Page 2 of 3

Re: Display problem X220i Tablet

Posted: Mon Apr 09, 2018 4:28 pm
by Thinkpad4by3
I can second imgur.

Re: Display problem X220i Tablet

Posted: Mon Apr 09, 2018 5:44 pm
by brucehe
Let me know if this works.

https://imgur.com/oT5Tmwc

Bruce

Re: Display problem X220i Tablet

Posted: Mon Apr 09, 2018 6:45 pm
by Thinkpad4by3
The components looks fine but it looks like something was spilled in that systemboard. I don't know for sure, wait for RBS to give you a final verdict.

Re: Display problem X220i Tablet

Posted: Mon Apr 09, 2018 9:06 pm
by RealBlackStuff
You need a multimeter to check fuses F4 (4th vertical left of printed F4, blue, with letter F) and F3 (blue, immediately horizontal left of white connector, blue, with letter H).
Check them for "continuity" (= beep) with all power removed.

Re: Display problem X220i Tablet

Posted: Mon Apr 09, 2018 11:53 pm
by brucehe
Looks like both fuses are good. The sticky looking stuff on the board is the adhesive from the black plastic covering I removed to access the components.

Bruce

Re: Display problem X220i Tablet

Posted: Tue Apr 10, 2018 10:25 am
by brucehe
Sort of back to where I started. Just not convinced it is a system board issue. There is a entire display for $50 on Ebay which is a good price for one of these. Just not sure how much I want to invest in this unit.

Bruce

Re: Display problem X220i Tablet

Posted: Tue Apr 10, 2018 10:37 am
by Thinkpad4by3
Well those X220T units with an i5 can run a near 200$. 70$ for an i3 X220T would still put you 80$ ahead. Another 70$ can get you a i7 board and make you 110$ ahead.

Re: Display problem X220i Tablet

Posted: Wed Apr 11, 2018 7:06 pm
by brucehe
I purchased an I5 system board as that was the cheaper path. Will let you know if that was the issue. Meanwhile I will keep looking for a nice display.

Bruce

Re: Display problem X220i Tablet

Posted: Wed Apr 11, 2018 7:11 pm
by Thinkpad4by3
Well you just increased the value of the machine about 50$ but I dont know how much you spent on the i5 mainboard for if you lost or gained value.

Re: Display problem X220i Tablet

Posted: Mon Apr 16, 2018 6:11 am
by marlinspike
I saw fuse f3 and f4 mentioned, but isn't f1 also involved?

Re: Display problem X220i Tablet

Posted: Mon Apr 16, 2018 11:39 am
by brucehe
I changed the board and no display. Connected the display port to an external monitor and there was output when the LCD cable was not connected. I connected the LCD and this time I had my headlamp shining at the display and there was output but no backlight. I had not seen this before. Maybe I missed it or there was a problem with the original board. I will put the old board back in and check.

I now know there is a backlight problem. Does the backlight go out on these LED panels or is it blowing fuses on the board? F3 and F4 were good on the original board. I will check the fuses on the new board including F1.

Bruce

Re: Display problem X220i Tablet

Posted: Mon Apr 16, 2018 12:36 pm
by marlinspike
Check F1. While I haven't taken mine apart yet I saw on another forum that I can't find at the moment that F1 was the problem.

Re: Display problem X220i Tablet

Posted: Mon Apr 16, 2018 2:52 pm
by brucehe
Can't seem to find F1, every other fuse though... might be on the back side.

Bruce

Re: Display problem X220i Tablet

Posted: Mon Apr 16, 2018 3:58 pm
by brucehe
OK, found it, new information.

F1 on the new board is blown. I can't see the display in the background anymore either. I also checked F1 on the old board and it is fine.

Can the fuse be replaced or shorted?

Bruce

Re: Display problem X220i Tablet

Posted: Mon Apr 16, 2018 4:06 pm
by marlinspike
brucehe wrote:
Mon Apr 16, 2018 3:58 pm
OK, found it, new information.

F1 on the new board is blown. I can't see the display in the background anymore either. I also checked F1 on the old board and it is fine.

Can the fuse be replaced or shorted?

Bruce
Shorting of course works and of course is not recommended. Yes, it can be replaced. Where is F1, so I know where to look when I get back home and can take mine apart?

Re: Display problem X220i Tablet

Posted: Mon Apr 16, 2018 4:14 pm
by RealBlackStuff
X220 and X220t have almost identical schematics, for D/L see here: https://forum.thinkpads.com/viewtopic.php?t=121522
Fuse locations should also be almost identical.

Re: Display problem X220i Tablet

Posted: Mon Apr 16, 2018 11:26 pm
by brucehe
F1 is on the side with the heat pipes and RAM and is to the left of the docking port. It is 3A 32V. I think I heard it blow but maybe it was my imagination. It sounded like a static charge jump. Could that have been the fuse?

