Member Avatar for Zeno123

I have a tv I sometimes connect my laptop to for movies and such. It works well when I connect to the tv from a win 7 OS. When I switch to windows 8 however the tv does not recognize my laptop anymore. My laptop however does recognize the tv on windows 8. I can move icons of screen, move the mouse over to the tv, my control panel shows me the new display, everything seems fine. However, my tv does not recognize the vga input.

Any ideas what might cause the tv to not recognize the windwos 8 input? Especially seeing that windows 8 does recognize the tv. I'd think there's something wrong with the tv but then it works fine with windows 7 and vista inputs. It does not work with windows 8 so I'm thinking maybe there's some change I can make in win 8 that might help. Any help would be much appreciated.

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Brief expert summary: the laptop's Windows 8 stack is detecting the TV (icons and mouse move across, Control Panel shows a second display) but the TV itself refuses to lock on to the VGA signal. That pattern usually points to a timing/handshake mismatch — resolution, refresh rate or EDID information that the TV rejects — rather than a pure physical cable failure. This aligns with 's "versionitis" observation about different driver behavior between OSes.

Practical checklist to narrow it down and fix it:

  • Force a conservative resolution/refresh for the external display (1024x768 or 1280x720 at 60 Hz). Use Display Settings or the GPU control panel and apply the change to the external output only.
  • Switch the projection mode to "Duplicate" or "Second screen only" so the adapter/TV gets a single, stable signal for testing.
  • Try a different VGA cable or remove any active VGA-to-HDMI/adapter/docking device; those adapters sometimes present incorrect EDID and behave differently between drivers.
  • Put the TV's VGA input into "PC" or "RGB/PC" mode if available (many TVs treat VGA as a different source for video vs. computer input).
  • Update the laptop GPU driver to the vendor-supplied Windows 8 driver (or, if the problem started after a driver update, roll back to the older driver used under Windows 7).

Advanced notes and cautions: if conservative resolutions restore the picture, use the GPU vendor control panel to create a custom resolution with standard CVT/GTF timings that match the TV. EDID override or third-party utilities can help when the TV reports wrong capabilities, but those are advanced and should be used carefully. As pointed out, TV firmware can also affect EDID/handshake behavior — checking the manufacturer's support for firmware updates is reasonable, but firmware updates carry risk and should follow official instructions.

If tests show the laptop behaves the same with another monitor, the laptop/driver is the likely cause; if another Windows 8 machine also fails with the same TV and cable, the TV or adapter is suspect. Prefer a direct digital connection (HDMI) where possible; it usually avoids VGA timing issues.

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Member Avatar for rubberman

Versionitis? I think that Win7 and Win8 are using very different protocols to communicate with the TV, giving you the effects you are experiencing. Obviously, Win8 can understand the TV, but not vice-versa. I don't know if the TV has the ability to update to Win8 support remotely or not. If not, then you will be stuck using Win7 for now.

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