Lenovo Ideapad 5 15ITL05 without back ligth, Help

[luzvel64]

I have a Lenovo Ideapad 5 15ITL05 laptop. It turns on with a video signal on the screen but without lighting. I tried a new screen but it gave the same problem.

This computer uses the GS55J GS55K NM-D211 REV 1.0 2020-08-14 motherboard but I can't find a schematic, it also uses a r156nwf7 touch screen and I can't find where to test to verify if I'm missing any signal or voltage.

[mon2]

Re: Lenovo Ideapad 5 15ITL05 without back ligth, Help

Attached is the boardview file.

Boardview ---> https://www.badcaps.net/forum/showth...03#post1217003

[Pcgamer]

me podrias regalar el archivo por tambien estoy por retroiluminacion

[ktmmotocross]

Re: Lenovo Ideapad 5 15ITL05 without back ligth, Help

check pins 1,2,3,9 of edp conector for voltage

[luzvel64]

Re: Lenovo Ideapad 5 15ITL05 without back ligth, Help

Attached is the boardview file.

thank you very much, it is very helpful for me

[luzvel64]

Re: Lenovo Ideapad 5 15ITL05 without back ligth, Help

check pins 1,2,3,9 of edp conector for voltage

Thanks for your help, on pins 1, 2, 3 I have 0.4v on pin 9 I have 0v. I think the problem is the pwm signal. I'll keep checking, any advice is welcome.

[luzvel64]

Re: Lenovo Ideapad 5 15ITL05 without back ligth, Help

Hello, following the pwm signal, it seems to me that it comes from pch. I don't know what else I can do to verify because I don't have pwm

[ktmmotocross]

Re: Lenovo Ideapad 5 15ITL05 without back ligth, Help

as first u r missing backlight power on pins 1.2.3

[luzvel64]

Re: Lenovo Ideapad 5 15ITL05 without back ligth, Help

as first u r missing backlight power on pins 1.2.3

I have replaced the fuse fg3301 now I have 9V on pins 1 2 3 but still no backlight.

In RG3317 on the side where PCH_EDP_PWM comes I have a short to ground

[trepachka]

Re: Lenovo Ideapad 5 15ITL05 without back ligth, Help

Anyone has the schematics for this model? I already got boardview for it. Laptop appears to have liquid damage near the video cable, no backlight. Thanks.

[mon2]

Re: Lenovo Ideapad 5 15ITL05 without back ligth, Help

Do you have NMD211 on the logic board? Appears to be used for this model.

[trepachka]

Re: Lenovo Ideapad 5 15ITL05 without back ligth, Help

Mine says "GS557"

[mon2]

Re: Lenovo Ideapad 5 15ITL05 without back ligth, Help

Looks like this one?

US $325.00 | For Lenovo ideapad 5-15IIL05 laptop motherboard GS557 GS558 NM-C681 motherboard with CPU I5-1035G1 RAM 8G UMA 100% test send
https://a.aliexpress.com/_mrKVgJk

[trepachka]

Re: Lenovo Ideapad 5 15ITL05 without back ligth, Help

Yes, exactly like that one.

[mon2]

Re: Lenovo Ideapad 5 15ITL05 without back ligth, Help

See attached screen grab.

[trepachka]

Re: Lenovo Ideapad 5 15ITL05 without back ligth, Help

Thank you. I really appreciate it.

I responded to your original request for voltage measurements on PU601 in another thread for "Lenovo C740-15iml". Can you take a look at those and give me your opinion whether the chip has to be replaced or perhaps I need to take other measurements.

Thank you kindly.

[jimore]

Re: Lenovo Ideapad 5 15ITL05 without back ligth, Help

thank you. I really appreciate it.

I responded to your original request for voltage measurements on pu601 in another thread for "lenovo c740-15iml". Can you take a look at those and give me your opinion whether the chip has to be replaced or perhaps i need to take other measurements.

Thank you kindly.

bro i have same problem, how to pix

[Pcgamer]

tuve ese problema ya lo resolvi cambiando en fusible (fg3301) estaba abierto lo remplece por otro de otra board y me funciono midelo en continuidad y sabras si esta bueno o malo si esta bueno mide el pin 22 del circuito pu300 tiene que darte 8.9v si no cambialo espero te ayude

[LUIS0205764]

help i have the problem that +ledvdd only have 17v and i have no lighting on the screen, the fuse is fine, it is the same model of this laptop