Hi. All the time I found answers in the google, but this time I can't find anything. I have macbook pro logic board 820-3115-b. The problem with this board is: Fan spin in full speed, no image no chime. Have troubleshooted all rails is pressend except no voltage on PPVCORE_S0_AXG_R. Have replaced U7400 three times plus mosfet at the same time, replased SMC. No idea what can be wrong with this board.
U7400
Pin 13; 1.42V
Pin 45; 5.04V
Pin 4; 0.05V
Pin 24; 3.3V
pin 12; CPUIMVP_AXG_PGOOD voltage 0.19V,
pin 13; CPUIMVP_AXG_PWM2 0.72V,
pin 24; CPUIMVP_PGOOD 3.3V.
Pin 47; 3.3V
Pins ;21;23;22; 1.05V,
Pin 39; 4.3V;
Pin 40; 4.45V;
Pin 38; 0.0V;
Pin 35; 2.05V;
Pin 36; 1.94V
Pin 8; 0.0V
Pin 6; 1.12V
Pin 10; 9; 0.0V
Pin 11; 5.04V
Pin 18; 15; 16 0.0V
Pin 14; 4.78V
Pin 31; 4.58V
Pin 33; 1.11V
Pin 32; 1.54V
Pin 34; 6.16V
Pin 44; 1.12V
Pin 3; 1.12V
Pin 43; 1.12V
Pin 41; 1.12V
Pin 42; 1.12V
Pin 28; 4.57V
Pin 26; 1.11V
Pin 27; 1.53V
Pin 25; 6.15V
Pin 48; 0.57V
Pin 1; 0.47V
Pins 19; 29; 5.09V
Pin 46; 5.04V
U7400
Pin 13; 1.42V
Pin 45; 5.04V
Pin 4; 0.05V
Pin 24; 3.3V
pin 12; CPUIMVP_AXG_PGOOD voltage 0.19V,
pin 13; CPUIMVP_AXG_PWM2 0.72V,
pin 24; CPUIMVP_PGOOD 3.3V.
Pin 47; 3.3V
Pins ;21;23;22; 1.05V,
Pin 39; 4.3V;
Pin 40; 4.45V;
Pin 38; 0.0V;
Pin 35; 2.05V;
Pin 36; 1.94V
Pin 8; 0.0V
Pin 6; 1.12V
Pin 10; 9; 0.0V
Pin 11; 5.04V
Pin 18; 15; 16 0.0V
Pin 14; 4.78V
Pin 31; 4.58V
Pin 33; 1.11V
Pin 32; 1.54V
Pin 34; 6.16V
Pin 44; 1.12V
Pin 3; 1.12V
Pin 43; 1.12V
Pin 41; 1.12V
Pin 42; 1.12V
Pin 28; 4.57V
Pin 26; 1.11V
Pin 27; 1.53V
Pin 25; 6.15V
Pin 48; 0.57V
Pin 1; 0.47V
Pins 19; 29; 5.09V
Pin 46; 5.04V
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