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

[turbo]

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
[TABLE="border: 0, cellpadding: 0, cellspacing: 0, width: 493"]
[TR]
[TD="align: right"]1[/TD]
[TD="align: right"]0[/TD]
[TD] [/TD]
[TD]CHGR_AGATE[/TD]
[/TR]
[TR]
[TD="align: right"]2[/TD]
[TD="align: right"]16.48[/TD]
[TD] [/TD]
[TD]CHGR_DCIN[/TD]
[/TR]
[TR]
[TD="align: right"]3[/TD]
[TD="align: right"]4[/TD]
[TD] [/TD]
[TD]CHGR_ACIN[/TD]
[/TR]
[TR]
[TD="align: right"]4[/TD]
[TD="align: right"]3.32[/TD]
[TD] [/TD]
[TD]CHGR_VFRQ[/TD]
[/TR]
[TR]
[TD="align: right"]5[/TD]
[TD="align: right"]0.23[/TD]
[TD] [/TD]
[TD]CHGR_ICOMP[/TD]
[/TR]
[TR]
[TD="align: right"]6[/TD]
[TD="align: right"]3.3[/TD]
[TD] [/TD]
[TD]CHGR_CELL[/TD]
[/TR]
[TR]
[TD="align: right"]7[/TD]
[TD="align: right"]0.72[/TD]
[TD] [/TD]
[TD]CHGR_VCOMP[/TD]
[/TR]
[TR]
[TD="align: right"]8[/TD]
[TD="align: right"]0.27[/TD]
[TD] [/TD]
[TD]CHGR_VNEG[/TD]
[/TR]
[TR]
[TD="align: right"]9[/TD]
[TD="align: right"]2.25[/TD]
[TD] [/TD]
[TD]CHGR_AMON[/TD]
[/TR]
[TR]
[TD="align: right"]10[/TD]
[TD="align: right"]3.35[/TD]
[TD] [/TD]
[TD]SMBUS_CHGR_SDA[/TD]
[/TR]
[TR]
[TD="align: right"]11[/TD]
[TD="align: right"]3.35[/TD]
[TD] [/TD]
[TD]SMBUS_CHGR_SCL[/TD]
[/TR]
[TR]
[TD="align: right"]12[/TD]
[TD="align: right"]3.35[/TD]
[TD] [/TD]
[TD]VHST[/TD]
[/TR]
[TR]
[TD="align: right"]13[/TD]
[TD="align: right"]3.32[/TD]
[TD] [/TD]
[TD]CHGR_RST_L[/TD]
[/TR]
[TR]
[TD="align: right"]14[/TD]
[TD="align: right"]3.2[/TD]
[TD] [/TD]
[TD]CHGR_ACOK[/TD]
[/TR]
[TR]
[TD="align: right"]15[/TD]
[TD="align: right"]0.05[/TD]
[TD] [/TD]
[TD]CHGR_BMON[/TD]
[/TR]
[TR]
[TD="align: right"]16[/TD]
[TD="align: right"]1.7[/TD]
[TD] [/TD]
[TD]CHGR_BGATE[/TD]
[/TR]
[TR]
[TD="align: right"]17[/TD]
[TD="align: right"]1.61[/TD]
[TD] [/TD]
[TD]CHGR_CSO_N[/TD]
[/TR]
[TR]
[TD="align: right"]18[/TD]
[TD="align: right"]1.61[/TD]
[TD] [/TD]
[TD]CHGR_CSO_P[/TD]
[/TR]
[TR]
[TD="align: right"]19[/TD]
[TD="align: right"]5.4[/TD]
[TD] [/TD]
[TD]vdd[/TD]
[/TR]
[TR]
[TD="align: right"]20[/TD]
[TD="align: right"]5.4[/TD]
[TD] [/TD]
[TD]vddp[/TD]
[/TR]
[TR]
[TD="align: right"]21[/TD]
[TD="align: right"]0[/TD]
[TD] [/TD]
[TD]CHGR_LGATE[/TD]
[/TR]
[TR]
[TD="align: right"]22[/TD]
[TD="align: right"]0[/TD]
[TD] [/TD]
[TD]GND[/TD]
[/TR]
[TR]
[TD="align: right"]23[/TD]
[TD="align: right"]1.6[/TD]
[TD] [/TD]
[TD]CHGR_PHASE[/TD]
[/TR]
[TR]
[TD="align: right"]24[/TD]
[TD="align: right"]1.6[/TD]
[TD] [/TD]
[TD]CHGR_UGATE[/TD]
[/TR]
[TR]
[TD="align: right"]25[/TD]
[TD="align: right"]5[/TD]
[TD] [/TD]
[TD]CHGR_BOOT[/TD]
[/TR]
[TR]
[TD="align: right"]26[/TD]
[TD="align: right"]0.001[/TD]
[TD] [/TD]
[TD]CHGR_SGATE[/TD]
[/TR]
[TR]
[TD="align: right"]27[/TD]
[TD="align: right"]16.13[/TD]
[TD] [/TD]
[TD]CHGR_CSI_N[/TD]
[/TR]
[TR]
[TD="align: right"]28[/TD]
[TD="align: right"]16.66[/TD]
[TD] [/TD]
[TD]CHGR_CSI_N[/TD]
[/TR]
[/TABLE]

 

[larossmann]

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]

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?? .

 

[larossmann]

is rtc voltage present? need more hints!

 

[turbo]

here is u2600 all pin value
[TABLE="border: 0, cellpadding: 0, cellspacing: 0, width: 48"]
[TR]
[TD="width: 64, align: right"]3.3[/TD]
[/TR]
[TR]
[TD="align: right"]3.3[/TD]
[/TR]
[TR]
[TD="align: right"]0[/TD]
[/TR]
[TR]
[TD="align: right"]0.6[/TD]
[/TR]
[TR]
[TD="align: right"]0[/TD]
[/TR]
[TR]
[TD="align: right"]0[/TD]
[/TR]
[TR]
[TD="align: right"]0[/TD]
[/TR]
[TR]
[TD="align: right"]0.08[/TD]
[/TR]
[TR]
[TD="align: right"]0[/TD]
[/TR]
[TR]
[TD="align: right"]0[/TD]
[/TR]
[TR]
[TD="align: right"]0[/TD]
[/TR]
[TR]
[TD="align: right"]0.22[/TD]
[/TR]
[TR]
[TD="align: right"]3.3[/TD]
[/TR]
[TR]
[TD="align: right"]0[/TD]
[/TR]
[TR]
[TD="align: right"]0[/TD]
[/TR]
[TR]
[TD="align: right"]0[/TD]
[/TR]
[/TABLE]
,

 

[aprendiz]

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