Question about HP Compaq WF1907 Monitor
I have this monitor its works but when i tried to open a porgram or i switch off the monitor and put it back on it would flash and goes blank i have to keep pressing the power button on the monitor a couple of times before it come s on
If you still have this monitor type, you are obviously no longer under warranty and need some help, not "smart alek" or "return" it advise.
The issue is with the power board that feeds the inverters which in turn power the CCFL bulbs. This monitor incorporates the power board and inverter board into one unit. If you have ruled out loose wires at the bulbs, which makes no sense if they are coming on for a bit anyway, then check this:
On the power board you will see some "mosfet" switches that are glued to an aluminum heat sink. They are a black squarish chip soldered to the board and using an aluminum heat sink to dissipate heat. One in particular is screwed to the heat sink and this is your culprit. Take the screw out and carefully bend the chip away from the heat sink. Clean all the old thermal grease off both items and replace it with actual computer thermal paste. In my case I use "Arctic Silver". Place a small bead of paste diagonally from the lower corner of the switch to the upper opposite corner then carefully bend back in place and replace the screw. Give the paste a day to fully cure then reassemble the monitor. That is it! I have repaired 6 as of this posting and all are still working with no image loss. Keep in mind, this is only a repair suggestion for an issue of the loss of backlight. Power light stays on, image can be seen with a flashlight shined on the screen and if turning monitor off and back on the screen looks normal for a few seconds.
Now those of you that want the "why" behind all this: Mosfet's are used to turn on or off a device like an on / off switch. Power to one side, device connected to another side and a trigger to connect the two together. On this monitor design voltage goes to the mosfet and waits for the trigger (hey I want to see something on the screen message) to close the switch thereby passing power on to the next device which is the inverter circuit. Power hits the inverter circuit board and it swings into action inverting power from AC to DC to run the CCFL backlight bulbs. This monitor has two inverters each running two bulbs for a total of 4 bulbs. This light travels through fiber optic style plastic that illuminates the lcd image from behind (thus the name backlight) and viola!! Image.
Posted on Oct 15, 2011
To all that have this problem with the HP W1907 Call HP and demand an RMA, It is a hardware problem. A defect in the monitor.
Posted on Jul 14, 2010
I had the same problem. Screen would often go blank when entering or
exiting a program, usually a game. Happened in both DVI and VGA modes.
Pressing MENU then SELECT would sometimes be enough to bring it back
(monitor would switch to inactive input, then back, the video would
reappear but often re-disappear in one second). The blank screen was
actually an extremely dim image. Plugging cable into known good monitor
showed video signal was fine. New drivers downloaded, no help. Powering monitor off and back on would often be required.
The solution: I returned the monitor to the store and exchanged it for a new W1907. It works!
Posted on Jun 27, 2008
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Posted on Jan 02, 2017
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