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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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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My monitor was just blinking folowing the thunderstom some days back and I tried to replace some 4 capacitors coded C5707,and it comes on but abnormal display and then the replaced transistors burn out...


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

Failed TV and Monitors: http://s807.photobucket.com/home/budm/allalbums
http://en.wikipedia.org/wiki/Capacitor_plague

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Display not available after a few second....i already replaced tl1451acn inverter ic, back light , , ballast capacitor (replaced)...the only one not replaced yet is high voltage transformer (4 pcs), 2...


Replace the high voltage transformer. It is the ballast for the backlight.. If you could pinpoint the one that's overheating then that is the one that needs replacement. Much better if you will replace the four transformer...


Hope that answer your question..
Much appreciated if you could rate this help. thanks.

May 21, 2010 | Dell E176FPB 17" TFT LCD Flat Panel...

1 Answer

My monitor wont turn on and i kneed to turn on this monitor.


Common problem with this monitor is bad soldering works on the four inductors on the inverter board, you should also check the four transistors (c5707/5706) for short also, see pictures here: http://s807.photobucket.com/albums/yy352/budm/HP%20F1703/

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1 Answer

Monitor dark but can see image in background


if u have warrenty then immediately contact u r dell service.
he check the problem and replace new one.

i also suffer same problem.

Jul 28, 2008 | Dell E173FP 17" LCD Monitor

1 Answer

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.
Monitor Mike

May 30, 2008 | BenQ FP737S-D 17" LCD Monitor

2 Answers

Please help me.


checked the horizontal output,a big transistor near the flyback trnsformer, if it is shorted replace it,,,,

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LED's blinking, no video


Your C5707 transistors in the monitor have failed. Suggest replacing all four with the Sanyo C5707 transistor. A common problem.

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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
http://www.lcdrepair.us/Installation.html
They also sell the whole board as well as repair kits

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You have a serious problem. ie. only the back light is working in your monitor. You might need to replace the TFT associate components.

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Horizontal output transistor keeps failing


The horizontal output transitor is always connected to the primary winding of the flyback transformer (via collector) and also to the horizontal deflection coil via an electrolytic capacitor. The most likely suspect for damaging the transistor is the fylback transformer. In some countries there are electronic stores that test flyback transformer by winding a few turns on the ferrite core and applying a test voltage. This test will only test the secondary. The primary winding is difficult to test for turn to turn short because the resistance is quite low and you do not know the 'good' resistance.

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