Question about BenQ FP71G 17" LCD Monitor
When i turn on my pc the orange light on lcd turns green. It stays green but no display.
SOURCE: BenQ LCD 17 inch Monitor
I wonder if this has a backlight in it. Most/or all LCD flatpanel displays use a backlight in them, namely a small florescent tube (a tiny version of the office florescent lights). If this is burn't out, or the little power supply which runs it dead, you will have a black display. The image is actually there, you just can't see it, except perhaps faintly when external light hits it just right. The display must be disassembled to check this light. If you have tech savvy, and some equipment, voltmeter, maybe an oscilloscope, you could check it out. Where to get a replacement lamp? Google it... perhaps the manufacturer.
Posted on Sep 17, 2007
IT MUST BE A DPI.IF UPPER THAN 60Hz THE PROBLEM WILL BE OCCUR AGAIN.I THINK
Posted on Oct 04, 2007
Different faults here.
First fault is no power, it is bad capacitors on the power board.
Second & third faults are the inverters. (power but no image visible, but feint if you shine a light into the screen)
Check the 4 transistors on the main power board for shorts.
If you are unsure what that means, then take it to your local TV technician, he should be able to solve it fairly cheaply.
Hope that helps.
Posted on Apr 09, 2008
Did an independent diagnosis before finding this, and came to same conclusion. First found fuse PF751 was open circuit (3A black plastic fuse, not glass) over close to main heat sinks. When I replaced that with a fine fine strand of wire (for testing) then I saw Q759 (C5707) get hot. Checking the others shows that they should be driving into about 420 ohms on the primary side of the transformer for the flourescent lights (backlights) but on this one it was less than 1ohm. I've unsoldered the Q759 and now I measure 420ohms here too. Now I need to find a new C5707 or equivalent...
Posted on May 17, 2008
I had the same problem and found that Q808, Q809 and Q805 had failed and which if left long enough can also cause PF801 to fail. I also replaced all of the electrolytic capacitors during the rebuild as it was only a few dollars to do so.
Although in my case Q815, Q816 and Q812 were fine I suspect that they may also fail in time.
Here are the parts which should be available at most electronic stores or online.
Q808 & Q809 - 2SC5707
Q805 - IRFU9024N
PF801 - 3 AMP PICO FUSE
Posted on Jan 22, 2009
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