1. Mother Board Advanced Maintenance Methods

2. No Power improper maintenance methods
Power ON Flow Of P4SQ：
Figure (A)

3. No Power improper maintenance methods
Power ON Flow Of P4PE：
Figure (B)

4. No Power improper maintenance methods
Power ON Flow Of A7V600-F：
Figure (C)

5. No Power improper maintenance methods
Power ON Flow Of P4V800-X：
Figure (D)

6. No Power improper maintenance methods
Schematic display card protection:
Principle:
In normal operation, the red light does not shine, AGP_VOLT3V# as HIGH，Q14 Open
PSON# and PWR_PSON# Conduction. When the Card inserted or not inserted the wrong time, TYPEDEF# Will become HIGH，this Q15 open，AGP_VOLT3V#
Will be pulled to ground into a LOW, the red light off Q14 Closed, PSON # and PWR_PSON # disconnected, which Not the kind of electricity.
Figure (e)

7. No Power improper maintenance methods
CPU over-temperature protection schematic diagram:
Principle: In this figure, DXP ​​detection of this signal is temperature PIN, it is connected to a thermistor. normal working hours, PWR_PSON # and the PSON # is conduction, DXP ​​detect the CPU temperature exceeds its limit, Fengyun IC to Will PWR_PSON # and PSON # to turn off the system power off, so to protect the CPU overheat and burn Buzhi Yu.
Figure (f)

8. No Power improper maintenance methods
Specific maintenance steps:
Check 5VSB, 3VSB and PWRBTN # (3v or 5v) is OK. Plug in the power, press PWRBTN # PSON # signal with the oscilloscope to see if it is pulled Low. If the PSON # is pulled Low, but still can not give out ATXPOWER power, this situation is due to the internal power supply protection circuit operation, the main reason for this situation is a part of the motherboard or the power to ground short circuit between the short circuit. Check the motherboard for this is mainly on the +12 V, +5 V, +3 V and Vcore are not short-circuit to ground or each other. If the PSON # or for the High, then Next. For the next analysis is used depends on the specific motherboard Chipset. Models below are examples to illustrate: P4PE (Figure II) 1. Check PWR_PSON # This line is OK. (the amount of PWR_PSON # multimeter to the graphics card protection circuit from ATX) 2. Check PSON # whether there is action, if the action properly, check the graphics card protection circuit is working properly. 3. PSON # if no action is issued by the South Bridge SLP_S3 # Check whether there is normally issued, if OK, replace the ASUS chip. 4. If SLP_S3 not properly issued, the first check whether the start-32KHZ oscillator, oscillator with voltage, but if can not afford to vibration, replace the oscillator. For non-voltage, the first two legs Check diode oscillator value is normal, and then to the South Bridge 3VSB Check whether it is normal, if all OK, replace the South Bridge. 5. If 32KHZ oscillator is normal, then re-check the ASUS chips issued RSMRST # This signal is normal. If RSMRST # is OK, then you can try to replace the South Bridge. If RSMRST # is not normal, then check the supply ASUS chip 3VSB, 5VSB, and BAT is OK, if all OK, then replace the ASUS chip.

9. No Power improper maintenance methods
Specific maintenance steps:
A7V600-F (Figure III) Check PSON # This line is OK. (Table amount of electricity from PSON # to the graphics card protection circuit ATX) Check protection circuit card issued PWR_PSON # whether action, if the action properly, check the CPU over-temperature protection circuit is working properly. Check AS-016 chips sent SUSB is normal, if OK, then check the graphics card protection circuit is working correctly. Southbridge issued SUSB # Check whether it is normal, and if OK, replace the AS-016 chip. If SUSB # issued without the normal, check the supply Southbridge 32KHZ frequency, PWRBTN # and RSMRST # these signals are normal. If you are OK, you can try to replace the South Bridge. If 32KHZ oscillator sluggish, you can replace the oscillator. If no normal distribution PWRBTN # South Bridge, you can check the relevant circuit. If the AS-016 does not normally issue RSMRST #, you can check the BATT supply AS-016 and the 5VSB is OK, if correctly, you can replace the AS-016, or check the relevant line.

10. No Power improper maintenance methods
Specific maintenance steps:
P4V800-X (shown below) 1. Check PWR_PSON # This line is OK. (the amount of PWR_PSON # multimeter to the graphics card protection circuit from ATX) 2. Check Southbridge issued SUSB # signal is normal, if the signal is normal, you can replace the Super I / O. 3. If the southbridge is not issued SUSB #, then check the supply of South Bridge, 23KHZ, RSMRST # and IO_PME # is normal, three signals are OK if you can replace the South Bridge KHZ pulse, if not, then check the relevant line. 5. RSMRST # signal if not, then check the supply of Super I / O's 5VSB and BATT is normal, are OK if you can replace the Super I / O. 6. If IO_PME # not working properly, then look in the press PWRBTN # button, PWRBTN # pull and pull-down signal if the action, if you can replace the Super I / O.

