Question about IBM ThinkVision L170 17" LCD Monitor

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Backlight not working on the ibm lcd l170

It flashes when i turn it on.one flash and no more.i know its inverter.but instead of transistors it uses some chip(two of them),it has 8 legs,4 on one side are soldered together and that lead goes to transformer same on the other chip , and other side of chips have 1 leg 13V+,one is 13V ground,one is blank and one is +5v i suppose this could be an oscilator chip,but i am not sure...
i cant read what it says on him because it is fried...with what should i replace them?could that be an ordinary n555 oscilator?

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  • kenny258 May 11, 2010

    What control IC on it (BIT3105 ?)

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Check here may help you "http://www.fairchildsemi.com/ds/FA/FAN7317.pdf"

Posted on Nov 02, 2008

I dunno what ic,because it burned and i can't see the markings!!!

Posted on Oct 31, 2008

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I have an image with the flashlight, but no backlighting on my IBM 6734 lcd monitor


The inverter module is bad or the back light behind the LCD screen has stopped working, I would suggest an estimate if you decide to have it repaired.

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IBM Think Vision L170 Monitors. I have a couple with the same issue. Power them on, and the IBM logo flashes for a second, then a blank screen. The indicator LED is green. Powering off/on doesnt...


check for bulging capacitors on the power supply board.if any are bulged their bad.mine was blinking ibm logo i found 2 capacitors bulged i replaced those it works fine.

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When powered-on, and *NOT* connected to a computer, most ThinkVision LCD monitors will flash, for a few seconds, the IBM ThinkVision "logo", before going into "power-saving" mode. If you don't see that, then it's time to spend about $120, and buy a new 19" (not 17") LCD monitor.

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Check the four transistors (c5707/5706) in the inverter section for shorts, board looks like this? http://www.lcdrepair.us/e152-e153fpb-inverter-power.html

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Hi...there,

It's seems your Thinkpad need a new inverter, due to a backlight inverter burnt out. Get a new one or repaired it. Good lucks!

Sep 06, 2008 | IBM ThinkVision L170 17" LCD Monitor

1 Answer

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The entire Thinkvision series of monitors have been plagued by capacitors on the power supply board failing.
This sounds worse then it is. For the most part they only fail well after their warranty period, so it's not a design flaw, just old age.

The repair should not cost alot and would be worth a trip to your local computer/TV repair man.

Hope that helps =)

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Looks like you have a shorted IC ot transistor on the LCD layer of the panel.

If you remove the screws from the back of the panel and look underneath, you will see the circuit the main board plugs into. Usually there are a few components on this pcb that can go bad. Replacing them is a little hit and miss. If you can identify the component, you might stand a chance. I had a unit do this, and when I looked at the lcd pcb there was a shorted smt transistor. It was burnt, but I was able to remove it without damaging the board.
I managed to replace it twice with two similar transistors, but the panel still caused the power circuit to cycle when I plugged it in. Although I couldn't find any other shorted parts, the small smt ICs on the board could have had internal shorts, or the transistors I used to substitute were completely wrong for the circuit. Since the original transistor was burned, I could not identify it in any way.

The only hope for your monitor is to identify and replace the bad smt component on the LCD board, or replace the lcd layer itself. I've done this a few times, but it requires another of the same panels, one with a bad backlight perhaps. If you are careful enough, you can remove the metal frame assembly from the panel (there are usually four screws, two on each side). You will have to "unsnap" the outer frame from the inner frame all the way around the outside.
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Hi you can inspect that what's wrong with your monitors. After you turned it on and the screen went black, you have to check that if you can see the image on the screen or not by shining a flashlight into the screen, not directly but find the best angle to the screen and take a look very closely. If you can see the icons or any image, there will be a minor problem. This is because of the lamps inside screen. Some of them were broken and it is very easy to replace. If you cannot see anything on the screen, there'll be some problems with inverter board. If you have soldering tool and want to fix it by yourself, check the caps first. It may cause this problem. Some caps might show leaking or burn spot on the board because of too high temp. If you don't have soldering tool, you better go get a technician to do so. Hope this help!! If anything I can help you with, feel free to let me know.
Thank you,

Mar 08, 2008 | IBM ThinkVision L170 17" LCD Monitor

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