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Power On Sequence

Power On Sequence. Sephiroth Kwon GRMA 26-05-2009. OUTLINE. General Power On Sequence Power On Sequence (P5Q3) Power On Sequence (M3N78-VM) No Power Problem Debug Point. General Power On Sequence. 3VSB. PWRBTN. 5VSB. 1. 1/0. 1. South Bridge. PWRBTN. 0. PSON#. ATX TOP VIEW.

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Power On Sequence

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  1. Power On Sequence Sephiroth Kwon GRMA 26-05-2009

  2. OUTLINE • General Power On Sequence • Power On Sequence (P5Q3) • Power On Sequence (M3N78-VM) • No Power Problem Debug Point

  3. General Power On Sequence 3VSB PWRBTN 5VSB 1 1/0 1 South Bridge PWRBTN 0 PSON# ATX TOP VIEW PANNEL + 5 5VSB to 3VSB Linear Reg. + 12 Cap./ Res. + 5 5VSB - 5 PWOK GND GND GND + 5 GND GND 0 + 5 PSON GND GND - 12V + 3V IT8282 + 3V + 3V PSON Pull low circuit Super I/O PSON 0

  4. General Power On Sequence + 5 + 12 PWRBTN + 5 5VSB - 5 PWOK GND GND GND + 5 GND GND + 5 PSON GND GND - 12V + 3V + 3V + 3V PANNEL CPU SOCKET (2) CPURST (5) PG1 IDERST Circuit IDE SLOT (4) PWROK PCIRST (3) PCI SLOT North Bridge Circuit PSON South Bridge (1)

  5. Power On Sequence (P5Q3 Sample) S_PLTRST S_PLTRST B_ATX_PWROK GMCH POWER SUPPLY O_PWROK_NB O_PWROK 10 USER PRESS CRTL+ATL+DEL O_PCIRST#_PCIEX16_12 O_PSON# H_CPURST# O_PCIRST#_PCIEX1_123 6 7 7 Super I/O 9 PCI_PCIEX16 O_PWRBTNIN# O_PCIRST#_SLOT USER PRESS POWER BTN 3 PCI_PCIEX1 9 2 5 5 4 7 P_VRM_GD O_PWROK O_RSMRST# O_PWRBTN O_KB_RST# S_SLPS3# S_SLPS4# PCI SLOT EPU 7 RSTCON# S_PCIRST# User press Rest button ICH10R S_TRCRST# TPM 8 JMB363 User clear CMOS VA6308P 1 S_PLTRST# 8 VCORE H_CPUPWRGD 8 CPU LAN

  6. Power On Sequence(M3N78-VM) 14. CPU_RST# 13. PCI_RST# CPU MCP78 PCI SLOT 1,2 12. CPU_PWROK# 13. PCIE_RST# 10. 1.2VHT_EN PCIE X1 9. VCORE_PG 8. VCORE_EN 7.PWROK_SB 11.SIO_RST# 3.SIO_PWRBTN# 4.SUSB# 4.SUSC# 1.RSMRST# VRM 6. 12V 6. 3V 6. 5V SIO ITE8712F PCIE X16 ATX Power 13.PCIERST# IDE Port 5. PSON# 11. IDE_RST# 2. PWR_BTN#

  7. No Power Problem Debug Point POWER UP PROBLEM • Check if any burned components or traces • Check no voltages short with GND such as +5, +12 , +5VSB, +3, -12, +3VSB, VCORE 1.5V, 2.5V • Check Battery voltage • Check X’tal 32.768 KHz • Check 5VSB ,3VSB, PWRBTN# • Check PSON signal & related circuit

  8. Thank You!

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