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More than likelly the Switch Mode Power Supply board is not powering up. Often caused by bad or leaky electrolytic capacitors.
Nowadays, the switchmode power supply module converts the incoming AC power to the lower DC voltages required by the other circuit boards.
It uses lots of Electrolytic Capacitors to clean up noise in the DC power. But one Electro Cap is used to store a charge for turning on the switch mode power supply. Being Electrolytic they are prone to leaking & bulging so they don't do their job. They won't hold a charge. By pulling the plug and restarting, you have found a way to overcome the problem. But only temporarily. When the Cap goes fully bad, you won't be able to start the TV any more. Suggest you order a switch mode power module for it or take it to a tech who will replace the module. It's usually in a metal shielded small box full of ventilation holes.
I have repaired many switch mode PS but most tech's these days don't bother. They just get a replacement board
If you have the technical ability you could find the faulty part, unsolder it and replace with a new one for $1.50
If your Dell switch mode power supply is faulty then I suggest you replace it with a new one that is the same wattage or higher wattage. Fixing
faulty ATX power supplies is not a DIY project, there are dangerous
voltages in these power supplies and can cause death or serious
repairing a power supply do not need a diagram often faulty on a power supply are the regulator transistor,capacitors,resistors,and diodes. just check these parts and you can fix the power supply.check also for loose contacts and connectors this also cause a fault on the power supply.
Usually in these units, it is either the Power Supply is faulty, or, Check the Mode Switch, these are common causes of NO GO. One MUST ALWAYS start at the PSU, as if the Voltages are NOT correct there nothing else can be.
Good day sir, your tv or any new tv are now using SMPS or technically called switch mode power supply, a regulator mode that is more efficient than traditional power supply, the down side is that its prone to defects, there are three main parts the Switching element which is the transistor, the oscillator circuit which is usually an IC that controls the frequency of oscillation and the high freqency power transformer that works with the switching transistor. All of these parts are need to be checked to ensure proper operations. SMPS also detects overload, which is caused by faulty parts on your tv, unless that faulty part is not found, it will not start and go on standby mode, worst will always shuts down. Call your dealer on how to go about your tv problem or have it check by a qualified technician.
This happens when the CPU overheats and shuts down (ie thermal overload) and won't boot up again until it has cooled down. If the problem is not rectified, eventually the CPU will fail.
The problem is caused by a faulty CPU fan and or the fan and heat sink assembly is clogged with dust. The switch mode power supply fan may also be faulty or clogged with dust.
Check the CPU fan, if it does not spin freely then replace it. Also loosen and vacuum the dust off the heat sink.
Check the switch mode power supply fan, if it is faulty replace the fan or better still replace the power supply.
Power supply (switched mode) is shutting down due to either a fault within the power supply itself, or a problem in the line stage (EHT) and the current protection circuit is shutting down to prevent further damage. Flyback diode often fails shutting the power supply down.
A circuit diagram is required in order to repair this.
Most likely you have a bad power supply, or a short or overload that causes the power supply to shut down. You will need a DVM (digital volt-ohm-meter). Using the DVM and the instructions on the PS, unplug all PCI boards and all wires on the HD's. There should be a point where the PS will not shut down. Then you will have to install all the connections one by one, until the PS shuts down. You will have to turn off the computer for each of the connects and each of the re-connects or you are exposing your computer to a great danger. CONSTANTIN (arzconst)