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Repairing BenQ 17″ LCD Monitor
By Jestine Yong on January 31, 2008
I came across a common fault problem in BenQ 17″ LCD Monitor. The problem is have power but no display. Once you has opened the LCD cover, check the pico fuse for open circuit (very common), the push pull transistors C5707 for short circuit and the Buck royer circuit p-channel fet FQU11P06 also for short circuit too. For your information, if you can’t get the FQU11p06 you can always use FU9024N as a replacement. Resolder all the high voltage transformer pins and replace the components above and I’m sure you will bring back the life of this BenQ 17″ LCD Monitor.
You may go to this fairchild semiconductor website to download the spec of the FQU11P06 P-channel FET.
http://www.fairchildsemi.com/ds/FQ/FQU11P06.pdf
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admin
January 5, 2010 at 10:06 am
Hi Gozimat,
You are welcome!
Jestine
Yizhe
January 6, 2010 at 12:05 am
Hi Jestine,
I have the same LCD monitor as the picture you have shown, the Benq FP731. I would like some advice on opening the monitor. I have removed all the screws at the back (5 + 2 for the base). How should I go about prying open the monitor after that?
My problem is that the AC IN port has become a little loose. This causes the power connection to become disconnected sometimes. Occasionally, jiggling the power cord at the port fixes the problem. So I want to open it up to see if can be secured better.
Thanks!
admin
January 6, 2010 at 7:55 am
HI Yizhe,
Try peel off the cover from the bottom with a flat metal. Once opened, then peel the side cover.
Jestine
abhye
January 7, 2010 at 1:41 pm
how to get this books
abhye
January 7, 2010 at 1:48 pm
hi, friend
LCD Monitor has broken, caused petir, i've to check and found ic fet (type 10NK)was damaged on regulator. how to get this component. as you now in my city, i can't found component like that. any component other type to change this
admin
January 8, 2010 at 9:20 am
Hi Abhye,
Please visit http://www.LCD-Monitor-Repair.com
Jestine
admin
January 8, 2010 at 9:21 am
Hi Anhye,
Try search from this link;
https://www.jestineyong.com/?cat=12
Jestine
Muhammad Tahir Hafeez
January 25, 2010 at 4:13 pm
i want ur sports
admin
January 25, 2010 at 8:00 pm
Hi Muhammad,
May i know what do you mean "i want your sports"?
Jestine
admin
January 29, 2010 at 9:06 pm
HI Mike,
Try C5707.
Jestine
mike
January 30, 2010 at 2:33 am
if my c5706 is broken what will i replace it with???
eriel
February 2, 2010 at 9:07 pm
hi justine, im from indonesia. really love this site.
i have problem with my benq fp71g+. my benq always turn on and off rappidlly. after view minutes or hour, my lcd otomatically turn off. sometime i have to push the power button to turn on, somethimes its otomatically turn on. somethime its normal for a several ours then otomatically turn of. then turn on again otomatically. or i have to push the power button to turn it on.
the picture look normal n benq logo shows up when the lcd turn on.
please help me with pic coz im a newbie for electronic repairing.
regards
eriel.
admin
February 3, 2010 at 8:31 pm
HI Eriel,
Thanks. You may need to make sure that the output voltages are good and stable and no bulged caps on the power supply side. If the Mainboard is receiving good voltages then suspect either the eeprom or the MCU have problem. Check also the push button as sometimes a stuck push button (not only the power button) could cause this intermittent fault.
Jestine
Sergey
February 14, 2010 at 10:53 am
Hello.
Thank you for this site. I need your help. I'm reparing my Q7C4, because backlight is
shutting down after few minutes of work. First I've changed C708, it was swollen.
After this action monitor was working well during one week, then the same problems
have been appeared again. I've changed IC801, Q805, Q812, Q808, Q809, Q815, Q816. Also I've changed Q811 with 2N3906 (MMBT3906 was broken). But the problems didn't go. When I turn on monitor, backlight shines, but Q805 and Q812 become very hot and after few minutes of work backlight turns off again.
