10-04-2014 05:09 PM
I am having a problem with a ThinkPad Helix and was looking for some advice on the troubleshooting process. The tablet was dropped and it suffered some damage. When I received the tablet I noticed that it still powered on but there was no video. Upon closer inspection, I noticed that the monitor is still displaying video but it is very dim. When I shine a flashlight to the monitor I can see the windows logon screen and the touch panel recognizes me tapping the screen.
The first thing that I tried was replacing the cables that connect the monitor to the motherboard as some of them looked like they had forcefully been removed. This had no effect on the issue as the monitor was still very dim when I powered it on.
I thought that the monitor was the problem and decided to replace the entire screen assembly. I was able to get another monitor that matched the part number of mine and swapped it with the old one. When I turned it on after swapping the monitor I stil the had a very dim screen. If it wasn't the monitor or the cables that connect the monitor to the motherboard then the only thing that was left was the motherboard.
Again, I found a replacement motherboard for the unit and swapped it. When I powered it on I still had the same issue as before, very dim video. I am still unsure as to what could be causing the issue and any help would be greatly appreciated. It doesn't look like the thinkpad helix has an lcd inverter or I would have tried replacing that first.
Solved! Go to Solution.
10-06-2014 12:00 PM
10-09-2014 04:49 PM
11-29-2014 06:59 PM
The actual problem was the motherboard. The replacement motherboard that I received was bad and also had the same problem with no LCD backlight. I replaced the motherboard with another one that I purchased and the laptop is working fine now.
01-28-2015 07:38 PM - last edited on 09-14-2015 01:02 AM by dragnoak
I had 2 helix that I dropped and on the second one I finally figured out why the screen didn't work anymore in both cases.
Obviously make sure the connectors are not damaged and try to reconnect them gently. The culprit however is the backlight fuse F1 which is right near the LVDS(main screen connector) on the motherboard. It probably trips when the connector comes out even slightly from the screen and touches the surrounding ground bar.
I temporarely bypassed mine with a thin thin wire until I order replacement fuses which are 2.5amp btw
Mod comment: Over sized picture converted to link. Please see About-Posting-Pictures-In-The-Forums