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After I turn the DVD on, it will play (you can hear it) but no picture shows on the TV screen. I do not have a manual so I cannot check this out as to operation.

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  • idahomtnlady Aug 26, 2010

    The TV is Toshiba, an older one about 8 years old. The DVD is a CH DVD 320. I looked on the back of the DVD & there is no where to choose a channel.

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I need a bit more information to provide a solution. Is this a TV with integrated DVD or two separate units? If a stand-alone DVD, how are the two units connected. If you use separate video and audio cables (component, composite video or S-video), try new cables.

If HDMI or other cables do not help, then do you see the picture if you change the source? (Alternative sources will depend on the TV.)

If there is no picture, then look closely at the screen to try and determine the problem. If the backlight has failed, you'll usually see a very dim image if you look at the TV from an inch from the screen. Block the room light from overwhelming this image (sometimes a carefully positioned flashlight will help you see something). If the inverter or video board is bad, you will see nothing.

To diagnose a bad inverter or other board: For an out-of-warranty TV, open up the back of the TV and remove the shielding. Look for any scorch marks or bulging or damaged capacitors. (Sometimes other parts will fail on this part but these can be spotted easily. Capacitors look like cylinders on a tripod.)

If you borrow (or have a) high-end multimeter (able to measure high frequencies - 50 kHz) or an oscilloscope, hold the multimeter probes a fraction of an inch apart about an inch above the inverter board and power up the TV. If you see a 1 or an actual value, you have a good inverter. If you see a reading near 0, the board is bad or the multimeter can't resolve the frequency.

In either case, you can buy a replacement inverter for $50-150 and just do a simple swap. Disconnect all of the wires (connections are similar to molex and ribbon cables in a computer) and remove board (a few screws usually). Connect the cables to the new inverter. (If you google backlight inverter replacement, you'll find videos and text descriptions.) Note the part number on the board, including the Rev number, and order the exact one (shopjimmy.com or lcdparts.net are good starting points). Universal inverters do exist but can result in reversed controls (up to lower the brightness). Replacing individual parts on the board is cheaper but more prone to not tracking down all of the bad parts.

If the backlight(s) are bad (the number depend on the size of the TV) you need to remove the screen from the bezel of the TV then unwrap the edges. The backlights are sandwiched on the perimeter of the TV (usually under some tape that holds the lamp, reflector and other parts together. You need to order by length and width and get ones for your TV size. Remove the tape, and separate the reflector (make a note of how things are put together) then you have to Dremel (or use another rotary tool) to remove the plastic to get the backlight out. (They are often molded into the frame.) Then put in the new backlight and reassemble everything. (http://www.lcdparts.net/howto/default.aspx) but for an overview: http://www.inventgeek.com/Projects/BacklightFix/overview.aspx .Then push the new backlights into place, reconnect the wires and close up the sandwich of tape and other parts around the screen. Then replace it in the bezel.

Another way to test the backlight is with a known good inverter. Similarly a known good backlight can test the inverter.

I hope this helps.

Cindy Wells

Posted on Aug 27, 2010

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Do you have your tv channel tuned to the same channel/input that your dvd player is hooked up to in the back? If you give me the make and model of the tv and the dvd player I would be glad to assist you further if necessary. Here is a good diagram for connecting the dvd player to your tv:
http://www.tomselectronics.net/hookup.html
Thank you,
Lee

Posted on Aug 26, 2010

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