salam aleykum
i have tried to change the screen and the nap too but no change
the screen affiche but without light
thanks

Shalom.
Now try to replace the voltage inverter for the backlite lamps.

there is no inverter , led screen

Pardon me.
Check +LEDVDD, LVDS_PWM, BKOFF# signals at JLVDS1.

LEDVDD 19V
LVDS_PWM 0V
BKOFF# 3V

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Posted after 13 minutes 5 seconds:
LVDS_PWM 0V IS IT NORMAL ?

I think not. Check the resistance between this pin and GND.

RESISTANCE BETWEEN PIN23 AND GND 4.8 kΩ

Check the LID switch output LID_SW# at U5.

3.35V
3.37V

All signals look ok, except LVDS_PWM. Also check +LCDVDD_L.
Also you can check LVDS_PWM signal directly at 25 pin of U6.
If there is no signal too, you can try to simulate it: remove R111 and R112 and connect LVDS_PWM to +3VS with 1K resistor.
Надеюсь, дым ниоткуда не пойдет. К утру следующего дня подтянутся гуру и решат проблему в два счета, а то я не Кашпировский, чтобы на расстоянии уровни мерять.

извините, но я не мог найти двух сопротивления R111 и R112

Disconnect pin 26 of JLVDS1 from PCB and solder 1 kom resistor directly to it.