Can you help me what are the problems and
what should I check. Thanks a lot!
admin
February 14, 2010 at 10:50 pm
HI Sergery,
Have you check the backlight as a bad backlight may cause this problem too. Check also for high voltage transformer dry joint. Make sure there is still supply voltage to the inverter ic after the unit had shutdown.
Jestine
jose
February 18, 2010 at 3:41 pm
I hope you can assist me, I have a BenQ Monitor FP71E.
My problem is that the monitor will not go on,
I press the power button and no results.
after few days I press the power button and the monitor turn ON for hours....
after that the monitor never turn ON when I press the power button
can you assist me.
what can I verify to discover the problem?
Thank you for you time,
admin
February 20, 2010 at 1:30 am
Hi Jose,
Have you check what i have suggested earlier? Any good news?
Jestine
suzaidy ahmad
February 23, 2010 at 12:09 am
hi. can u help me.i have benq g2110w lcd.there is no power and cant turn on the lcd.can this problem fixed and how much coz for the repair.thanks you.
admin
February 23, 2010 at 6:12 am
Hi Suzaidy,
It depends on the parts availability. The cost of repair is between RM180 to rm250.00.
Jestine
jose
February 23, 2010 at 6:02 pm
Hi Justine,
I don't receive the suggestion that you speak in your mensage
.....
admin
February 24, 2010 at 5:13 am
HI Jose,
Could you elaborate because i don't understand your meaning?
Jestine
jose
February 24, 2010 at 4:31 pm
I hope you can assist me, I have a BenQ Monitor FP71E.
My problem is that the monitor will not go on,
I press the power button and no results.
after few days I press the power button and the monitor turn ON for hours….
after that the monitor never turn ON when I press the power button
I verify :
- CN701:
1 - 2.7 ->2.9v 2 - 0v
3 - 4 - 0v
5 - 6 - 0v
7 - 8 - 5v
9 - 10 - 3.3v
11 - 0v 12 - 0v
que quartz : 14.318Mhz ok
can you assist me?
what can I verify to discover the problem?
Thank you for you time,
admin
February 24, 2010 at 11:37 pm
HI Jose,
When it can't turn on that time is there still output voltage supplies from the SMPS? If no then you may have a power supply problem. It could be dry joints, bad caps, bad resistors and etc. If it has output voltages and you can't turn it on then suspect the mainboard problem.
Jestine
Nguyen Hung
February 25, 2010 at 3:22 pm
Hi, Mr. Yong
I have a second-hand 17" lcd screen.
It's normal while I'm using it. The problem is after I shutdown the windows, the screen turns to be White although I tried to press the power button. The screen just absolutely turns off after I unpluged the power cord and then plug in again.
Can you help me to point out its problem?
Thank you in advanced.
admin
February 25, 2010 at 8:43 pm
HI Nguyen,
It seems like either the mainboard (MCU) or the inverter board have problem because when you already shutdown the Windows by right the MCU in the mainboard should stop sending On signal to the inverter board. If the On signal present at the inverter ic then the backlight will turn on and cause white screen. Chances is high the MCU program may have been corrupted. Since you still can see the picture, i guess you continue to use it because it is not easy to program the MCU.
Jestine
Nguyen Hung
February 26, 2010 at 12:03 am
Thank you, Mr. Yong.
I'll do as your advice or go to store and change another one.
Have a good day. 🙂
Naresh
March 4, 2010 at 5:49 pm
Jestin how are you
I have sharp lc 32sh12u tv. power goes on picture comes up work fine for a while and then picture come back need your expert advice what will do that and where to look for please advice
admin
March 5, 2010 at 8:58 am
HI Naresh,
I don' get what you mean by picture come up work find and picture comes back. Could you elaborate.
Jestine
Glenn
March 9, 2010 at 1:16 am
Hi Jestine,
Your website is very helpful. Im trying to repair a benq q7t4 monitor. I cannot find the size of the pico fuse anywhere though. pf801 is the component number on the board. Can you help please??
Thanks
Glenn
admin
March 9, 2010 at 9:59 am
HI Glenn,
YOU can try to put in a 2 or 3 amp pico fuse.
