Intermittent power on problem, monitor now completely dead
This monitor had an intermittent power on problem. I took it apart to see if there were obvious issues such as blown fuse, burnt or blown device, bad solder connections on power connectors, etc. Found nothing obvious but before reassembling I had plugged it in to check output voltage from the power supply; Got 12V and 5V output from output connector, however, the led on control panel lit up and viola, the monitor worked. It continued to work for about 3 weeks until I had to replace the surge protector it was plugged into. Once it was plugged in, it wouldn't turn on. If I unplug it then plug it in to the live outlet, the status led (green on, amber idle) flashes very faintly but it does nothing else. I'm pretty sure the PS is good. If it is, then what else could be causing it to not turn on.
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In my case I took the monitor apart and replaced the small plug on the Menu switch unit with soldered connections. This requires you to have a very small soldering iron, mine has 1mm tip. The problem seems to be caused by the connections in this plug, or the other end on the On/Off board making intermittent or poor connections. This is not a job for the faint hearted. Getting the monitor apart is answered elsewhere but the following is a brief summary. With the monitor facing you pull the top of the bottom bezel towards you with two hands. It will come away from the screen face,keep on pulling until you hear the fasteners clicking out. Work your way round the bezel from left up to right down finishing at the menu switches. Its now best to lay the monitor face down and lift the back off as the switches are held in the front bezel and you will break the wires if you just pull the front off. Photograph it so you know how to reassemble. Reassembly is reverse, lay monitor on face locate back correctly and push down round edges to click in.
You have to check the ESR in tha caps in power supply with esr meter.
If you dont have one just replace all capacitors in the power section(there are severals of them)This is the simptom of low esr in the capacitors.
Return the monitor in factory settings.
1) Wall / extension source
2) Cable issue
3) Worse Case - monitor internal socket
4) Really worst case - Power board of the monitor is faulty due to
a) loose connection
b) damaged components
Intermittent is because at that time the connection is OK from the source to the board (lucky) Not because it is working now and not after that. Something is indeed wrong. If not because of 1 or 2 get a pro to look at it
Your inverter is dying. It produces ~2k volts for the ccfl (cold cathode fluorescent lights) that surround your display. At a few milliamps. Probably bad or leaking capacitors on the inverter or power supply board. So it is either using too much power (bad ccfl) or a weakening power supply (higher likely). It could be cold solder connections becoming intermittent. Remove the base, remove the screws on the backside, and split the case CAREFULLY. Inspect the power supply and inverter for obvious failure or leaking capacitors. Replace same... If your lucky, it will work. tom
The power switch on an LCD monitor is only a power saver, it does not switch it off completely. There is no reason why you cannot use the mains switch to turn the monitor on and off - assuming that it was on in the first place!
Most LCD monitors have a 3 year warrantly - at least they do in the UK. Why not contact Dell and get them to replace it for you. You should do this before the 3 years are up.