Question about BenQ FP731 17" LCD Monitor

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Help hello, i have same problem here, i have removed the inverter board but am not 100% sure which parts you mean to resolder... there are 4 small transformers near the lamp output edge and one big one near the center. as for transistors i only see 1 standard style (ic702) can you please explain in some more detail... i can send u a pic if it would help.

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  • hthring Jul 25, 2008

    i ended up putting mine back together and taking it to benq where they fixed it, thanks anyway, this description is better.



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Check transistors Q739,740,759,760.These transistors are near the 4 yellow invertors near the backlight connection sockets.Also check fuse Starts with PFxxx.
Please provide feedback and rate solution


Posted on Jul 25, 2008


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1 Answer

Hello my 32" AWA plasma

You should try to resolder the transformers' joints on the inverter board.

Hope this helps!

Apr 28, 2011 | Televison & Video

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Lcd monitor automatic on off

There are 4 bad capacitors involved. It may not seem bulging but one or two are leaking. These are the 4 capacitors. 2 pcs. 470 microfarads - 25v 1 pc 1000 microfarads - 25v 1 pc 1000 microfarads - 10v I replaced them all. Next is to clean the board at the back. I got 91% alcohol and toothbrush and scrub. Concetrate on the 8-pin IC which has colored yellowish paste. Scrub or use a Q-tips buds soak with alcohol and clean it. Next resolder all 4 trasformers. Two on the primary and 2 from the inverter side. Also resolder the 2 transistor/mosfet (3 legs) which is attached to the metal (heat sink). After resoldering, again clean with alcohol by scrubbing or Q-tip buds for sensitive part.
Mine is working fine now. Good luck


Feb 02, 2011 | Samsung SyncMaster 920NW Monitor

1 Answer

When turning the tv on, we get sound but no picture. The screen only has a faint glow to it, meaning that there is power to the screen.

Hello Shelley hi!, its a sign that the inverter board and or the lamp needs replacement. the inverter board produces power to lit the lamp. the inverter board on you TV is bad, making it produce less power, so less lamp glow. Have this replaced by a technician. to be safe, call your dealer for service. follow this link to have an idea. I'm not sure if parts are available. better call your Samsung dealer for proper advice.

Jan 22, 2011 | Samsung LN40A650A LCD TV

1 Answer

Monitor on/off button flickers

The reason why the button of your monitor flickers is because the 12 volts output supply for your inverter board is not stable..
If you have the skills and the right tools for this, Here's what you need to do
1. If your monitor comes with a power supply adapter, open it..check and replace blown capacitor with same value..
2. If your monitor is using a cable power the back cover of your lcd..on the power supply section.. check and replace blown capacitor.
3. Check and resolder the terminals for fixing possible loose connections.
4. On the inverter board section...check and resolder the terminals for fixing possible loose connections, the high voltage inverter usually loose connections when overheat.
5. Other things to check if step 1 to 4 did not resolve your problem. Check and replace burnt high voltage transformer.. Check and replace busted backlight inverter..

Hope this fix your problems..

thanks.. much appreciated if you rate this help.

May 29, 2010 | Samsung SyncMaster 204B 20.1" LCD Monitor

1 Answer

What does f-9 mean

F9 on most modern Kenmores (made by LG) is inverter-related or related to the failure of another part in the high voltage section, such as the magnetron.

Some chatter from other boards:

"F-9 on this microwave IS inverter related. There is a service tech troubleshooting document stuffed in behind the control board cover which has some testing proceedures. My problem was the magnatron and checked out bad with the help of this document. It would run for a few seconds making clicks and then say F-9. It has been working great since I replaced the magnatron PN 6324w1a002c."

"f9 model 721.63764300
Kenmore Elite 36 " over tne counter microwave is supplied by LG made by Gold Star, made in China. It's main problem is the high voltage inverter board supplyed by Sears Parts. If you get a F-9 code on your microwave display screen and the micro quits it's probably this board. Reset the machine by pulling the power plug and waiting an hour. If it is the high voltage board is at fault it will probably fail after 45 seconds of start up. This part is really hard to get at but is less than $100. A qualified technician should be able to remove and repair this item in less than hour. Some techs will quote you $300 labor, don't buy it, it should cost a $100 or less. No need to buy another microwave."

Note: part numbers mentioned in the text above may not the same as yours.

You can find helpful exploded views and part numbers on the
Sears parts site, but once you have the part number, you can often get the parts cheaper here.

Otherwise, you can contact Sears through their parts site link above to arrange service.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Jan 09, 2010 | Kenmore 63683 Stainless Steel 1200 Watts...

3 Answers

Sound but picture goes black after 10 min

is not the ballast. the problem is the control box

Nov 29, 2009 | Polaroid FLM-2632 Television

1 Answer

Hello the connector on back of my tv came loose how can i diy

You need to remove the tuner from the main circuit board, resolder the cable connector to the metal tuner case, and resolder the connection inside the tuner from the connector center tab to the tuner circuit board.

Removing the tuner requires "solder wick," a copper braid that soaks up the solder as it melts so it can be freed from the board.

Resoldering the connector to the tuner case requires high heat from a soldering gun to get it hot enough fast enough to make the connection. A regular soldering iron won't do the trick.

If the connector has been broken off completely, replacements are available from a couple of on-line vendors (I use a company call MCM Electronics

If you are not comfortable with electronic soldering and working on TV's, you might want to get an estimate from a shop for this repair. It should be under $100, depending on the shop's rate.

Dec 09, 2008 | RCA F27450 27" TV

2 Answers

Mitsubishi nxm56lcd monitor

Not sure what the D-sub out of range means.. but if you have to hold a flash light to the screen to see the images it would seem that either your inverter board or backlight lamp is bad.
I would try the inverter board first.. there are numerous places on the web that sell these things.. Just google it..

Sep 06, 2008 | Computers & Internet

2 Answers

Dell 1701FP monitor - power buttons blinking - no display - no white screen

hi my name is joel joely from etech vanuatu limited. my dell LCD monitor is just blinking power light on with orange light and also power switch not working if turn it on or off no display on screen.

my email address is



Sep 06, 2007 | Dell UltraSharp 1701FP 17" LCD Monitor

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