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t540p new lcd panel not working

T430-T490, T530-T590 Series
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Siurczek
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Location: Tarnowskie Gory, Poland

t540p new lcd panel not working

#1 Post by Siurczek » Wed Sep 28, 2022 8:14 am

Hello.
I have t540p with broken hd tn lcd panel with is working but its smashed so I decided to upgrade to fhd ips and bought new panel (LP156WF6-SPK6) and it appears it doesn't work it just blinks very lightly cauple times at the start and thats it (and its second fhd panel that I tried that does that).
Am I missing something?
Edit: title
Last edited by Siurczek on Wed Sep 28, 2022 12:41 pm, edited 2 times in total.

RealBlackStuff
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Re: t550p new lcd panel not working

#2 Post by RealBlackStuff » Wed Sep 28, 2022 9:18 am

Can you see anything at all, even just a few things, when you shine a flashlight on the screen?
Did you remove power and batteries before the screenswap?
If not, you may have blown the backlight fuse, located near the LCD-connector on the motherboard.
Solder a new one on top of the old one (3A/32V/fast).
Lovely day for a Guinness! (The Real Black Stuff)
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Siurczek
Posts: 6
Joined: Sat Jan 29, 2022 11:32 am
Location: Tarnowskie Gory, Poland

Re: t540p new lcd panel not working

#3 Post by Siurczek » Wed Sep 28, 2022 12:41 pm

RealBlackStuff wrote:
Wed Sep 28, 2022 9:18 am
you may have blown the backlight fuse
well if I connect old screen everything is fine so I think fuse is ok. I should mention earlier that I see those flashes/blinks when I shine on new panel with flashlight

axur-delmeria
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Re: t540p new lcd panel not working

#4 Post by axur-delmeria » Thu Sep 29, 2022 10:41 pm

Based on the T540p FRU list https://download.lenovo.com/parts/Think ... 131107.pdf, there are 3 LCD cables available:

04X5539 FRU EDP Cable ASM Wedge
04X5540 FRU EDP Cable ASM (Flat / FHD)
04X5541 FRU EDP Cable ASM (Flat / FHD++)

You may need 04X5540.
Daily driver: X220 4291-C91 i7-2620M

Backup: X601 Core 2 Duo T8100
Toy: X60F Core Solo U1300
On loan: X220 4291-P79 i5-2520M
In pieces: two retired but working X61Ts
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Siurczek
Posts: 6
Joined: Sat Jan 29, 2022 11:32 am
Location: Tarnowskie Gory, Poland

Re: t540p new lcd panel not working

#5 Post by Siurczek » Sun Oct 09, 2022 2:45 pm

yes it was the cable. Everything is working now

axur-delmeria
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Re: t540p new lcd panel not working

#6 Post by axur-delmeria » Sun Oct 09, 2022 11:33 pm

Glad it worked. :)
Daily driver: X220 4291-C91 i7-2620M

Backup: X601 Core 2 Duo T8100
Toy: X60F Core Solo U1300
On loan: X220 4291-P79 i5-2520M
In pieces: two retired but working X61Ts
RIP: 760XD 9546-U9E; X61 7676-A24; and a BOE-Hydis HV121P01-100 in failed SXGA+ mod
:cry:

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