Question about Samsung LN-T4042H 40 in. LCD HDTV

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The picture on our Samsung LN-T4042T is flickering like crazy. Could it be the color wheel? How much would it cost to replace (when a technician does it)? Or can we do it ourselves?

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Your TV is an LCD flat panel TV, it does not use color wheel like the DLP TV.
You may have problem with either the power supply or the backlight inverter board, you need to check them out.
If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on:

Please see my basic troubleshooting guide here:
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Posted on Jul 11, 2010

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Posted on Jan 02, 2017

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My TV has a severe flicker/jitter in the bottom left quadrant of the screen. How do I fix it?


The main power supply regulator section circuit fault. Either it will be a separate board, or the part of main board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/
It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.

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thanks doctor video leadingedgeeletronics since 1987

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