I have a Proview LCD TV model # PA-32JK1A. When I plug in the TV, the orange standby light comes on like usual. When I turn on the TV (with the remote or the front panel) the blue power light will come on but all I see are a few (6 or 7) thin bluish white vertical lines on the dark (but properly backlit) screen. The backlights are obviously on but there is no video or audio signal. There is some slight white noise coming out of the speakers but it is not a real audio signal since it is not at all affected by the volume control or inputs. I have tried all of the various inputs (dvd, vga, audio in etc.) but there is no change in the screen or the audio from the speakers. I have tried to switch the input mode or bring up the menu with the remote and with the front panel buttons with absolutely no effect. The only buttons on the remote or the front panel that do anything are the power buttons. I opened the back panel to inspect the circuit boards and found no obvious burn marks or bulging/leaking capacitors. I tested all the pico fuses I could find on all of the different circuit boards and they all tested OK. I checked the power supply output voltages with a voltmeter and found 5, 12, and 24 volts on the various lines where it looked like it should have voltage, but without a schematic I couldnt be sure if each was correct. I suspect it might be the TCON board from some of the stuff I've read but I am not an expert. When I unplug the main input connector to the TCON board the thin white lines disappear but there is still no video or audio signal and the backlights stay on. When I unplug the left output ribbon from the TCON board (to the left side of the LCD Screen), the white lines disappear from that side of the screen only but remain on the opposite and the backlights all stay on. Same sorta thing happens when I unplug only the right TCON output ribbon. Apparently I can get a new TCON board for about $100 including the shipping but I would like a second opinion before I start ordering and swapping new parts. Thank you. Joe.

Thanks a bunch for the reply Budmrtn, I was beginning to lose hope anyone would be able to help with this stumper at all.

I disconnected the inverter board and the tcon board cables like you said and then tried all the audio inputs again with no difference from before. No audio signal coming from the speakers or from a set of headphones that I tried plugging into the output jack.

I tested all the wires going to the tcon board (at both ends) and the most Igot was 5 volts DC. There were some 3 volt signals and some 1 volt signals as well but I could not find any 12VDC anywhere going to the TCON board.

I do have what appears to be a good 12V DC coming out of the power supply going to the main board though. So if you are certain that there is supposed to be 12VDC going to the Tcon board then it's getting blocked somewhere on the main board.

I will try to follow the 12VDC signal through the main board and see if I can spot any obvious problems.

I'd still appreciate any further ideas or suggestions you might have.

Thanks.

Joe. Thanks a bunch for the reply Budmrtn, I was beginning to lose hope anyone would be able to help with this stumper at all. I disconnected the inverter board and the tcon board cables like you said and then tried all the audio inputs again with no difference from before. No audio signal coming from the speakers or from a set of headphones that I tried plugging into the output jack. I tested all the wires going to the tcon board (at both ends) and the most Igot was 5 volts DC. There were some 3 volt signals and some 1 volt signals as well but I could not find any 12VDC anywhere going to the TCON board. I do have what appears to be a good 12V DC coming out of the power supply going to the main board though. So if you are certain that there is supposed to be 12VDC going to the Tcon board then it's getting blocked somewhere on the main board. I will try to follow the 12VDC signal through the main board and see if I can spot any obvious problems. I'd still appreciate any further ideas or suggestions you might have. Thanks. Joe.

It's also possible that the speakers are somehow turned off in the menu but since I can't access or even see the menu I have no way of knowing.
Joe. It's also possible that the speakers are somehow turned off in the menu but since I can't access or even see the menu I have no way of knowing. Joe.

The 12vdc from the power supply module is used for the audio amplifirers for the speakers.
The T-CON uses SWITCHED 12VDC to power the T-CON board.
Did you find the surface mounted fuse on the T-CON board? The 12vdc from the power supply module is used for the audio amplifirers for the speakers. The T-CON uses SWITCHED 12VDC to power the T-CON board. Did you find the surface mounted fuse on the T-CON board?

Can you post the pictures of the T-CON board? So I can see if it has more than one fuse on it. Can you post the pictures of the T-CON board? So I can see if it has more than one fuse on it.

Like I said multiple times before (sorry, hehe) I found only 1 surface mount fuse on the TCon board and I measured 5 VDC on either side of it when the tv was powered up and on. I'm assuming that means it's good. Still stumped. Any more suggestions / help very welcome. Like I said multiple times before (sorry, hehe) I found only 1 surface mount fuse on the TCon board and I measured 5 VDC on either side of it when the tv was powered up and on. I'm assuming that means it's good. Still stumped. Any more suggestions / help very welcome.

Only 5vdc for 32" LCD PANEL does not sound right, I may be worng since most of the 26" and up LCD panels use 12vdc to power the T-CON board, but without diagram I cannot be sure. This will be tough to troubleshoot without diagram, I hate throwing in board until it works cause it can get real expensive. Keep me inform if you are able to get it to work, thanks. Only 5vdc for 32" LCD PANEL does not sound right, I may be worng since most of the 26" and up LCD panels use 12vdc to power the T-CON board, but without diagram I cannot be sure. This will be tough to troubleshoot without diagram, I hate throwing in board until it works cause it can get real expensive. Keep me inform if you are able to get it to work, thanks.

Luckily I found a donor tv set with smashed lcd panel for next to nothng. Swapped out the Tcon board from that one and everything works fine in mine now. Thanks for all your help. Luckily I found a donor tv set with smashed lcd panel for next to nothng. Swapped out the Tcon board from that one and everything works fine in mine now. Thanks for all your help.