Lenovo flex 14 no display short, da0st6mb6e0 Rev :E

Previously when the laptop was turned on it responded and the power light came on but then turned off.

1. With lesson 7 it turns out to be short in PL8, PL4, PL3.
2. I checked the PL8 line, it turned out C291 was burnt.
then I took it off and tried to turn it on . it turned on with the fan spinning (maybe it was already booted) (with new ram ok, with old ram won't turn on).

The problem is PL4, PL3 are still short and now the LCD is just dark, there is no display. I tried disconnecting PL3 and PL4 but there was a short in VGPU_CORE.

How do I check the short section with lots of capacitors going to VGPU_CORE? And does capacitor C291 need to be replaced? or just let it go?

pl3/4
Resistance is 39 ohm
Voltage is 0.905 volt

Marking on GPU is N14m- GE-A2
Is it safe to leave c291, because I don't have changer for this capasitor.

Cn3:
1. 20.5v
8. 370 mV
9. 470 mV
28. 3.28 V
30. 0 V

After I check on schematic and board, U1 not present on board.

I tried with external HDMI monitor but nothing is displayed.
After waiting 3 hours the CPU fan is still on.
Pl3 and pl4 little bit warmer than other PL.
What else should I check?