11. 00 OR FF improper maintenance methods
For FF, 00 can not boot there are several different classification of the phenomenon will be described below (the PC-DL models as an example):
Shown on all points DEBUG
The main reason for this phenomenon is not PCIRST # signal, to quickly repair this phenomenon we must first understand the principles of the motherboard RESET signal is generated. Below:

12. 00 OR FF improper maintenance methods
Specific maintenance steps are as follows:
1. to get this board first Check the motherboard's basic operating voltage, Vcore, 1.5V, 2.5V and 1.8V. If one does not check the voltage of power supply output is related to the circuit. 2. Check RSTCON # whether 3V, if not then check +3 VSB and RSTCON # diode value is normal.      3. Check the motherboard of the fundamental frequency, supply Southbridge 14Mhz and 33Mhz.       4. Check southbridge supply the ICHPCIRST # AS-016 is normal, if normal to consider replacing the AS-016.       5. If the southbridge is not output ICHPCIRST #, the South Bridge ICH_PWROK Check the supply is correct, if OK, you can consider replacing the southbridge.       6. If ICH_PWROK problems, the supply of AS-016 Check the +5 V and the BATT voltage is normal, if it is normal, replace the AS-016.

13. 00 OR FF improper maintenance methods
2. DEBUG card lock data are all OK after the address FF
This phenomenon is mainly for the CPU does not read the BIOS information. BIOS, there are two connections, one to go ISA bus, LPC bus, another walk. For the PC-DL this aircraft, it is connected to LPC.
Specific maintenance steps are as follows:
Check BIOS on ICHPCIRST # is OK, normal, then a +3 V voltage, the signal after pressing the RSTCON # high to low by the sub-high. 2. Check BIOS on PCICLK_FWH is OK, normal, then you can measure with an oscilloscope to the 33Mhz frequency. 3. Check BIOS on FWH_IC is OK, this signal is used to set the BIOS is a model which, when high that the choice of the A / A MUX Mode (ISA architecture), is low that the FWH mode is selected (LPC Architecture), the board in this machine through a resistor in this signals Pull Low. 4. Check BIOS is on the FWHHINIT # OK, this is a BIOS initialization signal, normal, then you can measure with an oscilloscope to the +3 V voltage. 5. Check BIOS on LAD0 ~ LAD3 four signals are normal, with three tables and the oscilloscope with its two extremes and the voltage is normal. 6. If these signals are OK, as the BIOS information on the general air burning, can replace the BIOS.

14. 00 OR FF improper maintenance methods
CPU does not work
This phenomenon is not inserted plug CPU CPU DEBUG and run on the data card is the same.
Specific maintenance steps are as follows:
First Check Vcore voltage is normal, if not OK, then check the Vcore related lines. 2. Check CPU's CPUPWROK and CPU_RST # is normal, if CPUPWROK not, then check whether the working conditions of South Bridge OK, if all OK, you can replace the South Bridge. If not CPU_RST #, first check the supply voltage and frequency northbridge is normal, then check the HUB-LINK between north and south bridge line is normal, if the signal is OK, you can replace the North Bridge. 3. Check Host Bus frequency and CPU frequency is OK. 4. Check Host Bus's GTLREF is normal, the normal voltage of Vcore voltage two-thirds. 5. Check CPU's TESTHI signal is normal, if not correct for the CPU to the CPU will not work there.

15. 00 OR FF improper maintenance methods
DEBUG live data files on the card
This is like the CPU has to move now, but in reading the address data file or data errors lead to the machine.
Specific maintenance steps are as follows:
Check CPU of the HA [3:31] #, HD [0:63] #, HDSTBN [0:3] #, HDSTBP [0:3] # and HDBI [0:3] # signals are those OK, mainly through the amount of Measured to determine the value of two-body protection, for if there are Open or Short amount to the need to take the line to determine Socket or North Bridge. 2. Check HUB_LINK between north and south bridge signal is normal. DEBUG lock step when running, in the first time, DEBUG DATA and ADDRESS on the display is not correct, such as: DATA: FFFFFFFF ADD: 00BFBFD0, then check these signals. 3. Check PCI interface signals AD [0:31] #, C / BE [0:3] #, FRAME #, DEVSEL #, IRDY #, TRDY # and STOP # is OK. 4. If these signals are OK, it may be caused by bad bridge, south bridge replacement be replaced, to replace the North Bridge.