I am having a problem with my Toshiba M35x-s329 video and the DC plug issue you discuss on here.
My screen recently went blank during a shutdown without apparent cause. Here are all the things I have done to try to remedy this problem:
1) After reading about the loose DC plug issues on here. I decided to buy a NEW system board. The new board has a better DC connector – so obviously the manufacturer has addressed this issue. I was going to build a second laptop from the parts.
2) My screen still is blank (or barely able to see) – I have attempted to plug in an external monitor and I see the windows splash screen on the monitor but not the laptop screen – and then after that NOTHING.
3) I ordered a NEW inverter and replaced that as well…and STILL have the same thing happening. I have tried booting to safe mode – doing a boot from a CD (i.e. windows XP) and also from the Toshiba Recovery CD…the screen never gets more than DIM – I CAN see the splash screen BARELY…so there is some power getting to the screen.
I am at my wits end here. I have spent $400 already on parts and my laptop is still not working. Can you offer some suggestions other than a NEW screen or CCFL (which I don’t know how to repair)?
It looks like the system board works fine because you can get a video output on the external monitor. Most likely you cannot boot to the desktop on the external monitor because it switches back to the internal video after the Windows splash screen. Try to press Fn+F5 combination to switch the video to the external monitor. If the system board is fine and the operating system works fine, you should be able to use the laptop with the external monitor.
You suspected the FL inverter board and you were absolutely correct. I think in most cases a new FL inverter would resolve the problem with dim video.
Here is what I think. It is very unlikely that 2 different system boards have the same problem, so I wouldn’t suspect the system board. You’ve replaced the FL inverter board but it didn’t fix the problem. I think there is a possibility that the FL inverter board you’ve purchased is bad, not likely but possible. There are 2 more parts related to the backlight – the video cable and the LCD screen itself (the CCFL inside the screen). It is possible that the video cable is defective and doesn’t provide any power to the inverter board. In this model the video cable has 2 different channels. First channel – the cable that connects to the left side of the inverter – is responsible for providing the power to the FL inverter board and the second channel – flat cable that connects to the back of the LCD – is responsible for providing actual data to the screen. If the first channel is bad (or the inverter is bad) the backlight will not work, but you still would be able to see a faint image on the screen. It is just my guess that the video cable could be the culprit.
And finally, the LCD screen itself. I know that some people can replace the backlight bulb and get the screen back to a normal condition. We usually replace the entire screen because the backlight bulb is very fragile. I assume that you can find a company that replaces the laptop screen backlight if you search on the internet.