Question about BenQ FP731 17" LCD Monitor

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BenQ FP731 17" Inverter transistors

I have the same problem as another user where my monitor turns on then flashes almost instantly off. You mentioned re-soldering transistors near the inverter transformer. Only problem is, I've got 5 transformers and I'm not sure which one you are referring too..

Are you able to supply the 'component' numbers for the transistors that need to be replaced? I'm thinking you are referring to Q808,Q809,Q815 and Q816. Any help would be appreciated - I'm a novice.. I can take a photo of the power board if that would be any help..

Thanks..

Daniel

Posted by Twigman on

  • sry6 May 24, 2008

    thak same power on led ok no bright

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1 Answer

Samir Shah

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T751,752,753,753 are the transformers to be resoldered ,and resolder Transistors Q759,60,39,40,43,51.
Please check them with a multimeter if you are adept .
Please rate the solution and provide feedback.
Samir

Posted on Apr 25, 2008

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Ibm e74 17 crt monitor screen is black with the indicator light flashing green.


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Jan 24, 2011 | IBM E74 17" CRT Monitor

1 Answer

I have a dell montior model # is 1708fpf and the power light just flashes and no picture same problem as mention above nothing Any suggestions? [email protected] Thank You Parish


More likley to have shorted out transistors in the backlight inverter circuits.
If you are going to DIY and have proper tools and know safety precaution then please read on:
Most common failures in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply (they should be replaced in a set), blown fuses; poor solder joints, 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 to look for: http://s807.photobucket.com/albums/yy352/budm/
Post back what you see inside so we can guide you further and it will help out other people in the future also.

Basic LCD monitor troubleshooting guide:
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide

Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague

Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.


Replacement board: http://www.lcdrepair.us

Dec 01, 2010 | Dell E153FP 15" LCD Monitor

1 Answer

I have a similar problem to one posted a few months ago - flashing LED on the power button, except the monitor does come on after a couple of minutes and the LED stops flashing. bdmrtn said to the other...


Look real close at the solder joints on the inverter transformer pins, and the transitors. What usually happen is that the cold solder joints will mess up the bias on the transistors or causes arcing and that will take out the transistors, you need good magnifier glass to see, you will see ring/cracking around the component's leads.
http://s807.photobucket.com/albums/yy352/budm/Poor%20solder%20joints/
It will get to the point that the transistors 2sc5707/5706, and also still should look for bad caps.
Replacement board: http://www.lcdrepair.us
http://s807.photobucket.com/albums/yy352/budm/Dell%20E173FPb/

Sep 17, 2010 | Dell E173FP 17" LCD Monitor

1 Answer

Monitor is black but if i turn it off on the pic flashes on then goes out


Look for shorted out transistors, cold solder joints, bad caps, blown fuse.
http://s807.photobucket.com/albums/yy352/budm/Dell%20E153FPB/

If you are going to DIY and have proper tools and know safety precaution then please read on:
Most common failures in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply, blown fuses; poor solder joints, 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 monitors to get some ideas what to look for: http://s807.photobucket.com/home/budm/allalbums
Post back what you see inside so we can guide you further and it will help out other people in the future also.
http://en.wikipedia.org/wiki/Capacitor_plague

Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.

Aug 12, 2010 | Dell E153FP 15" LCD Monitor

1 Answer

My monitor just turn on for few seconds (5) and turn off again... I just changed the left side c5707 transistors and they are not working again.


Hello,

The next thing to do is resolder all of the connections on the 4 output transformers that are near the backlight connectors. What is happening is the power supply board is turning itself off when it senses too much current is going thru the board. Over time the solder will heat up and cool down which causes a cold solder joint which leads to poor connections and more current draw. The over current may have already damaged the new transistors so you may have to replace them again.

CCL_Tech
Corporate Computer
www.ccl-la.com

Jun 25, 2010 | Dell E172FP 17" LCD Flat Panel Monitor

2 Answers

I have a 1704FPT monitor that flickers a little bit then dark. Green light is still on. When I turn the power button on and off, the screen shows briefly, but then dark again. I used a flashlight, I...


Hello,

You have a monitor with a common problem. After a few years some LCD monitors will blow a power supply. The problem is caused by parts called capacitors overheating in the confined space of he monitor. If you are good at electronics repair/soldering you can usually fix he problem. Check out a few pictures on my web site www.ccl-la.com/badcaps.htm You can take the back cover off your monitor and look for the bad parts,replace any that look like the pictues and your monitor should work fine. The capacitors do need to be installed with the correct + and -connections, note the stripe on the old one and insert the new one the same way. If you don't want to try the repair yourself we offer a repair service for $35 plus shipping. If your problem is not the capacitors then it would be the backlights and that is much more difficult to replace.

I hope this helps, if so please rate my solution.

Buddy
Corporate Computer
www.ccl-la.com
Over 21 years of computer and printer support/repair

Jul 03, 2009 | Dell E173FP 17" LCD Monitor

3 Answers

Gateway fpd1530 15in flat


There are more than one inverter circuit for this model. One is prone to have poor solder connections in the transistors Q8 & Q10.
Another can be repaired by replacing 2 1uF electrolytic capacitors near the center edge of the board between the lamp sockets.
Monitor Mike

Nov 15, 2008 | Gateway FPD1530 15" Flat Panel LCD Monitor

1 Answer

Power button is flashing green


These models are prone to shorting of the inverter drive transistors, 2sc5707. An in-circuit ohm meter test will reveal which are shorted if any. They should be replaced in pairs even if only one is shorted. Bad solder joints on the transformer can cause them to short so look for bad solder.
Monitor Mike

Jul 14, 2008 | Dell E173FPb 17" TFT LCD Monitor

1 Answer

Benq fp737s monitor dead


check transistors Q739,740,759,760.What you are refering to are capacitors in powersupply section.These transistors are near the 4 yellow invertors near the backlight connection sockets.
Samir

May 27, 2008 | BenQ FP737S-D 17" LCD Monitor

2 Answers

The screen will turn on for an instant and then go blank. If I tilt the monitor forward it stays on.


Hi,

Based on your description it could be a loose connection. Externally, this could either be the power cord or the video cable, internally, this could be on any of the different connectors or less likely, a cold solder. Depending whether your monitor is the conventional CRT or an LCD, then it could be on the regulator board or the inverter.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

May 26, 2008 | Computers & Internet

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