Broken BENQ FP731 LCD Monitor

One other thing, I can see faint XP menu showing when I look at the screen at specific angles so the backlight is just shut down I asume.

The HV inverter or the CFL tubes are going bad.

These things come in my shop and its suprizing how many different branded ones all have the same insides .

I just fixed 3 Proview monitors that did exactly what yours does . Each monitor had a weak capacitor on the inverter board .

Others i see have had several bad capacitors in the power supply .

In these monitors, it is common that the backplane lamps and the backplane power supply wears out. You can call or email the BenQ distributor for your area to see if they would sell the parts, or supply service for your monitor. In some of these screens depending on how they are designed, the backplane lamps are not replaceable.

In most cases we found these monitors more feasible to replace than to service.

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JANA _____

I have a BENQ FP731 monitor that does not work correctly and was wondering if it is worth fixing.

When you turn it on the power light comes on, you see the momentary BENQ logo flash (screen looks normal) and a second of video from the computer and then the screen goes black. When the screen is black the power light stays on and is green, if you turn off the computer it goes into yellow standy. I asume the signal section is working, but something is shutting down the LCD. If I turn it off and turn it back on with the power button it does the same logo + 1sec of video then black screen again.

Any ideas? Is this a common fix?

couple of questions for this one. I to have a benq with a back light problem and am trying to get it to work. so I was wondering a: which caps should I be looking at that might be faulty, and b: how to tell if it is in fact the back light that has gone bad, and not the board. so I guess i am asking what the voltage at the pin outs should be if the board is working, and the backlight is not. kallita If you really want to talk to me - just eat the spam

I fixed it, needed two shorted transisters replaced and a couple capacitors.

On Sat, 2 Aug 2008 14:03:06 -0700 (PDT), Powermac put finger to keyboard and composed:

I had the same problem in a Dell monitor (rebadged Benq). It seems that the 2SC5707 transistors are not an uncommon fault.

- Franc Zabkar

As long as it outlasts the warrenty the manufacturers don't care it seems about build quality.

Also need to redo cracked solder on the inverter transformers or the transistors will blow again

Do you have instruction and what capactors ( location and transitors you changed and where to find them. I have the exact same problem and want to fix it any help would be appriciated

On Wed, 17 Sep 2008 13:52:23 -0700 (PDT), Ash put finger to keyboard and composed:

Change the 2SC5707 transistors and electrolytic caps in the inverter section. Also check the 3A picofuse, and resolder all transformer pins.

- Franc Zabkar