M88 Schematic training materials
M88 System block diagram
Power up sequence When insert adapter or battery ====>PPDCIN_G3H(16.5V) U7800===>PP3V42_G3H(3.42V) U7950===>PPBUS_G3H(S5--S3) Press power button===>U4900 (SMC_ONOFF_L) U7900===> PPBUS_G3H(S0) U4900===>U2300 (PM_PWRBTN_L) U2300===>U4900 (SUS_CLK_SB) U2300===> Q7000,Q7010 (PM_S4_STATE_L) U2300===> Q7020,Q7030 (PM_S3_STATE_L) U7880===>U4900(ALL_SYS_PWRGD)
U4900===>U7100 (IMVP_VR_ON) U7100===>U2300(VR_PWRGD_CLKEN_L) U7100===>U2300 (VR_PWRGOOD_DELAY) U2300===>U1400 (PLT_RST_L) 11. U1400===>U1000 (FSB_CPURST_L) System boot, read BOOTROM, check HW, IO, etc
Power block diagram
Sensor location
Penryn 2.6G, 2.5G CPU 64bit, 6MB L2 cache,800MB FSB
SB and NB M88 SB and NB is same as M76. The basic function is the same. NB: DDRII memory, internal Graphic controller (CRT,DVI,S-VIDEO); SB: IO device, include HDD,ODD,FW,ENET,AUDIO,BT, IR, CAMERA...
GPU NVIDIA M88 GPU uses NVIDIA chip.PCI- E signals of between NB and nVIDIA chip are the same as M76 which is PCI-E x 16 (differential pairs) topology.
Frame buffer interface
LCD Backlight M76:CCFL Backlight
M88:M88 uses LED backlight. Delete U9560 Controller.Sihnal PWM is from GPU.
1. 8V Frame Buffer Regulator M88 uses U9300 to provide 1 1.8V Frame Buffer Regulator M88 uses U9300 to provide 1.8V for 8pcs Frame Buffer.this is different from M76 that use U7500 regulates 1.8V for both DDR2 and 4 pcsBuffer Regulator
M88 LIO Schematic
M88 LIO schematic is same as M76. The difference between M88 and M76 about M88 is only LIO FPC. In LIO,audio controller U6200 is important chip. If any issue such as Mic test fail,speaker test fail about audio ,you can double check the function.
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