Question about Samsung HL-S4266W 42" HDTV

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Says check fan #2 on the screen when turned on and then after a few min the TV shuts down. would like to fix myself if possible. I do not have a service manual

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One of the fans most likely has failed, or there are some parts overheating on one of the boards in the area of fan #2, or there is a fan velocity sensor fault.
If you open the back of the set, you can turn it on and watch to see what fan is not spinning. If all the fans are spinning then it is a board fault. If you see one fan that is not spinning, you can probably try to order one from the manufacture. When you replace the fan, and if it still does not spin, then there is a fan servo driver fault on the board that drives the fans.
In many of these sets, the fans are uPC controlled via servo drive amplifier circuits. The fan velocity is temperature controlled, something like what is used in many of the PC computers. If this board is at fault, it is best to replace it.
As for replacing boards, this can become trial and error to find the failed board. The authorized service shop will try the boards one-by-one until they find the board that is causing the fault. They will then be able to leave the new board in the set.
Very little component level service is supported for these boards. They are very sophisticated and very involved to troubleshoot. The service reps will replace boards to fix faults.

Jerry G.

Posted on Nov 14, 2009

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