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No, i dint change ISL.
voltage on AMON p9= .171 ( only charger connected )
voltage on BMON p15= .172 ( only charger connected )
voltage on AMON p9= .172 ( battery connected )
voltage on BMON p15= .104 ( battery connected )
resistance between pins 17/18=...
I found missing R4844, replase it now t/p working fine with the following measurement
U4810 (diode mode ) p2=.509 and p6=.432.
Still i see j4800 p2=.441 and it should be OL compare to good one. and my battery is not detected.
I tried two battery. All other functions of the mac are working...
820-3435-B kb and T/P not woirking.
It was water damaged.Did ultrasonic cleaning, check with good known
all cables and i/o card but no luck.
compare with good known mb Diode mode measurement all are good, except J4800 pin2 is .441 but the
good one mb show me OL. So i checked R4850=33 OHM ...
check U8300/30/40 voltages in these 5 seconds...as following
u8300:
1= 5 then drop 3v , 2= 3.2 v drop 0v , 4=5v stable. ,6= 0v , 7= 0v ,
U8330: P1=0V, P2,5=0V,P3=3.3v & drop 0V, P6=3.3v & drop 0V, P7=0V, P8=3.3V.
U8340: P4=0V, P5=3.3V, P1=0V.
After 10 minutes ultrasonic and 8 hours dry up, found
video connector pin 3&4= 5.1v, p1=0v, p5=3.3v but after 5 seconds it drop 0 v.
Found water damage around U8300, and pin1=5v, p2=0v, p4= 5v, p6=0v and p7=0v.
Please help me what it could be the problem. Thanks in advance.
hi everybody, after long time back to work. This is water damage ,A1502., 820-4924-A Turn on but no image no bklight but chime.
ppvout-s0=0v
pp5vr3v3_sw-lcd= 0v
connector pin 28,29,30= 0v and pin5 =0v
bklt-en=0v
smc-lid =3.4v
scl=.458 and sda=.468 diode mode.
U8330: PIN1=0V...
Turn on and chime with display logo but no back light. LCD connector was corroded chance it and light back in normal.After 10 minutes testing again no back light and no display. With LCD CONNECTED
1. PPVOUT_S0_LCDBKLT=0v, I2C_BKLT_SCL=5v, I2C_BKLT_SDA=5v, LCD_IRQ_L=3.3v...