Power surges and modern electronics.

John Keiser · 2010-12-10T17:11:18+00:00

I am in Hawaii where power surges are unfortunately common. Having lost several PC power supplies, I now use line conditioning battery backup units to protect my PCs.Several months ago I salvaged a Westington flat screen [LTV-32w6 HD] that had been abandoned because the tuner failed. As the tuner is part of the motherboard I didn't fix it was easier to use an external VCR as the tuner. TV functions fine. I assume the tuner died in a power surge.Yesterday, the power failed and I awoke to find that the TV had turned itself on but no sound. Toggling mute and adding external speakers did not work. I assumed the worst but guessed that maybe this was a microprocessor locked into mute. I unplugged the set and tried again after 15 minutes. Sound was restored. Whew!I wonder how many consumers would be so lucky? Is this type of sensitivity common? [I have a nice old 32inch CRT that has been immmune from these problems and provides a great picture.] I'll probably add a line conditioner, but, really, are consumers expected to be that cautious?

Dec 10, 2010 40 Replies

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PlainBill47 15 years ago

You missed the basic reason. A 1976 Sanyo TV was an analog TV. The power supply was largely unregulated. The highest frequency encountered in the power supply circuits was the 15.625 Khz horizontal sweep.

The digital converter uses an SMPS power supply, and would have been considered a very sophisticated computer in 1976.

PlainBill

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Power surges and modern electronics.

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