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But it was exactly the same after liquid damage, before i messed up with it. Is it worth trying to check it? maybe cpu is not dead after all? any specific ways to check cpu?

ok so changed u7310,and it PPVIN_S5_HS_COMPUTING_ISNS=12.5V. Board switches on with keyboard bypass(holding pwr button/removing charger,attaching charger again /reease button and press again) PP5V-s0 present, PP3V3_S0 present but no chime and no video as it was before. Gonna check power rails...

ok quick update. I have managed to turn the board on with holding power button on-removing charger while holding button-and plugging charger back in while holding button still and it turned on. so fans started to spin but no chime or video. i was measuring around u7310 as there was no power from...

Diode mode PP3v3_S5 = 131 .should be more i guess right?

no red probes either.

Looks pretty clean no obvious liquid damage.

HI MATE, PPBUS_G3HOT =12.56V ​​​​​​SMC_PM_G2_EN=3.38V PP5v_S5=5V PPVRTC_G3H=3.3V ​​​​​​​

PP3V3_S5=0V also missing when P3V3S5_EN=3.3V. Change u7501?

Hi guys, working on 820-3662A logic board. Green orange light is on when charger plugged in but no power. PP5V_S4 missing. Checked P5VS4_EN and its missing. It comes from u8170 S4_PWR_en where pin 2- PM_SLP_S5_L is 0V. A little bit strange as P5VS4_EN= 0.07V but S4 PWR EN= 0V. Where does the...

hi mate, i used my tv. connected with mini display port to hdmi cable to motherboard

i have tested the screen on the another laptop it works fine. i have checked on external screen no video as well. originally it was water damaged. had 3 boards and all with the similar symptoms. what can possibly cause this? everything seems to work just LCD_pwr_en missing and i guess thats why...

or anyone else?

any suggestions duke?

ok so i have tried to swap bios but no luck,still the same thing. i have managed to reset pram now but it didnt help either. it starts chimes but no video. all power seems to be there keyboard works. checked lvds ddc mux and LVDS_DDC_SEL_IG missing 0V. measured R9682-0V. Other required pulldowns...

ok so the board turns on fans spin but no chime no video. if i measure voltage on PPCPUVTT_S0 when board is powered on i get 1.05V so its fine, then when i measure PPVCORE_S0_CPU i get 0.8V and its supposed to be 1.25V right? does it mean it is shorting somewhere? most of the time when i plug...

hi mate, where are you from duke? you're always here. glad you're always happy to help. yes mate EG_RAIL3_EN is present. vcore GPU was shorted so removed the L8920, still nothing, replaced u8900. i have 4.6V on Q8951 pin5 lgate, 0 V on Q8950 pin4 ugate, pins 1256 -8.6V

Hi, found some time to play with the board again. sorted out the short on PP5V_S0, it was a poly tantalum capacitor. Now the board turns on, but PPVCORE_GPU Missing. Power comes to U8900 anything particular to look at ?

find out that something at PP1V05_S0_PCH end shorted to ground as two L2560 and L2565 had a crack. removed them and both pins 1 had a continuous beep 0.05 diode mode. Trying to find out what makes PP1V05_S0_PCH but cant find it. any suggestions.

PP5V_S0 diode mode = 433

Hi need some advice, board 820-2849 PP5V_S0 acting strange. need to find out where its shorted to ground. If i take RC215 off then pin 2 shows beautiful 5.02V and pin 1=2.27v , what i dont understand where does it take 2.27v when rc215 is off as UC240 is no stuff. As soon as i put it on 5V...