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Sounds to me like a thermal problem. Could be the power supply overheating due to a faulty power supply or the unit pulling excessive current and causing the protection in the power supply to set. It could also be as simple as a bad solder joint or 'out of spec' voltages. These problems are unfortunately difficult to find as when the set is working, it's working fine. Running the set and poking around with a chop stick or similar can sometimes help as does a heat gun. Look for expanded electrolytic capacitors, especially around heat sinks. These procedures can sometimes at least point you to the right region for further investigation. Good luck. Cheers Bob
possibly a dry soldered joint, when the television gets warm the contact is broken as the soldered joint has become loose. it is an easy cure if you can discover the fault, basically resoldering the joint. but can be difficault to find. i have normally done this using a freeze spray(must be designed for electrical applications). spray the circuit board insmall areas. when the relevent part is rapidly cooled the contact will again be mmade and the television will work until the joint heats up again once it goes again spray again to check. switch off and re-solder
It's easy to
locate, but requires adjustments once it is installed. Panel voltages
must be adjusted according the the specifications of the TV. There is
a sticker on the back of the plasma panel which provides each voltage
setting. You can reference this sticker to make the proper
adjustment. Using a DMM, connected between chassis ground and the
panel voltage you are adjusting, turn the adjustments on the power
supply very slowly, until you are measuring the specified voltage
within 0.5v. I hope this helps and good luck.
first of all let me ask how old is the battery, if it`s new-discharge the battery until pc shuts down itself because of low battery, remove the battery , unplug AC charger from laptop, wait for 5 minutes, then hold power button for 5 full seconds, wait another 5 minutes, then put battery and ac charger on , don`t turn on laptop yet, wait until battery indicator shows that battery fully charged, then remove AC charger, and turn on laptop.
P.S. you can try this on old battery too, but usually worthless, because old batteries are not recognizable by system currectly ..
It could be the transformer. The problem with protection circuit shut downs is you don't know which section is causing the trouble. The protection system is really just a current sampler that when it detects an excessive current it opens up the power relay and shuts the power off. And, as you indicated, unplugging for a few minutes will reset the protection detector.
But, there are about 8 or 10 sections within the tv and you don't know which section has the excessive current. Most common causes are power supply, high voltage supply, deflection amplifiers or audio amplifier. It usually takes a tech a few minutes to take some voltages and other checks to zero in on the culprit. Once the section is known then that tech can troubleshoot it for the bad component or shorted condition.
Usually it works fine until there is a signal coming in through the coaxial port. that is wen the tv gets switched off. Its a possibilty. Checking the power supply unit of ur tv and see if it has malfunctioned and check your power cable for starters.. Plz rate this solution.. thank you..
Sounds like the lamp to me. The projection lamps get hotter as
they age and the TVs have a sensor to monitor the temp and shutdown the
TV if it get too high
Projection TV makers charge an arm and a leg for their replacement
lamps. They make it easy to do but as a result the custom lamp
assy is expensive. The trick is to buy just the bulb for your
model TV from any number of us aftermarket sources at a fraction of the
lamp price and install it in the old lamp yourself. Really