Tip & How-To about Televison & Video

How to replace a circuit board in modern TVs.

If you can use a screwdriver and have good observation skills you can probably change any board in modern TVs. With the kind of technology we have today the average person cannot repair a board and shops cannot either. The costs for replacement boards are low enough to warrant replacing the board.

There are many places to get the board or boards you need such as http://www.encompass.com or http://www.shopjimmy.com or http://www.tristatemodule.com . First you have to determine which board it is that you need. This can be difficult for even the most seasoned electronic technician.

For example, generally in flat screen TVs the most likely problem, when they will not turn on, is the main board or power supply board. Determining which of the two is the problem is where the experience comes in to play.
If you do not mind paying a restocking fee, and perhaps the shipping on the part, you could order boards until the cows come home and send back the ones you do not need. Generally if you are not a repair shop the restocking fee is 20%.

There are many variables and I would recommend asking the experts on this site to help with the diagnosis of the problem. My tip is only to explain how to remove and replace the board properly.

Once you have diagnosed which board needs replaced you need to order it. Most electronics today are static sensitive and you should not touch the board without being properly grounded. You can purchase the proper equipment at http://www.mcmelectronics.com under electrostatic protection. It should include a mat, a wrist band and the associated interconnecting wires.

Once you have the proper work station you can open up the set by removing all the screws around the perimeter of the back and taking the back cover off.

Locate the board you are changing and remove all the wires and connectors marking them if necessary for proper reinstallation. The most simple way to do this is to use a sharpie and put a unique number on each connector, both the male and female end.

Remove the screws holding the board in and reinstall the new board.

If this was the problem and you replaced the board succesfully you should now have a working set.

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Parts are from the manufacture only unless you can find a used board from a scrap set. A used board may have a lower reliability than a new one, and there will be no warranty. After changing the board, there will probably be some calibration required to match the new board.

Almost all the repairs on modern TV's are done with board swapping. This is because of the complexity of the design of the circuitry, and the way that they are assembled. These boards are using multi layer assembly, with embeded component technology with very high density surface mount technology. To troubleshoot these boards and then change parts would require very extensive instrumentation and tools that would not be feasible for any service centre.

I suggest you give the set only to an authorised service rep to have it serviced properly.

As for the DLP sets, from the statistics that I have been seeing, they are general lower in reliablity than the Plasma or LCD sets.

The DLP sets also do not produce as nice a picture because they are using projection technology rather than direct view technology. If you go in to any of the TV stores and compare them to the Plasma or LCD sets you can see the difference right away.

Jerry G.

May 06, 2008 | Samsung DLP HL-P5663W 56" TV

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