Question about BenQ FP737S-D 17" LCD Monitor

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Still no display

The voltage output of PQ3RD23 is 3.3V. i've tested all four c5707 transistor. One of them is shorted so i replaced it with a new one. Still no display on my LCD. what could be the problem?

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  • 143 Answers

Is there a diode on the other side of the transistor? That could have gone as well (if my electronics repair hasn't failed me yet!!) That is just a stab in the dark. Sorry I couldn't be more help, but it has been quite a few years (15 at least!).

Posted on May 16, 2008

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There are several reasons. If you find one shorted transistor in a push-pull stage you should always replace both. One might be faulty but not shorted, but when in operation it does the other one in. You might have also missed another shorted part such as a diode or voltage regulator. Hunt around looking at the circuit of the confirmed shorted parts and test or replace anything off that circuit.
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At this point you may be better off to replace the whole board, the four C5707 are transistors, not capacitor. You need to make sure that there are no cold solder joints around inverter transformers lead, check the tuning caps in the inverter output sections.
Replacement board: http://www.lcdrepair.us

http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting

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Found them


If you are referring to the C5707 inverter driver transistors, you can test them in circuit with an ohmmeter. Usually one pair will show shorted although only one may be actually shorted. Normal procedure is to replace the pair that shows in circuit short. If you do not resolder the transformer connections your transistors will short again.
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Your inverter power supply has gone bad. You will need to replace the whole board or replace the the 2sc5707 transistors in the inverter area. Check out this link for installation videos and how to for that model
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