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Magnavox (Philips) TV model 27MS3404/17 ch L01.1U AC-7638 won't stay "on"

Hi,

I have a Magnavox (Philips) TV model 27MS3404/17 ch L01.1U AC-7638 (mfg 08/04) in my shop. The TV will turn on with picture and sound, but anywhere from a few seconds to a couple minutes, the horizontal sweep shuts down, which looks like the TV turned off, but the SMPS is running "Full" and the TV on light (front panel) is lit. Note: I replaced C2455

47/25 in the horizontal driver circuit, but that didn't fix this problem.

HV measures 27KV (aok). Note: I "fixed" a problem like this on a similar model several months ago by reducing the "Picture" (contrast) and Brightness that was set too high, but doing the same on this TV did not "fix" the problem.

Did anyone fix a similar model with the same symptom?

Thanks in advance, Brad

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Reply to
Brad
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could be any number of things. measure the b+. see if theres any variation from cold -warm-hot. may indicate bad caps. you may have a bad line output transformer, i have seen this happen if the transformer is bad; check for any minor arcing in a darkened room. the CRT going duff may also cause this shutdown.

and of course there is good ol' bad solder joints!

-B,

Reply to
b

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