Jestine
Naresh
March 9, 2010 at 3:50 pm
lc 32sh12u tv
tv powers on. I can see picture comes up,monitor text I can see.
this unit work fine for a while then after does not work,nopicture,
no text, no setup manu. but the power light is green.
admin
March 10, 2010 at 8:52 am
Hi Naresh,
Is there supply voltage to the Inverter IC after shutdown?
Jestine
Naresh
March 10, 2010 at 7:30 pm
i DID NOT CHECK. i WILL CHECK AND KET YOU KNOW.
SO YOU THINK IT IS RELATED TO INVERTER BOARD?
i WILL CHEKKH AND LET YOU KNOW
admin
March 10, 2010 at 11:03 pm
Hi NARESH,
Yes, because if no supply to the inverter IC the display will shutdown.
Jestine
Rabih
March 21, 2010 at 11:53 am
Hi all
I have got 2 x BENQ Lcd screens that went dead at the same time with same fault.
Mode: Q9T4 19 INCH ,
Front light changes from orange to green when pc powers up i suppose its another backlight issue?
Best regards
admin
March 22, 2010 at 4:41 am
Hi Rabih,
Not really the backlight problem. First, is the output voltages from the SMPS good and stable? You said it went dead-is it no power, no display or the display appear for a while and shutdown?
Jestine
Naresh
March 24, 2010 at 8:00 am
Good mornning
yes I did . and voltage is their.
admin
March 24, 2010 at 8:35 am
HI Naresh,
Then it could be problem of the backlight. If one backlight have problem the display will shutdown.
Jestine
Andang Mulyana
March 31, 2010 at 1:20 am
I have a LCD monitors BengQ Model: Q7T4 with serial number: ET23709216SLOT. The problem is that LCD is dead Total while inflows, can you give solution what components should I check and replaced
admin
March 31, 2010 at 9:13 am
HI Andang,
May i know what do you mean by "total while inflows"? You mean no power or the display have white screen?
Jestine
Naresh
April 3, 2010 at 10:11 am
I dis mentel every board and connnection. then put is back to gether.
It work fine for 2 day and then. their is no picture. power goes on
some line you can see but no picture. now you say backlight may be problame is it possible to repair or replace? their are two small 1''by 10'' long pcb board is connected to screen from the top that is backlight?
what you thought
admin
April 4, 2010 at 2:01 am
HI Naresh,
After 2 days? Well it seems it could be dry joints problem. Try gently knock on the board using the plastic handle of the screw driver to see if it will shut down again or not. As for the backlight, the best is to compare/replace with a working one to see which of the backlight have problem.
Sometimes a weak backlight may produce intermittent flickering problem. This flickering problem could cause the monitor to shut down.
Jestine
paresh
April 19, 2010 at 3:01 am
hi
i have repairing benq lcd my problm not disply on screen but power on
i found power supply primary voltag is ok but not voltage for secodry side i how
solve my problm
plz. urgent
admin
April 19, 2010 at 4:34 am
Hi Paresh,
If there is no secondary output voltages at all then you may need to check all components in the primary side and you may need to replace the power ic and retest.
Jestine
Jamie
April 21, 2010 at 12:18 am
Another common fault which BENQ do not want to know about is that the fluro's go open and short. This closes them down. Ebay for replacement Fluro's but unable to source whole fitting. We have many her with this issue.
admin
April 21, 2010 at 8:59 am
Hi Jamie,
Thanks for the info!
Jestine
Jonathan
April 23, 2010 at 2:59 am
Damn it! I just tore the fuse out thinking it was the fuse. I should have searched this site first. Now I have to find a soldering gun to fix the fuse holders. I knew I seen something similar about these bulging transistors (C707 and C708). Seen these before in Windows Me computers.
admin
April 23, 2010 at 8:32 am
HI Jonathan,
It is okay, there is always something new to learn everyday!
Jestine
guru
May 21, 2010 at 6:45 am
Hello
Jestine i have a problem with my samsung syncmaster 540n black. When monitor was turned on (monitor vga cable not plug in first), it should have display check signal cable (this mean monitor ok). but in my monitor its Blank (no display) even power was on (LED is blue light).
admin
May 21, 2010 at 8:53 am
Hi Guru,
If there is no supply voltage to the inverter ic then suspect a bad mainboard especially the MCU.
Jestine