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You either have a cold solder joint in your horizontal deflection circuits or your or in your horizontal output circuit. please be careful due to the fly-back transformer still holds power even unplugged until you discharge it.( ground it out). Hope this helps.
power board is bad if it doesnt power up -- the red flashing lights mean that you need to upgrade the software-- you can get a new software upgrade on the website for philips --- use a thumb drive to install it into the television
42mf237s/37 no enciende
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