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Ep 771 unit shutting down.

The lamp has not reached its end of life it's about halfway through. The unit powers on and the bulb is extremely bright. The unit will say warming up and then 30 second to 1 minute the lamp goes out and the unit stays on. There is no sound or flashing led lights. I'm wondering if this is a known problem or any way to fix the unit. I have tried using a replacement bulb and re seating the old bulb. For the love of god please help me!!!!

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Check all the filters for dust and fur. This sounds like an overheat problem, and the easiest way of preventing damage is to remove the heat source, so the projector turns the Lamp Off. Also clarify that the fans are turning when the unit is powered up.

Posted on Mar 05, 2009

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Have a Zenith DTT901 converter box. In cold weather when you go to power on the unit, it shuts down and you need to remove and play with the plug several times. This does not happen in warm weather. The...


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Stony LCD 2007 goes off and screen comes on saying it needs projection lamp. Is this something I can replace myself ?


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My television has no picture or sound it just has black background with a white horizontal line in the middle


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Feb 07, 2009 | Samsung Portable Televisions

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Concept flip down monitor # cm 1520


Yes there is a fuse inside the unit,just open your unit and locate the fuse.If you aready change the fuse still not working then the problem go deeper.First, locate the horizontal output transistor. This is found very close to, or next to, the horizontal output transformer (also known as the flyback). The flyback should be on an aluminum heat sink, or on the side of the metal chassis. Disconnect or unsolder two of the three legs of the transistor. Measure it with your meter, or plug in the set with the light bulb attached across the fuse.
If the transistor is shorted, or the light bulb doesn’t glow bright anymore, replace the transistor and plug back in. If the light bulb glows bright again, you must replace both the flyback and horizontal output transistor simultaneously. In some cases this will fix the set, but sometimes there are multiple problems with a set.
Go to where the flyback is, and start measuring the diodes and capacitors on the flyback itself. If you don't find any shorts there, it could be a shorted vertical output IC, a shorted sound IC, a shorted disc capacitor in the Hi Voltage/sweep circuit, or in rare cases, a shorted capacitor or tuner. This TV monitor is small enough to take to a repair shop find a good one.You probably have to pay $50 - $75 dollars up..Feel free to ask and post whatever the result of your troubleshooting..


Hope this may help;

Regards,
VOTIT

DON'T FORGET TO RATE

Aug 12, 2008 | Portable Televisions

1 Answer

Dead set!


First, locate the horizontal output transistor. This is found very close to, or next to, the horizontal output transformer (also known as the flyback). The flyback should be on an aluminum heat sink, or on the side of the metal chassis. Disconnect or unsolder two of the three legs of the transistor. Measure it with your meter, or plug in the set with the light bulb attached across the fuse.
If the transistor is shorted, or the light bulb doesn’t glow bright anymore, replace the transistor and plug back in. If the light bulb glows bright again, you must replace both the flyback and horizontal output transistor simultaneously. In some cases this will fix the set, but sometimes there are multiple problems with a set.
Go to where the flyback is, and start measuring the diodes and capacitors on the flyback itself. If you don't find any shorts there, it could be a shorted vertical output IC, a shorted sound IC, a shorted disc capacitor in the Hi Voltage/sweep circuit, or in rare cases, a shorted capacitor or tuner.Feel free to ask and post whatever the result of your troubleshooting..


Hope this may help;

Regards,
VOTIT

DON'T FORGET TO RATE

Jul 30, 2008 | Portable Televisions

1 Answer

Magnavox 32


Very often this is caused by failing electroytic capacitors in the power supply and scan circuits. An experienced tech can troubleshoot for these parts and replace them. Most of the cost will be for the labour.

Jerry G.

Apr 12, 2008 | Portable Televisions

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