Hi All. Sorry if this is a little long, but I've done a bit of troubleshooting already and would like to list the results I've encountered so far.
I have a Samsung LN40A630 LCD TV that just started having an issue the other day. When I turn on the TV, I get various colored, vertical lines moving about the screen, as well as some static looking horizontal lines/waves that also randomly run through the screen.
Eventually, if left on for a couple of minutes or so, the lines will fade away to a blank screen with the backlight noticeably still on. If I leave the TV alone and let it sit on, the lines and static will come back and the process happens anew.
There is no picture visible on the screen when this happens or at any time really; I plugged my laptop into the set via both HDMI and VGA, as well as a chromecast in a different HDMI port. I also turned on the TV with no video source connected at all and there is no difference.
I have turned on/off the TV multiple times and also left it unplugged from AC power overnight; the issues persists.
I'm not quite experienced enough to determine the exact cause of the problem, so I'm hoping the great community here can help me narrow some things down. I'm guessing it could be a bad power supply board or mainboard. I'm not sure if it's the T-CON board as I believe the lines on the screen are typically static when the T-CON goes bad, but I'm not ruling it out.
I have looked at the caps on the power supply board and none of them look bulged or leaking, but I know that doesn't necessarily rule out a bad cap.
I've attached several images of the screen during various phases of the lines/static motion. Also I attached a pic of the power supply board in case someone can see something I missed.
I really appreciate any help that can be offered. Luckily this isn't my primary TV, only a rarely used bedroom set, but I'd still like to avoid having to buy a whole new set if I can.
I have a Samsung LN40A630 LCD TV that just started having an issue the other day. When I turn on the TV, I get various colored, vertical lines moving about the screen, as well as some static looking horizontal lines/waves that also randomly run through the screen.
Eventually, if left on for a couple of minutes or so, the lines will fade away to a blank screen with the backlight noticeably still on. If I leave the TV alone and let it sit on, the lines and static will come back and the process happens anew.
There is no picture visible on the screen when this happens or at any time really; I plugged my laptop into the set via both HDMI and VGA, as well as a chromecast in a different HDMI port. I also turned on the TV with no video source connected at all and there is no difference.
I have turned on/off the TV multiple times and also left it unplugged from AC power overnight; the issues persists.
I'm not quite experienced enough to determine the exact cause of the problem, so I'm hoping the great community here can help me narrow some things down. I'm guessing it could be a bad power supply board or mainboard. I'm not sure if it's the T-CON board as I believe the lines on the screen are typically static when the T-CON goes bad, but I'm not ruling it out.
I have looked at the caps on the power supply board and none of them look bulged or leaking, but I know that doesn't necessarily rule out a bad cap.
I've attached several images of the screen during various phases of the lines/static motion. Also I attached a pic of the power supply board in case someone can see something I missed.
I really appreciate any help that can be offered. Luckily this isn't my primary TV, only a rarely used bedroom set, but I'd still like to avoid having to buy a whole new set if I can.
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