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WTB: IBM Thinkpad 750C LCD Inverter

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Galacnor
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WTB: IBM Thinkpad 750C LCD Inverter

#1 Post by Galacnor » Wed Sep 09, 2020 10:20 pm

Hello all,

I recently received a Thinkpad 750C as a donation, I don't believe that it has been turned on for more than 20 years, and, as soon as the contrast and brightness controls were messed with, the screen started becoming intermittent, and now its just a plain off white grid. I have read on other discussions here that it is likely the Inverter, as the backlight is still clearly working, and I saw with my own eyes the LCD panel operating correctly.

Does anyone here have a spare inverter or whole screen assembly for a 750C? It would be greatly appreciated.

My regards
Alexander

hwattys
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Re: WTB: IBM Thinkpad 750C LCD Inverter

#2 Post by hwattys » Mon Sep 14, 2020 10:11 am

Can you send me a picture of the inverter? I have a "graveyard" of 750 and 360 displays with inverters (no good panels) and I likely have a couple of them so you would be pretty sure at least one is good.

Galacnor
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Re: WTB: IBM Thinkpad 750C LCD Inverter

#3 Post by Galacnor » Wed Sep 16, 2020 1:30 am

hwattys wrote:
Mon Sep 14, 2020 10:11 am
Can you send me a picture of the inverter? I have a "graveyard" of 750 and 360 displays with inverters (no good panels) and I likely have a couple of them so you would be pretty sure at least one is good.
Of Course!

Thanks for the help! Photo coming soon!
Alex

Galacnor
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Re: WTB: IBM Thinkpad 750C LCD Inverter

#4 Post by Galacnor » Mon Oct 19, 2020 3:04 am

hwattys wrote:
Mon Sep 14, 2020 10:11 am
Can you send me a picture of the inverter? I have a "graveyard" of 750 and 360 displays with inverters (no good panels) and I likely have a couple of them so you would be pretty sure at least one is good.
Hello again,

I'm so sorry for my late reply. There have been a couple really dirty projects going on in my workshop recently and I didn't want to risk damaging the thinkpad.

Heres my inverter

Image

Cheers
Alex

hwattys
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Re: WTB: IBM Thinkpad 750C LCD Inverter

#5 Post by hwattys » Mon Oct 19, 2020 9:43 am

I will search my graveyard for that. Might be a couple days since its Monday and I usually do stuff like this on weekends.

hwattys
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Re: WTB: IBM Thinkpad 750C LCD Inverter

#6 Post by hwattys » Fri Oct 23, 2020 2:46 pm

Checked my stock. I do not have an inverter like that but I do have a whole screen assembly from a monochrome 750. I know the screen is dead but I will crack it open and see if its the same. It does have brightness and contrast sliders like that.

kfzhu1229
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Re: WTB: IBM Thinkpad 750C LCD Inverter

#7 Post by kfzhu1229 » Fri Oct 23, 2020 5:44 pm

Well not sure if this helps but have you tried spraying anti-oxidation spray on the contrast and brightness knobs as well as the LCD connector? I believe it is called deoxit in the USA.
I have a Dell Latitude CP that works just fine initially but after a week or two the screen randomly started going out and display a fabric white pattern. I ended up taking the entire lid apart, only to find out that spraying such spray on the LCD connector fixed the issue. It seems like for that LCD and the inverter contacts are tin based and not the copper ones that we are used with seeing today, and those oxidise much more than gold plated copper ones. This is a 12.1" SVGA active matrix TFT panel though so not sure how much the passive matrix ones differ in places to fail.
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hwattys
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Re: WTB: IBM Thinkpad 750C LCD Inverter

#8 Post by hwattys » Mon Oct 26, 2020 8:56 am

750C monochrome inverter does not look like the picture so I do not have this inverter. Sorry.

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