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I've read this is due to some inverter connected to the screen cable. Has anyone replaced one? Can anyone confirm that is the reason a laptop screen would go black? When it goes black, I can put it to sleep and wake it again, and the normal screen comes back for a little while. Then the screen gets bright, then it goes black. And by black, I mean black, not dim. ( I know there has been discussion of various screen problems, including this problem in other threads, but I want answers to just the black screen problem. )
Thanks,
Tearose49

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A true-black screen that briefly returns after sleep is a common symptom of a backlight-related fault, but it is not the only cause. As described, the image can still be present even though the panel looks black — that detail helps narrow the fault to the display chain (backlight, inverter on CCFL systems, or the LVDS cable/panel) rather than the GPU or OS. Use the checklist below to isolate the problem before ordering parts.

  • Connect an external monitor. If the external shows a normal image, the GPU is likely fine and the fault is in the display assembly.
  • With the laptop on, shine a bright flashlight very close to the screen. If you can see a faint image, the LCD is working but the backlight is not. That points to an inverter (CCFL) or backlight lamp/LED failure.
  • Gently move the lid through its range while the display is active. Intermittent flicker or on/off that follows the hinge usually means a frayed LVDS cable at the hinge.
  • Try BIOS/POST view (before the OS loads). If the screen is black at POST too, that is hardware. If only black after Windows starts, check drivers and power/brightness settings.

If the backlight or inverter looks like the culprit, match the exact part number before buying a replacement. Older CCFL systems need an inverter; LED-backlit screens do not. Take anti-static precautions, avoid touching lamp tubes, and be aware CCFL inverters run high voltage. If you are unsure, reseating the display cable or asking a shop to inspect the hinge/cable is safer than repeated trial-and-error parts swaps. If a new inverter does not fix it, the lamp(s) or the panel itself (or a motherboard video output) may be at fault.

Member Avatar for tearose49

Yes it was the inverter. I found one very cheap on ebay, so I figured it was worth trying it. Figuring how to get to it on my HP tx2000 was a bit harder, but I found a demo on the web of someone changing the inverter on a Dell, and that method worked.
Tearose49

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