Question about BenQ FP71G 17" LCD Monitor

1 Answer

INVERTER POWER CARD

Hi there,

Not too sure where in the U.S to get replacement transistors on this board. Are there any compatible transistors that can be used? Any ideas would be appreciated.

Thanks.

Posted by on

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    Hot-Shot:

    An expert who has answered 20 questions.

    Corporal:

    An expert that hasĀ over 10 points.

    Mayor:

    An expert whose answer gotĀ voted for 2 times.

  • Expert
  • 89 Answers

You did not specify the transistor. But this site may help. You can download a quickcross reference software that will give you the replacement parts that you need.

http://www.nteinc.com/

Posted on Sep 15, 2008

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Seiki SE50FY10 has sound but no picture, flashlight test shows picture. Not sure which board to replace


Back - light problem.Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis.If you wish to get some details; check the site linked here.Surf the site with patience.Pull up older posts.It will be best to replace the inverter board as card basis.
http://electronicshelponline.blogspot.com/
To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS].In such cases, the power supply board might need replacement.To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself.If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board.If this is the case, you have to replace the main board.

Jul 28, 2016 | Seiki SE50FY10 50-Inch 1080p 60Hz LED HDTV...

1 Answer

Sony Bravia KDL-52XBR TV - have sound but no picture


Hi mstevens376,
Power on the unit in the dark room then shine with the flashlight directly in the screen, you will barely see the images. This is because your backlight is not functioning. The following reason is the caused.
1. Power supply - missing B+(supply voltage) coming from this board feeding the inverter board. This is caused by faulty transistor, dried/leaky electrolytic capacitor, open fusible resistor.
2. Inverter board - even the B+ is good from the power supply, if the fuse, driver transistor, driver transformer is faulty no output to the backlight resulting to black picture.
3. Busted backlight - even inverter board is good but if this is busted resulting to black picture also.
Diagnosing the fault is technical and if you don't have necessary tools and test instrument and can't fix it yourself, I would advice you to look for an experienced technician to isolate the problem.
Hope I helped you.
Have a nice day!
Thanks for using Fixya.

Mar 31, 2011 | Sony KDL-52XBR4 LCD Monitor

1 Answer

Viewsonic VX924 monitor SMPS failed. Replaced all bad capacitors and have found that one pair of inverter driver transistors has failed. They are marked as DKQR (They are apparently Rohm 2SC4672...


When the DC filter caps no longer filter out high frequency AC, that AC will be fed through out the circuits and cause damages such as the inverter frequency will be running at the wrong frequency and caused overheating.
The service manual does not show the sch of the power supply/inverter board because it is not designed by Viewsonic.
http://s807.photobucket.com/albums/yy352/budm/Viewsonic%20VX924/

Mar 27, 2011 | ViewSonic VX924 19" LCD Monitor

2 Answers

My LGFlatron W2234S won't come on and instread the power light just flashes. Can you tell me what to do?


the blinking light of the power led means that the start voltage was not working properly, if you are a trained tech you can repair this monitor, but if you are a simple user it's dangerous, there is high voltage inside. cause of blinking light :
  1. puffed capacitor on the power supply
  2. broken FBT on the inverter board
  3. broken transistor on the inverter board
solution:
  1. replace or repair the power board
  2. replace or repair the inverter

Dec 21, 2010 | LG Flatron L1951S 19" LCD Flat Panel...

1 Answer

Dim get on just four second and before 2 transistor 5707 is broken and i replaced


Did the new transistors shorted out? You maut make sure to checkt the gray tuning caps in the inverter output sections, if they are bad, the inverter will run at the wrong frquency and burns uo the transistors. You also need to look real close at the solder joints in the inverter sections, especially around the inverter transformers.
12vdc is OK?
http://s807.photobucket.com/albums/yy352/budm/Dell%20E173FPb/

You may be better off getting the replacement board:
Replacement board: http://www.lcdrepair.us

Hopefully the lamp assemblies are OK.

