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Just got a T400 with bad backlight

T400/410/420 and T500/510/520 series specific matters only
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Unknown_K
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Just got a T400 with bad backlight

#1 Post by Unknown_K » Fri Jan 20, 2017 7:16 am

I just got a T400 2676W1T unit with a backlight that goes out a few seconds after I turn it on. Unit works fine on external VGA. The inverter looks ok (nothing burned) but makes noise on startup and then goes quiet when the backlight goes out. I didn't notice any pink discoloration on the screen when it did work.

Could it just be the inverter (ordered one since they are cheap) or is the CCFL dead/dying?

Is it worth bothering to get a LED backlight screen assembly for this model? Changing backlight tubes is a pain.
Collection: 310ED, 350C, 360C, 365C, 365XD, 380D, 380XD, 380Z, 390E, 390X, 560X, 600, 600E, 701C, 750CS, 755C, 755CD, 760C, 760CD, 760ED, 760EL, 760XD, 760XL, 765L, 765D, 770, 770E, 770Z, T21, T22, T23, T30, A20P, A21P, A22M, A30, A31, A31P, T40, T42, T43P, T60, T61, R32, R40, R52, T400

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Re: Just got a T400 with bad backlight

#2 Post by RealBlackStuff » Fri Jan 20, 2017 7:34 am

That 2676W1T MTM points to an ancient R30.
Did you mean: 2767-W1T?

Sounds like a broken CCFL.
Starts up, CCFL heats up and the heat causes the CCFL-crack to widen, after which it switches off.
But if you're lucky, it could just be a bad inverter. Swap it and see.

To use a LED-screen you'll also need a LED-sub-board and a LED-LCD-cable.
Or swap the complete lid from a T400 or R400.
Lovely day for a Guinness! (the Real Black Stuff). And pigs CAN fly!

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Re: Just got a T400 with bad backlight

#3 Post by TonyJZX » Fri Jan 20, 2017 8:39 am

you need to find out exactly what screen model it is

then find out replacement costs

I'm sure you can upgrade a CCFL to an LCD.

I personally would not pay to replace an entire CCFL screen but I think you can just replace just the CCFL bulbs.

Unknown_K
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Re: Just got a T400 with bad backlight

#4 Post by Unknown_K » Fri Jan 20, 2017 8:50 am

Depending who made the screen, replacing bulbs can be a real pain in the rear.

Yes, I meant 2767W1T S/N L3-AHC3E 08/10 type 2767-CTO
Collection: 310ED, 350C, 360C, 365C, 365XD, 380D, 380XD, 380Z, 390E, 390X, 560X, 600, 600E, 701C, 750CS, 755C, 755CD, 760C, 760CD, 760ED, 760EL, 760XD, 760XL, 765L, 765D, 770, 770E, 770Z, T21, T22, T23, T30, A20P, A21P, A22M, A30, A31, A31P, T40, T42, T43P, T60, T61, R32, R40, R52, T400

Unknown_K
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Re: Just got a T400 with bad backlight

#5 Post by Unknown_K » Mon Jan 23, 2017 3:37 am

I ordered a new inverter and a new bulb, if I can't get the screen fixed I will order a new one.
Collection: 310ED, 350C, 360C, 365C, 365XD, 380D, 380XD, 380Z, 390E, 390X, 560X, 600, 600E, 701C, 750CS, 755C, 755CD, 760C, 760CD, 760ED, 760EL, 760XD, 760XL, 765L, 765D, 770, 770E, 770Z, T21, T22, T23, T30, A20P, A21P, A22M, A30, A31, A31P, T40, T42, T43P, T60, T61, R32, R40, R52, T400

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Re: Just got a T400 with bad backlight

#6 Post by jaspen-meyer » Tue Jan 24, 2017 4:44 am

I'd get a used machine with an LED screen. You get the screen, and a parts machine.
T420 i7 3612QM seabios; T420 i7 3630QM; T400 Q9100 seabios; T61 P9600; T60 libreboot; x62; x60s libreboot, led; x24 xiphmont led

Unknown_K
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Re: Just got a T400 with bad backlight

#7 Post by Unknown_K » Tue Jan 24, 2017 9:58 am

I have $20 into this machine, add another $15 for the inverter and bulb. I purchased the tube mostly because if you collect old Thinkpads you eventually will need to get good at CCFL replacements. If/when I can't get it working a new screen will be the next move.
Collection: 310ED, 350C, 360C, 365C, 365XD, 380D, 380XD, 380Z, 390E, 390X, 560X, 600, 600E, 701C, 750CS, 755C, 755CD, 760C, 760CD, 760ED, 760EL, 760XD, 760XL, 765L, 765D, 770, 770E, 770Z, T21, T22, T23, T30, A20P, A21P, A22M, A30, A31, A31P, T40, T42, T43P, T60, T61, R32, R40, R52, T400

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Re: Just got a T400 with bad backlight

#8 Post by jaspen-meyer » Tue Jan 24, 2017 10:39 am

Unknown_K wrote:if you collect old Thinkpads you eventually will need to get good at CCFL replacements.
I replace CCFL backlights with LED backlights.
T420 i7 3612QM seabios; T420 i7 3630QM; T400 Q9100 seabios; T61 P9600; T60 libreboot; x62; x60s libreboot, led; x24 xiphmont led

Unknown_K
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Re: Just got a T400 with bad backlight

#9 Post by Unknown_K » Wed Jan 25, 2017 3:04 pm

Well the inverter came in before the bulb so I installed it. Seems to work ok (backlight has yet to shutoff after 45 minutes) but the inverter seems to get pretty warm (not making noise like the other one did).
Collection: 310ED, 350C, 360C, 365C, 365XD, 380D, 380XD, 380Z, 390E, 390X, 560X, 600, 600E, 701C, 750CS, 755C, 755CD, 760C, 760CD, 760ED, 760EL, 760XD, 760XL, 765L, 765D, 770, 770E, 770Z, T21, T22, T23, T30, A20P, A21P, A22M, A30, A31, A31P, T40, T42, T43P, T60, T61, R32, R40, R52, T400

Unknown_K
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Re: Just got a T400 with bad backlight

#10 Post by Unknown_K » Wed Jan 25, 2017 3:26 pm

Nevermind the BL went out again after the inverter cooled off. I assume the tube was drawing more power then normal and needs replaced.
Collection: 310ED, 350C, 360C, 365C, 365XD, 380D, 380XD, 380Z, 390E, 390X, 560X, 600, 600E, 701C, 750CS, 755C, 755CD, 760C, 760CD, 760ED, 760EL, 760XD, 760XL, 765L, 765D, 770, 770E, 770Z, T21, T22, T23, T30, A20P, A21P, A22M, A30, A31, A31P, T40, T42, T43P, T60, T61, R32, R40, R52, T400

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