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Backlight/LCD/cable/inverter replacement on a T21?

T20-T23 Series and T30 specific matters only. NOT for T25-Retro.
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ragefury32
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Backlight/LCD/cable/inverter replacement on a T21?

#1 Post by ragefury32 » Wed Oct 16, 2019 11:17 am

Folks:

I am running into an issue with a Thinkpad T21 (2647-5BU) where the LCD will have a pink/mauve screen, and if I press down on the region where the LCD connects to the motherboard, the pink will disappear and be replaced by complete darkness. It will previously boot up with a pink hue, then the LCD will look fine afterwards. External VGA display shows no issues (so the GPU is fine).

Anything I should check first before I order parts to repair/replace? I am suspecting a worn backlight on the panel (46L2493/95?), then maybe a bad octopus cable (27L0590) then perhaps a bad inverter (10L1402). Has anyone replaced a backlight/CCFL on the panels in question?
X31 (2672-C2U)
X41 Tablet (1869-CSU)
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onespeedbiker
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Re: Backlight/LCD/cable/inverter replacement on a T21?

#2 Post by onespeedbiker » Mon Nov 11, 2019 1:10 am

When you say "if I press down on the region where the LCD connects to the motherboard" do you mean pressing on the wire harness where it plugs into the motherboard? If so it's likely an issue with the wiring harness.

RealBlackStuff
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Re: Backlight/LCD/cable/inverter replacement on a T21?

#3 Post by RealBlackStuff » Mon Nov 11, 2019 3:13 am

Nah, "pink booting" is a sure sign of a dying CCFL.
Some people have managed to replace a T2x CCFL, but more often than not it failed.
Best thing would be to replace the LCD.
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kyle2000yt
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Re: Backlight/LCD/cable/inverter replacement on a T21?

#4 Post by kyle2000yt » Fri Jan 24, 2020 3:37 pm

RealBlackStuff wrote:
Mon Nov 11, 2019 3:13 am
Nah, "pink booting" is a sure sign of a dying CCFL.
Some people have managed to replace a T2x CCFL, but more often than not it failed.
Best thing would be to replace the LCD.
Sort of off-topic, but do you know if it's possible to replace an 14.1" XGA LCD panel/cable in a T21 with an SXGA+ one? The cables are different but will the LCD panel fit and the LVDS cable connect properly on the motherboard? I already tried putting the LP141E2-A1M1 panel in, it doesn't work (inverter cable is too long). I'm going to try the LP141E2-A1.

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Re: Backlight/LCD/cable/inverter replacement on a T21?

#5 Post by RealBlackStuff » Sat Jan 25, 2020 3:09 am

Yes, you can.
And if any cable is too long, just fold it.
Both XGA and SXGA+ use the same inverter.
Lovely day for a Guinness! (the Real Black Stuff). And pigs CAN fly!
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Re: Backlight/LCD/cable/inverter replacement on a T21?

#6 Post by kyle2000yt » Sat Jan 25, 2020 10:50 pm

RealBlackStuff wrote:
Sat Jan 25, 2020 3:09 am
Yes, you can.
And if any cable is too long, just fold it.
Both XGA and SXGA+ use the same inverter.
Do you know if the SXGA+ panels use a longer inverter cable? (the pink and white connectors). They shouldn't because they are both 14 inch panels.

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Re: Backlight/LCD/cable/inverter replacement on a T21?

#7 Post by RealBlackStuff » Sun Jan 26, 2020 3:41 am

Like I said before:
RealBlackStuff wrote:
Sat Jan 25, 2020 3:09 am
Both XGA and SXGA+ use the same inverter.
Lovely day for a Guinness! (the Real Black Stuff). And pigs CAN fly!
Check out The Boardroom for Parts, Mods and Other Services.

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kyle2000yt
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Re: Backlight/LCD/cable/inverter replacement on a T21?

#8 Post by kyle2000yt » Sun Jan 26, 2020 9:25 am

RealBlackStuff wrote:
Sun Jan 26, 2020 3:41 am
Like I said before:
RealBlackStuff wrote:
Sat Jan 25, 2020 3:09 am
Both XGA and SXGA+ use the same inverter.
I know, but there's a connector that comes out of the LCD (a pink and white cable), and you can't remove it from the LCD. On an SXGA+ panel I tried to install, the cable is much longer than the XGA and doesn't fit properly. As far as I know, it's impossible to remove this cable.

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Re: Backlight/LCD/cable/inverter replacement on a T21?

#9 Post by RealBlackStuff » Sun Jan 26, 2020 10:49 am

The LCD pink/white cable can only be put in in one way, but it's length is totally irrelevant.
Just fold/bend it any which way, as long as everything can fit in the lid. without pressure on any wire(s).
Where it goes has no influence whatsoever, assuming it's a functioning LCD.
Lovely day for a Guinness! (the Real Black Stuff). And pigs CAN fly!
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ragefury32
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Re: Backlight/LCD/cable/inverter replacement on a T21?

#10 Post by ragefury32 » Sun Feb 16, 2020 10:23 pm

RealBlackStuff wrote:
Mon Nov 11, 2019 3:13 am
Nah, "pink booting" is a sure sign of a dying CCFL.
Some people have managed to replace a T2x CCFL, but more often than not it failed.
Best thing would be to replace the LCD.
Yeah, I figured as much - the CCFL replacement requires an LCD disassembly that is frankly, risky and not easy to pull off. The LCD is still pink until it warms up, but until it dies completely I don't plan to replace it.

Turns out the original "If I press on this the screen goes black" was me forgetting to put the screw on the wiring harness back on (grounding point).
X31 (2672-C2U)
X41 Tablet (1869-CSU)
Thinkpad X1 Carbon Gen 6 (20KH)

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