Basic LCD monitor and TV 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.
Or www.digikey.com just make sure to use caps with low ESR, 105c, high ripple current, long life rating such as PANASONIC FM or FC series.

Dec 16, 2010 | Dell E173FP 17" LCD Monitor

1 Answer

The power button on my monitor flashes but will not trun on


There is a chance that you may have a couple bad capacitors on the power-inverter board but more than likely the problem will be a shorted out transistor. There are 4 on the inverter side of the board and one set may have gone bad. Capacitor problems may have caused the transistors to fail. Transistors are probably c5706 or c5707 and are black with 3 legs going though the board.
You would have to open it up to check and would need an ohm meter to verify if the transistors are shorted out.

Aug 18, 2010 | Dell 1703FPt 17" TFT LCD Flat Panel...

1 Answer

Dell E173FPs LCD screen (4 years old) is blank, power button is blinking green. I have read numerous articles about the same problem on similar models (E173FPc?) caused by poor solder connections at...


Replacing transistors would be the last thing in that troubleshooting. First, check all electrolytic capacitors if there are any of them "bubbled", replace those. Next, if there is the fuse used for supplying DC voltage to the inverter area, take it off and check if LED will still blink as before. If there's no such fuse, you can cut the trace, supplying DC voltage to the inverter, another words, you need to unload inverter from power supply and check LED behavior then, if it will stay steady, then next steps will be to troubleshoot the inverter, otherwise, using ohmmeter ring all capacitors and diodes in the power supply part, especially connected to PWM chip at primary side of pulse transformer. By the way, what kind of chip is there?

Apr 05, 2009 | Dell E173FP 17" LCD Flat Panel Monitor

1 Answer

BenQ FP731 17" Inverter transistors


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

Apr 16, 2008 | BenQ FP731 17" LCD Monitor

5 Answers

BenQ FP51g LCD monitor


Dear Friend:
There is a Switch transistor to power on -off the hi voltaje for lights. Check 15V from power source go to this transistor colector, Using soldering Iron, make a juntion between colector and emiter, to short 15V to Hi voltaje power. I´m fixing 10 monitor the same trouble. I will remove a liter transistor.
Late I will post here the driver transistor number, and the replace number transistor I will use.
Pictures , etc. Best Regard

Feb 16, 2008 | Proview PL713S 17" Flat Panel LCD Monitor

5 Answers

BenQ FP71G+


We recently come across this problem - and like many others - looked online for a solution without much luck. So it was a clear case of fault finding. The symptoms of the indicator changing from amber to green on signal indicated a problem with the powersupply/inverter board, and not the smaller signals processing board, so that's where we started. On careful testing it soon became clear that the black picofuse (just above the main transformer) was blown. This indicated a major fault in the backlight driver circuit. There are two independant yet identical circuits that drive the backlights - this made testing easy. We found that the two driver transistors marked C5707 were almost completely shorted. You will identify these as being two of four identical black components with a built in heat sink at each end of a grey 0.22 Microfarad capacitor - looking much like bookends! Replacing these C5707 transistors with BD139 transistors (Note: these are constructed mirror image to the original transistors - fit them backwards to the original transistors !) and replacing the 3 Amp picofuse with a 1 ohm 1 watt resistor completely solved the problem ! - Colin Knight, Radtvid Electronics, South Africa.

May 05, 2007 | BenQ FP71G 17" LCD Monitor

Not finding what you are looking for?
BenQ FP71G 17" LCD Monitor Logo

63 people viewed this question

Ask a Question

Usually answered in minutes!

Top BenQ Computers & Internet Experts

Brian Sullivan
Brian Sullivan

Level 3 Expert

27725 Answers

Tony

Level 3 Expert

2598 Answers

Matthew Spark
Matthew Spark

Level 3 Expert

1066 Answers

Are you a BenQ Computer and Internet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...