is a green LED on the main board, so even if you don't have a Voltmeter, there is a visual indication that the power supply is somewhat functional.
I found a poor connection from the 24V power supply over to the inverter boards. I re-crimped the IDC connectors to the 24V supply and all was happy-town.
Posted on Jun 05, 2008
To clarify where the inverter board is exactly:
When you open the TV there are two basic parts inside. the back part has the power source, inputs etc. The front LCD part is where the inverter board is.
There are four screws that hold the LCD portion in (this is after you have taken the front plastic shell off). after unscrewing the four screws, there are 3 or so plugs that join the two halves electronically. Undo them and make sure to place some marker so you know exactly where they go, (i used electrical tape to indicate the top plug). CAREFULLY lay the LCD screen side down. On one side there is a board with a black plastic sheath covering it. That is your inverter board. There are six or so screws and a bunch of plugs. after unscrewing/unplugging the board pull the black plastic off from the back. There is no need to cut it as it un-sticks, which makes putting it back on easy. when you have isolated the inverter board check out sdsupnet's pic located on this page. By looking at his pic you can easily identify the open fuse on your inverter board. Feel free to bypass it just to see if you can get the TV working, but i would recommend putting a fuse in there perminently.
Generally, it is a bad idea to bypass fuses for extended periods of time, as they are there to protect more expensive components. I have found a 1 amp 125 volt fuse that should at least help protect the board. here is the link.
The fuse here has a time-delay feature. The unique time delay feature of this fuse design helps solve the problem of nuisance “opening” by accommodating inrush currents that normally cause a fast-acting fuse to open. IMO this is a good thing, if you don't think so, find your own fuse :P.
hope this helps
Posted on Sep 30, 2009
I had the exact same problem. I found a black tiny surface mount fuse that had the marking 20 on top was bad. The rating is 1amp at 76V. It is right next to the bottom connector and is marked as F1. Luckily I had one rated at 1amp and 125V. Works great now.
Posted on Aug 25, 2008
Where do you get the power supply board
Posted on Nov 05, 2008
I had a similar problem of sound but no picture. After 45 minute wait for tech support found out it would cost $495 for parts and $300 for labor to fix. No support for this brand x. 3 year total loss.
Posted on Sep 04, 2008
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