Re: Old LCD monitor backlight problems?
- --- In Electronics_101@yahoogroups.com, DaveC <davec2468@...> wrote:
>The major issue could be the color balance of the white LEDs. I'm not sure how they are doing now, but some have rather odd spectrums.
> >I have four LCD monitors with burnt out backlights waiting for LEDs.
> >Steve Greenfield AE7HD
> LEDs to be installed as replacements for the CCFL backlights? Or...?
> Details please!
A possible issue is that some LCD monitors have a "power good" signal from the fluorescent high V power supply, you just have to figure that out and wire it high or low, as appropriate.
Then fit a row of LEDs in where the fluorescent tubes were located, with appropriate current control.
BTW, so-called "LED" TVs are just LCD TVs that use LEDs for their backlight. Not to be confused with OLED TVs.
Steve Greenfield AE7HD
>The major issue could be the color balance of the white LEDs. I'mHave you measured the led spectrums? Or just the datasheets? I wonder
>not sure how they are doing now, but some have rather odd spectrums.
who is producing the ones for the TVs and monitors...
>Then fit a row of LEDs in where the fluorescent tubes were located,The laptop displays I've disassembled had one CCFL lamp at the bottom
>with appropriate current control.
>Steve Greenfield AE7HD
edge. Are desktop monitors the same? Or do they have a lamp at the
top edge as well?