820-3332 board retina 15" , no ppbus 12.6v, only 1.2v, green light ok

turbo

Member
this 820-3332 retina 15" board don't have any ppbus g3h!, green is on, i changed ISL6259 chip, still no luck only 1.2 V in ppbus. also dont see any short to ground

any advice!!!

im attaching isl pin voltage pls chk
10 CHGR_AGATE
216.48 CHGR_DCIN
34 CHGR_ACIN
43.32 CHGR_VFRQ
50.23 CHGR_ICOMP
63.3 CHGR_CELL
70.72 CHGR_VCOMP
80.27 CHGR_VNEG
92.25 CHGR_AMON
103.35 SMBUS_CHGR_SDA
113.35 SMBUS_CHGR_SCL
123.35 VHST
133.32 CHGR_RST_L
143.2 CHGR_ACOK
150.05 CHGR_BMON
161.7 CHGR_BGATE
171.61 CHGR_CSO_N
181.61 CHGR_CSO_P
195.4 vdd
205.4 vddp
210 CHGR_LGATE
220 GND
231.6 CHGR_PHASE
241.6 CHGR_UGATE
255 CHGR_BOOT
260.001 CHGR_SGATE
2716.13 CHGR_CSI_N
2816.66 CHGR_CSI_N
 
Last edited:

larossmann

Administrator
Staff member
Check resistance of R7005

Check resistance between pins 27/28 of U7000, should be 20.020 ohms

Check resistance between pins 17/18 of U7000, should be 2.2005 ohms
 

turbo

Member
wow louis you are seriously smart. it was r7021 and r7022, notw ppbus_g3h is good 12.6 v

now no 5v, rail. , u7201 making 3.3v but no 5v, pin 4 =P5VS4_EN is missing ..... then i found PM_SLP_S5_L is missing.. for missing PM_SLP_S5_L ... what do i chk ? thanks in advance. which rail power the u1800?? .
 
Last edited:

aprendiz

Moderator
RTC voltage = PPVRTC_G3_OUT......... Also check R1800-R1803 should have about 3V each side and check SYSCLK_CLK32K_RTC with oscilloscope 32Khz.....
 
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