Dell Precision 3551: Why is my LCD backight not turning on, exactly?

Thu, 13 Aug 2026 13:17:44 -0700

I have a Dell Precision 3551 laptop (ST: 18RS4D3; 8FC8 Suffix). A while ago, I plugged in a display assembly of a Precision 3530 computer into the 3551, because the LCD of the 3551 was cracked, and I wanted to see if the screen of the 3530 assembly would turn on... Of course it didn't (before that, the cracked LCD had its backlight working, with many colors of a broken screen, but when I re-installed the cracked LCD, no backlight appeared, so something felt off). So now, months later I recently got a LCD replacement, put the bare LCD in the assembly, connected the 30-pin EDP cable into it, and put back the assembly onto the 3551. It took like 10 seconds, and the (Dell) logo appeared, but faint and dim. I could enter the BIOS, but when I try to boot into Linux Mint, after the OS is done loading, its just a black screen with the laptop on. I don't hear the log in sound when I try to enter the password. As of now, I'm guessing its a backlight fuse that tripped. I really don't know what's exactly going on here though...

Front

EDP Area

Board Info

Back

FZ2 blown, FZ3 ok, the other [H] is also blown. I have confirmed this with continuity mode.

⟐ Commented Ağustos 13, 2026 at 13:17 GMT-7

Dell Precision 3551: My screen is cracked

Sat, 22 Feb 2025 19:00:34 -0700

The screen is cracked and has white lines going horizontally across the screen. The laptop works just like it usually would.

⟐ Answered Şubat 22, 2025 at 19:00 GMT-7

iFixit - Answers With Device "Dell Precision 3551"

Dell Precision 3551: Why is my LCD backight not turning on, exactly?

Dell Precision 3551: My screen is cracked