Question about BenQ FP731 17" LCD Monitor

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Monitor blank hi1 I'm ykeong fr malaysia.I'm having the same problem.All the c5707 is ok I also measureed PF751 fuse n is about 90 ohm.Is this reading ok cos i thought all fuses should have very low ohm

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It's open if it shows 90ohms.
Also remove all 4 2Sc5707 transistors and check.
Also invertor transformer is dry solder ,Resolder all pins of transformers.
Samir

Posted on Feb 27, 2008

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Dryer runs but does not heat.


Hi.

Check the thermal fuse. The fuse can be tested reading impedance.You can replace the fuse straight away, or you can first test it using a multimeter set on Ohms. If the multimeter reads Ohms infinity when you touch the fuse contacts with the probes, then the fuse is gone. A good fuse will read zero or low impedance.

If the fuse is OK, then you can have a defective thermostat.
In the same way you test the thermostats, thermistors or cutoff located in the heating group, near to fan and element. If they are OK, then they will be conductive at room temperature and will read zero Ohms. If they are bad they read open (infinity). You need to disconnect the part's contact to test properly.

The rest depends if the dryer is electric or gas.


On electric dryers you test the heating element. The heating element is tested in the same way. Set multimeter on impedance, disconnect element, and touch contacts with multimeter probes. If it reads open, then element is gone. A good element reading depends on the specific model. Most washer-dryers, including Whirlpool and Maytag read between 10 and 20 Ohms.


With gas appliances you need to test the ignitor, then coils and then the flame sensor. The ignitor is the most common cause for the problem. Heating coils problems are also common. The flame sensor does not fail very often.

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1 Answer

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Why the cos of 90 is -0.44... ?? and the tan sin its'nt correct in the calculator what can i do ?


The trigonometric function evaluations depend on the angle unit you are using: degree, radian, grad
While cos(90 deg)= 0,
cos(90 rad )=cos(90* 180/pi degrees)= -.448073616

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Did you check the fuse PF751, it should be less than 1 Ohm?
Also look for cold solder joints.
http://s807.photobucket.com/home/budm/allalbums

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1 Answer

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Flashing power LED light means you may have shorted (Emitter to Collector) out transistors (c5707) or bad fuse (fuse has high resistance) PF751. Those are what you need to check. see pictures here: http://s807.photobucket.com/albums/yy352/budm/Dell%20E173FPb/

http://s807.photobucket.com/albums/yy352/budm/Dell%20E15x%2017x%20series%20PWR%20INVERTER%20BD/

Post back what what you find so we can guide you further.

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This means the magnetron is either bad, is not receiving the high voltage it needs (failed diode) and/or the fuse is blown.
You can trouble shoot this yourself with the help of a cheap digital multimeter and a reading of the Chinglish instructions that come with it.
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BenQ FP731 17" LCD Monitor Problem


Connect it to another device, if you get the same result the backlight is bad! These can be replaced, but can be costly!

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hi. i had the same problem and fixed it. the problem are the 4 transistors (C5707) one of more are shorted (Q739,Q740 and Q759, Q760). Also the fuse PF751 (3a) has to be replaced in most cases. In my case i replaced the fuse and 1 transistor (C5707)

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