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We own a Sony Bravia 40 inch LCD TV which we fully enjoy, but as of the other day we have now picture just sound. We have checked all of the obvious things so we were wondering is you have any suggestions for us.

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This problem is a widespread one with LCD T.Vs . 6 screws that attach the inverter board to the LCD gray metal bottom loosen over time, causing the TV to periodically lose video while retaining audio. (Sometimes turning the TV off and on restores video, sometimes not). The problem gradually gets worse making the TV unusable.

The best solution for most TV owners is to contact Customer Service to send someone out to fix this problem free of charge and it might take some pressure and a number of calls to get this outcome.

If you decide to fix the TV yourself the good news is that there are no parts to buy and the fix is easy and quick, . The bad news is that disassembling/reassembling the TV is neither easy nor quick. The following instructions, however, should help make your disassembly/reassembly much easier.

My first advice is to obtain a copy of the Service Manual.The different steps of disassembly are:

1) Stand Assembly
2) Back Cabinet Assembly
3) Angle Back Assembly
4) LCD Cover Assembly
5) LCD Bottom with Inverter Board

Disassembly Instructions

Lay the TV face down on a table covered with soft material.

1) Stand Disassembly

Remove the 4 screws holding the stand on with a hex driver. Remove the stand.

2) Back Cabinet Disassembly

Using a screwdriver (preferably magnetized), remove the 16(?) screws around the edge of the back cover molded into the cover. Remove and keep separate the two screws in the center of the back cover (a different size). Remove and keep separate the screw holding the on/off button unit (different size). Lift off and remove the back cover.

3) Angle Back Disassembly

Next you need to remove angle backs 1 and 2. The angle backs are the metal parts that support the stand and run down the middle of the TV. Each is labeled with a stamp in its metal. Remove both angle backs.

4) LCD Cover Disassembly

This is the most challenging disassembly step. Loosen but don't remove the four screws that hold in the side spring clips. Remove the eight silver-topped screws that hold the cover down. Remove the 2 screws holding down the on/off button unit and remove the unit itself. This exposes a screw coming in from the side. Remove it and the 3 other screws coming from the side, 2 on top and 2 on the bottom.

The LCD cover should now be free, but it cannot be removed without undoing some connections. Remove or cut the tape on the top side middle that seals the cover to the LCD. The wires to the bottom left speaker must be disconnected. Pull out the plug connecter. Slide off the red and blue wires by depressing the little metal tab that locks them in. There are two ribbon connections in the middle of the LCD cover that also must be disconnected and pushed down through the metal in the cover. One requires that you cut the cable tie that connects it to a black plastic ring. Pull it off gently and slide it down. The other is very thin but also pulls off. Now the cover can be lifted off and moved about 8 inches to the right.

5) LCD Bottom with Inverter Board

Once the LCD cover is removed, on the left side you can see the metal cover of the inverter board and the six screws holding it down, the very screws that we have been looking for! Remove the six screws and the metal cover. Without disconnecting any of its connections, rotate the inverter board up and to the left to expose the bottom of the inverter board as well as the gray metal bottom of the LCD to which the inverter board is attached and grounded. Note the 3 copper rectangles on the bottom of the inverter board surrounding the 3 screw holes away from the left edge towards the middle of the TV. These are the grounding strips that lose their connection.

Using contact cleaner clean off any black burn marks from these connectors. Also clean all black marks from the metal bottom that they contact. Clean carefully and thoroughly. You might need to scrape lightly to remove all marks.

Rotate the inverter board back in place. Line up the metal inverter board cover. You can either use the 6 existing screws or purchase replacement screws. Using a removable thread locker coat the screw threads of one screw. Tightly screw in the middle edge screw first. Follow this by the edge top and bottom screws, then the middle inner screw, and finally the top and bottom inner screws, using the threadlocker on all 6 screws. Verify that all screws are tight.

6) Reassembly

Reassembly is the reverse of disassembly with the advantage that you have been there once before. As long as you have kept all your parts separated and follow the exploded view diagrams of your manual, it should be easier and quicker than the disassembly. Remember to reconnect all the connections that you disconnected.Be sure that all screws return to their proper places.

Now you will discover that the problem is fixed. Enjoy watching the T.V.

Best Regards. Thank You.

Posted on Aug 27, 2010


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