Question about Philips 190B6CB/27 19" LCD

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Volume control is constantly on

The volume control on the screen only allows me to change input and will stay at a constant 0 and wont let me adjust the volume it just keeps changing inputs instead

pls help!!!

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It may be a malfunctioning circuit board controlling the buttons on the front. If it's under warranty ship it back to Philips; if not markgladding on this site sent me the following advice. Standard disclaimers apply and any questions or comments should go to him.
-------------------------2nd hand advice begins-----------------------------

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 circuit 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 circuit 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.

Posted on Aug 06, 2008

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