Question about BenQ FP737S-D 17" LCD Monitor

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Light is green, but monitor just goes on for a split second then it goes off.

I found a few people with similar problems, but since I have soldered two things in my life I am afraid to break it if I just try random things. Ok so when I turn the monitor on the BenQ logo appears very dimmly and a split second later it dissapears, so from what I read it is probably something with the inverter. I have opened it and have the main circuit board all ready to go. Some people have said that resoldering the tranformer connections might help.The capactors are not bulging or anything so I guess they are fine. So please tell me what I need to do with specifics because I cannot differentiate between all the components on the circuit board. Thank you. P.S. I am very novice, just 2'nd year mechanical engineering, not really a circuits guy.

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Re: Light is green, but monitor just goes on for a split...

Most 17" BenQ monitors share a very similar power/invertor board setup.
This is a very common fault.
First check the 4 small invertor transformers for cracks.
Second there will be 2 rectangular capacitors (usually grey) between a pair of transistors .
These transistors have a code C5707 on them. (2sc5707)
What usually happens is the top capacitor gets cooked from the heat and shorts out the transistors. This in turn can blow the fuse FP801 on the board. (it is a 3 amp fuse, soldered in type thats either black or yellowish in colour.

To fix this you need to relace the capacitors, (0.22 picofarad 250 volt) probably the transistors, and maybe the fuse.
To test the transistors use either a multimeter or continuity tester on the legs of the transistors. If they show a dead short between any pins they will need to be replaced.

Posted on Jun 26, 2008

Re: Light is green, but monitor just goes on for a split...

Got the same problem if you have a reaaly bright light going over the screen you can dimily see everything ( very dimmly ) i not a comptuer expert but im pretty sure the backlight inthe moniter is stuffed

Posted on Aug 23, 2007

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Re: Light is green, but monitor just goes on for a split...

Density, I agree from what you have described it might be the inverter board, however, I wouldn't start tearing and replacing based on your description just yet. With the computer on and the monitor power LED green shine a flashlight in the lower left hand corner of your screen. Look for the Windows ?Start? button, if your backlight and/or the inverter board is not working you?ll see a faint ?start? button if you look closely. If that is the case I wouldn't recommend randomly re-soldering or replacing parts on the inverter board. Unless you physically see damage or have the ability to trouble shoot the failure to a discrete component I would suggest replacing the entire board if it is economically worth it. Depending on the monitor this is usually an economically repairable problem. Let us know if you have any other questions and please don?t forget to rate this posting.

Posted on Apr 26, 2007

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I have a Dell monitor model #1901FP when my computer comes on the monitor comes on as it should. After only a few seconds the monitor goes blank. You can turn the monitor off then back on the monitor...

The solution I am about to describe refers to a backlight problem, which is most common in Dell 15,17 & 19" monitors. The symptoms are as you describe:
  • You power on the monitor, the green on/off switch illuminates and the display works for approx 1-2 seconds and then goes blank.
  • The green on/off switch stays illuminated but the screen remains blank
  • If you shine a torch into the LCD matrix you can see the display being rendered faintly
  • Switching the monitor off and then on again illuminates the display again for 1-2 seconds before going blank again
This is a backlight fault and is most likely to be caused by the failure of two of the four driver transistors used to light the lighting tubes in the LCD Matrix. This fault is easy to repair if you (or a friend) have a soldering iron and a voltmeter.

Inside the monitor there is an inverter board that acts as a power supply for the monitor and the logic necessary to control the backlights (illumination and brightness control). There are four lighting tubes, which are controlled by two lighting circuits (two lighting tubes per circuit). At the heart of the inverter board is a chip that monitors feedback from the two lighting circuits and closes the back-light circuit down if either of the lighting circuits fail, thus any component failure will exhibit the same symptoms.

The transistors which fail most often cost pence to replace (types C5706 or C5707). However, their failure in unlikely to be the cause of the problem. My first crack at fixing this fault, by replacing the transistors, resulted in them failing again within 24/48Hrs. The cause of the problem will be dry solder joints or loose connections on the high-voltage side of the circuit, usually on the backlight transformer in the effected circuit. If you re solder each of the connectors on the transformer you will save the transistors from blowing again - the transformer generates 1,400Volts for the lighting tubes and at this voltage, arcing across the a dry solder joint, will quickly destroy the transistors again.

No soldering iron? - A complete inverter board replacement is also reasonably cheap and easy repair. These are widely available.

Sorry of this is more detail than you expected but it may help others reading this article.

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The amptron monitor will flick on for a split-second (long enough for me to momentarily see the desktop) with the center power (green light) lit...for a split-second. then its off for a few (3-5) seconds....

90% of the failed LCD monitors are due to bad capacitors (bulging top/seal, or leaking) in the power supply, or bad solder joints, etc.. You can look for them first. Please see the pictures here to see what to look for:
Please post back so we can guide you further and it will help other people also.

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Monitor comes on for a split second , and then off

Most common failure in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply, failed inverter circuits (blown fuse, shorted transistors, shorted/open transformers), bad lamps (poor solder connections or worn out lamps). You will need to open it up and inspect the inside, see example of failed Dell monitors to get some ideas what goes wrong:
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