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I have changed u7701 , still backlight is not staying … I don’t have a working lcd to test… is there a way I can make sure the current lcd is good?

Image is present, O/P voltage is very inconsistent (I mean fluctuating between 25 and 8.5V) Indeed the backlight also fluctuates, It's not staying a long time for more than 25V.

Is there a way we can identify looking at the pictures which cable is bad on the display assembly? Sometimes I get the usual backlight cable damage, Physically visible, Then I normally change the cable (I mean patch another cable with the existing cable). Sometimes I don't see any physical...

Can I know the commands for disabling it please?

Changed the connector, seems like that sleep issue solved ..... Just gone through hw diagnostic test .... Got NDT001 - Issue with the thunder bolt Hardware... Never ending problems😣

Will, it makes sense re soldering the display connecter ? Does SMC_LID control sleep activity?

Both the boards I have tried are 3476, Still not sure the display belongs to which model.. How can we identify it from a display?

Is there a way I can make sure of the compatibility It was A1502 2013? The replacement tried was from 2014. The only possibility is whether the display is a 2015 model or not... I don't have a 2015 model laptop for testing. No image , No backlight

Didn't try known bios, CleanME doesn't help. No Liquid sign...

I have strongly believed it's a problem with lvds cable, I have changed the cable ..oooopzzz... NO luck. Checked with a good known LCD - Yes its working. What would be wrong with this LCD ?

Did I answer your question? :rolleyes:

This SATA to USB cable has two LED's they blinks only when its booting , At weird mode they are not blinking but just glowing

Connected an external SSD ---> Removed the internal SSD ---> System booted properly, But after 3rd restart, it again went to that weird mode (Fan running not booting)----> Measured PPVCC_S0_CPU at weird mode= 1.808V

Checked after removing the board PLT_RESET_L is high 3.3V,,,,,

Seems like back light issue solved... Now when I press the power button sometimes it boots, sometimes it doesn't boot or no chime sound just Fan is rotating continues, Tried pram reset and Cleanme... Doesnt help

I have resoldered properly... Now the backlight is working ..... Only one issue... There is 16 different brightness control by pressing the F1 and F2 key (Low to High), Only on the 15th position of brightness does it's flickering. I mean brightness doesn't stay stable. It's slightly flickering.

Ahhh Ok ., Got it,,,,, Sad let's close the thread

I mean , Can we replace the eDp bus with DP_DDI? What I understood DP_DDI is also display signals but not for internal display but for external. They multiplux and give for four USBC connectors. My question is , Can these signals drive internal display?

Changing them doesn't help ☹️

I agree, Should I try feeding (display mux) inputs directly to display? for example U3610. If you say it's not possible sad let's close the issue here