Anyway, where is the best place to get a new one? How difficult is it to replace this surface mount component?

Bruce

Re: Display problem X220i Tablet

Posted: Tue Apr 17, 2018 6:20 am
by RealBlackStuff
If you're talking fuses, I usually get mine from http://www.newark.com/ but there are also others such as https://www.digikey.com/ and https://www.mouser.com/
If you are handy with a soldering iron and tiny SMD fuses, you can either replace them, or solder a new one piggyback style on top of the old one.

Re: Display problem X220i Tablet

Posted: Tue Apr 17, 2018 11:08 am
by brucehe
Thanks, I like the idea of piggybacking one on top.

I looked at Mouser's document on SMD fuses and there are many types. How do you find out the specifications of the fuse, very fast versus slow blow, etc?

I notice there is a "P" on the fuse.

Thanks again all,

Bruce

Re: Display problem X220i Tablet

Posted: Tue Apr 17, 2018 11:17 am
by brucehe
Update: I put the old board back in and hooked up the display and yes I could see the image on the screen in the background i.e. no backlight. This board has all good fuses so I am assuming this has been a LCD problem all along even though I read it is rare to have a LED backlight failure.

I have read about ways to test the LED backlight but with this composite panel of digitizer and LCD opening it up I am guessing would be difficult and even if I verified the LED backlight was bad I am not sure it is repairable except by replacing the LCD.

So, I think I am back to looking for a whole lid or display. Unfortunately they are not too common on Ebay.

Meanwhile I will see if I can repair the board with the blown fuse which I am guessing I damaged not being careful in my anit-static procedures, lesson learned.

Bruce

Re: Display problem X220i Tablet

Posted: Tue Apr 17, 2018 11:28 am
by RealBlackStuff
The schematics have either the exact fuse-name near it or its value, check page 32.
Usually they are fast-acting size 0603: https://www.fusesunlimited.com/products ... ntfuse0603
Amp Letter

Code: Select all

0.25	D
0.375	E
0.5	F
0.75	G
1	H
1.25	J
1.5	K
1.75	L
2	N
2.5	O
3	P
3.5	R
4	S
5	T
7	W
8	X

Re: Display problem X220i Tablet

Posted: Fri Apr 27, 2018 11:37 am
by brucehe
I purchased a new fuse from Ebay and my neighbor who has all the nice electronic tools, heated soldering tweezers and adjustable temperature iron replaced the fuse. I reinstalled this I5 board and it works fine to the display port but I do not see anything on the LCD whereas when I install the I3 board I can see very dim images on the display. The backlight is obviously not working. I have checked all 20+ fuses on both boards.

My next step is to purchase a used display when I see one on Ebay that is not too scratched. Any other ideas appreciated.

Thanks,

Bruce

Re: Display problem X220i Tablet

Posted: Fri Apr 27, 2018 12:38 pm
by Thinkpad4by3
Take apart the LCD.
Remove the backlight and diffuser
Replace it with a mirror.
Now you have a reflective display that will rock in the sun!

Re: Display problem X220i Tablet

Posted: Sat May 05, 2018 1:30 am
by brucehe
The saga continues....

Got a used supposedly good display from Ebay. Basically does the same thing the original display does. I get a dim image on the background (typical no backlight image) with the I3 board and nothing at all with the I5 board.

I must be missing something obvious else I have two bad boards. I notice there is a switch to indicate the presence of a stylus. Does this need to be in place to make the display light?

I am going to go to the schematic and verify which fuses are involved in the LCD backlight and check them on the board.

Thanks,

Bruce

Re: Display problem X220i Tablet

Posted: Sat May 05, 2018 5:13 am
by RealBlackStuff
Did you get just the LCD or a complete lid?
Have you ever checked/replaced the LCD-cable?

Re: Display problem X220i Tablet

Posted: Sat May 05, 2018 10:14 am
by brucehe
I got the whole lid. Yes, I did get a new LCD cable.

Bruce

Re: Display problem X220i Tablet

Posted: Sat May 05, 2018 10:23 am
by Thinkpad4by3
Have you tried using the keyboard to try and raise the brightness on the i3 board.

Re: Display problem X220i Tablet

Posted: Sat May 05, 2018 6:31 pm
by brucehe
Yes, no change and hitting F6 and F7.

Bruce

Re: Display problem X220i Tablet

Posted: Sat May 05, 2018 8:07 pm
by Thinkpad4by3
On the X220 is should be Home and end to change the brightness, right next to PgUp for the thinklight.

Re: Display problem X220i Tablet

Posted: Sun May 06, 2018 12:47 am
by brucehe
Those are the keys I used to adjust the brightness, no effect.

Bruce