Question about Computers & Internet
The monitor powers on but is black. when we disconnect the cord from the tower it shows an error message 'no signal' so it knows that it's disconnected. When we push the screen menu buttons nothing shows, it remains black.
Try monitor on a different working desktop to see if it works, both on the external and internal video card ports. If screen menu buttons fails to respond, fault is either on menu buttons or you may have a burned out lcd screen, try a different monitor on your desktop pc to check its functionality. Monitor probably needs replacement.( It might not be burned out for you mentioned "no signal" error message appeared on screen, have the screen menu buttons checked)
Posted on Dec 28, 2013
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Posted on Jan 02, 2017
I had exactly the same problem. The volume up button was constantly on, causing the on screen display to be permanently displayed. Here is the solution to fix it. This will also work for any other front panel buttons that are misbehaving.
Note: If you monitor is still under warrantee, don't try and fix it yourself - just send it back.
If you open your monitor you will find a small circuit board with a row of microswitches mounted on it. This is the circuit that's causing the problem.
To open your monitor you will need to remove the stand (one plastic cover that unclips by hand and 4 screws that can be removed with a philips screwdriver). This will then reveal two additional countersunk screws that need to be removed.
You can now remove the front cover. There are 4 clips at the base of the cover that can be removed by hand. You then need to pry the cover off, starting at the corner next to the power button. This is really quite stiff and you need to use a reasonable amount of force. Don't worry about the loud cracking sound as each clip along the side releases.
Once the cover is removed you will see the circuit board with the microswitches staring you in the face.
This board needs to be replaced but if you want to fix the problem immediately here is what I did.
Disclaimer - Proceed at your own risk from here on in.
Plug your monitor back into the power and reconnect to your PC. Make sure it's on and still showing the same problem.
The curcuit board unclips and there is a 7 pin connector that also can be unclipped. Remove the board and undo the connector. You don't need to switch off the power.
After the board has been removed for a few seconds, the on screen display that was permanently visible should disappear.
Now I temporarily disabled the malfunctioning button by bending the associated pin on the connector 90 degrees and then reattaching the connector.
How do you know which pin is associated with which button. Trial and error. Simply bend down a pin, and reattach the connector. If the problem persists, unplug and try the next pin.
When you've found the correct pin, straighten the others and reattach the connector.
Clip the curcuit board back in, making sure the connecting cable is clear and doesn't get pinched.
Reassemble your monitor and you're good to go.
The next step is to order a new circuit board from Philips. These should be really cheap (I hope) and you now know how to fit it yourself.
I'm going to try ordering one tomorrow.
Posted on Aug 04, 2008
My monitor does the same thing at times and sometimes shows "No Signal" and at other times the screen will maintain the images but the backgound color switches to mustard yellow. In each of these cases I have been able to solve the problem by unplugging the power cord from the electical outlet for about three seconds and plugging it back in. I have a KDS model 780 LCD.
Posted on Feb 16, 2009
The monitor is probably on protection.
To start unplug monitor from power and from computer and test computer with different monitor to find out if it is monitor or computer fault.
If it is computer fault and no video signal , then test:
If it is monitor fault , then the monitor is on protection.
When on protection you keep having a flashing led on front of the monitor , and monitor turning off by itself after a while, that indicates a fault condition.
The flashing light indicates a diagnostic state called protection.
When the Monitor goes on protection there are only two possible causes.
1The internal circuits are jammed because of electrostatic charges accumulating on capacitors, or because of a wrong voltage read by the main chip on your monitor controller board. this started the protection circuit.
2 The protection circuit detected a wrong voltage or a broken contact, identified an internal fault and kicked in , starting the flashing light.
If you are in situation one, then the monitor will reset just unplugging power cord for one or two hours,sometimes even minutes.
If you are in situation 2 , then there is an internal fault.
Common faults that can occur are a blown capacitor on power board, faulty inverter board, faulty input board, or a fault on LCD Digital Controller board.
Check also the video cable or any external connection cable, if the cable is shorting, or the connector is bad, you can get same flashing state because of the video cable.
Try moving the video cable, and if the cable is not built in, then also try a replacement cable.
If under warranty contact the manufacturer ringing the number on the user manual
If you want to repair at your own expenses, just locate any good qualified repairer.
Posted on May 04, 2009
Sounds like a bad solder joint on the printed circuit board. Once it heats up then it no longer makes good contact and the monitor goes black until it cools down and makes contact again. You could resolder it if you knew where it was but monitors are dangerous to go playing around with as they can hold very high charges of electricity in their capacitors that are very dangerous. It's a throw away world. Go buy a new one.
Posted on Jun 02, 2009
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