Question about Philips 42PF7421D 32 in. LCD HDTV
The most common cause of this is a defective button assembly on the front of the set. With the set unplugged, try pushing each of the small buttons on the front panel. You should be able to feel them engage. They should all feel the same. If one does not feel like it is engaging, it is possible that it is defective. If the set is no longer under warranty, you can attempt the repair. Be forwarned that the panel is extremely fragile and can easily be broken. Carefully place the set face down on a table that has been covered with a pad of some sort and remove the back cover. You should be able to see how to remove the front panel board assembly. I'll try to get the part number and post it here.
Some times a little dirt gets into these tact switches and can cause odd behavior. Try pushing each one a few times while unplugged and see if that clears it. If not, replace the switch panel. It is possible that a low 5V supply can cause this as well, but usually other symptoms show up too.
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Posted on Jul 17, 2009
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Posted on Jan 02, 2017
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