Question about Lenovo 9165AB6 Monitor

2 Answers

I have 12 Lenovo 9165-AB6 LCD's

I have 12 Lenovo 9165-AB6 15'' LCD monitors all with the same problem.
The leads going to the backlight from inverter (pink and white) are leaking voltage directly to case (ground). Seems to always come from the top backlight.
It is not the main board and the ''leak'' comes from the cable itself.

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  • TechUsed Jul 29, 2010

    We are a REPAIR SHOP, please keep in mind we have 12 of these monitors....all with the same problem. The voltage leak is found INSIDE the monitor (with the back off). I am not talking about the VGA cable, it's the pink and white inverter cable coming from the backlight.

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2 Answers

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  • Master
  • 670 Answers

I would try to isolate the source of this leak. It either comes from the backlight itself or from the inverter board. I would start with the inverter board first, by unscrewing it from the case and place it on an insulating matterial and see if that eliminates the source of the leak. If it does not, then see if physically removing the backlights from the LCD fixes it. It has to be light, the wires or the inverter. Since all 12 does this, it probally a manufacturing defect. Hope this helps.

Posted on Jul 29, 2010

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  • Master
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Hi, if the cable is leaking i advise you to replace it, for reasons such as it is dangerous to you while trying to fix it,( 2) it is armful to the computer which the monitor would be connected to,( 3 ) it is harmful to the individual who would be using it, the monitor can be destroy if there is a leak of current, so you should change the cable.

Posted on Jul 29, 2010

  • 2 more comments 
  • TechUsed Jul 29, 2010

    No, I am talking about the small Pink and White cable inside the monitor that connects the backlight to the inverter. I would guess the problem is in the backlight but am looking for a fix for it. It's new to me.

    Ron

  • Hilton Bristol Jul 29, 2010

    Try this option,
    The computer's monitor is essential to the unit's operation. If the PC is having monitor power supply issues, there are a number of things you can safely try to troubleshoot it before you call a technician. Remember to always turn off the computer and monitor and unplug it whether you think its getting electrical power or not. Never open a monitor, even if it has no power source. A CRT monitor has a capacitor that can store enough electricity to kill a person. There is nothing user serviceable inside a monitor anyway.


  • Unplug the monitor from its normal plug in and try it in a difference receptacle. The monitor's switch should be in the "On" position.


  • Step 2Inspect the back of the monitor. Make sure to push the power cord firmly into the back of a flat screen monitor. A CRT monitor may or may not have a cord that is removable at the back of the monitor. Some power cords have fuses. If yours does, replace the fuse by following manufacturer's directions. If you see signs of wear in the power cord, replace it.


  • Hilton Bristol Jul 29, 2010


  • Push the monitor's cable to the CPU firmly into the back of the monitor as well as the back of the CPU so the monitor can receive a signal from the PC. Determine if there are any bent pins in the signal cable connector. Replace the cable if it shows signs of wear. A cable longer than five feet can cause power issues, so keep the distance between the CPU and the monitor within that range.


  • Step 4Adjust the brightness and contrast levels on a flat screen monitor if the power light shows green but there's no image on the monitor. No image on the screen may look like there's no power to the monitor when the monitor is actually working properly.


  • Step 5Wake the computer out of standby mode if the power light shows an amber color. Move the mouse or touch any key on the keyboard. If the screen goes blank too quickly, you can reset the length of time that must elapse before the computer goes into standby mode through the control panel. It's also possible to turn standby mode off entirely.


  • Hilton Bristol Jul 29, 2010

    Connect the monitor to another PC if possible to see if the monitor is the problem or if it's an additional problem with the cables connecting the monitor and the PC.

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    Have someone to help you , replace the electronic components

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    One may have to use a Desoldering Tool , Soldering Iron

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    T42p display lights for a couple of minutes through startup then goes dark


    But fan still runs, and it sounds like the harddrive is spinning?

    Diagnose.

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    http://en.wikipedia.org/wiki/VGA_connector

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    Press, and hold down on the Fn key, and at the same time tap once on the F7 key. The F7 key is the Display Toggle-Over key.

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    Since the display goes dark after a couple of minutes, I can tell you the problem is the screen Inverter, or Backlight.
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    90 PERCENT OF THE TIME the fault is a bad screen Inverter.

    Primer:
    An LCD screen cannot produce light. It needs an additional light source.
    A Backlight is the additional light source.

    A Backlight can be a CCFL, or a series of LED's.
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    The Lenovo ThinkPad T42 series of Notebook PC's, uses a single CCFL for a Backlight,

    http://www.screentekinc.com/IBM__ThinkPad__T42-series-laptops-lcd-screens.shtml

    A CCFL is a Cold Cathode Fluorescent Lamp. (Bulb)
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    [Average thickness is 2mm. That is a little larger than 1/16th of an Inch.
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    A screen Inverter converts the power from the laptop, for the LCD screen, and Backlight.

    (Older versions of backlighting that used a series of LED's, used a screen Inverter. Newer versions do not. For these replace the LCD screen)

    A screen Inverter and an LCD screen are a MATCHED unit. Make sure you get the correct screen Inverter, or LCD screen, when buying.

    Primer over.

    One example of a screen Inverter for the T42's,

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    Pictorial guide for replacing a screen Inverter, in a ThinkPad T42 series of Notebook PC,

    http://www.insidemylaptop.com/replace-screen-inverter-in-ibm-thinkpad-t40-t40p-t41-t41p-t42-t42p-laptops/

    http://www.laptoprepair101.com/laptop/2007/01/31/replace-screen-inverter-fix-backlight/

    Lenovo Support link to the Hardware Maintenance Manual, for the ThinkPad T42 series of Notebook PC's,
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    Click on the bold black subheading -
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    It is a PDF file.
    It may take up to 30 seconds before the first page comes up.

    For additional questions please post in a Comment.
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