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Re: won't power up
If still under warranty or if you have no electronic repair experience you should take the set back to the shop or to a repair person. Some of the solutions described below can be dangerous, TV's are very hazardous to service. Even when plugged out, TV's can store very high voltages.
There are many things in the set that can fail, and cause it to not start.
The set would have to be properly troubleshooted.
If you still want to have a go at it, here are a few suggestions:
check for bad connections near the mains input, and main switch
continuity - wear and tear on the switch (and/or its soldering) may
have taken their toll.
could be a cold solder.
bad capacitors in the power supply are
Most small tv's have small glass fuses (like the older cars)
if it won't power up that is usually the problem.
If all else fails pull the power cord for a week and then try.
Good luck, Take care
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tThe diagnostic circuits is shutting your TV down. In most cases the set will shut it down immediately. Apparently your set hasn't shut completely down yet. When you turn your TV on the diagnostic circuits send a low voltage, low frequency signal through all the circuits and depending on how they come back whether the sets powers up to full power. If a problem is detected it will shut down to protect the other circuits. It sounds like you might have some capacitors going bad on your power board. A capacitor that is going bad would let it come on for a few seconds then the diagnostic circuits would see the capacitor getting further out of tolerance and shut the set down. If you are a DYS type person you might want to lay it flat of it;s face and remove the back. A bad capacitor will be bulged out on the top. are Replace capacitors with the exact uf value and if you can go above the rated voltage but never below., If this isn't the problem then it is probably the main board (the board where your cable hooks up to), There are other things that cab causes for this but I would check the capacitors first.
Col. Dana Gillespie
If it EVER works, then the problem is not a failed part, but a weak part. The most likely component type to give you such problems are capacitors. But very few repair techs know how to find such problems, and even fewer have the equipment needed to find the bad one(s) in-circuit. The failure mode is high ESR (ESR means Equivalent Series Resistance). The lower the ESR, the better. Capacitors with high ESR cannot stabilize circuits which demand high pulse currents, such as in switch mode power supplies.
Hold down the power button for 10 seconds. That will hard-shut the PC. Once that is done, fire it back up, and try again. Somethimes, windows will act goofy shutting down. Especially Vista when it is left on too long without shutting it down.
Hold the power button in for a few seconds it will shut down. Then unplug system and push the power button down with it unplugged then replug it in and power up again. Then do a proper shut down again to see if the problem fixed. I hope this assisted you. John
DLP Projection tv, Models WD-57731, The tv powers on but the screen remains black, the audio comes on but after approximately 30-40 seconds,the audio starts to skip and then the entire tv system shuts down. I reset it a few times but that doesn't change the problem
Solder, solder, solder! Shut down circuits protect crts to avoid permanent damage. If any of the deflection circuits are defective, or intermittent, shut down occurs. I have not only seen bad solder on deflection circuits, especially vertical, but also intermittent connections on the yokes themselves. I've also seen shorted convergence ics cause shut down. Don't forget solder connections in the power supply.