South Bridge quickly determine whether good or bad
1, by measuring PCI slots, AGP slot right to fight for damage resistance can be found north and south bridge
1, PCI slot for all of the AD composite wire-to-ground resistance is fighting for values between 300 and 800, indicating a good Southbridge; if from the infinite, indicating Southbridge Xu Han; if three or more on-3, Description South Bridge Bad
2, AGP slot on the ground all the AD composite wire-to-ground resistance is fighting for values between 300 and 800, indicating a good Northbridge; if from the infinite, indicating Northbridge Xu Han; if three or more on-3, indicating Northbridge Bad
3, memory slot, through the data lines to fight resistance to judge, all have values between 300 to 800, indicating a good Northbridge; if from the infinite, indicating Northbridge Xu Han; if three or more on-3, indicating Northbridge bad.
Second, the main power supply part of the output inductor at one end or Q1 farm tube S pole, Q2 tube D great playing field resistance, and without inserted CPU or false load cases, namely, good or bad judgments Northbridge
1, in the 40 or so values for normal
2, at 20 ~ 30 or so for the North Bridge with minor damage
3, at 10 North Bridge damage to the following instructions
Third, for the IDE port, USB port to play resistance to determine whether there is damage to South Bridge
1, IDE port, playing two 9-pin, 11 ~ 19 needles, 21 ~ 29 needles, 37 ~ 39 needles, there are about 600-to-ground resistance and more or less normal values for the South Bridge; has infinitely large or more than 1000 values for Southbridge IDE Koudao cold solder joint or a small resistor between the blown NQ; if significant resistance is too small for the South Bridge is damaged
2, USB ports, two USB port 2,3 fight a total of four pin-pin resistance, if the value of about 500 shows Southbridge normal; if infinity shows them to Southbridge Southbridge cold solder joint, or between the a small resistor is damaged; if damage resistance significantly smaller note Southbridge
IO somewhat difficult to directly determine good and bad. Different different definitions of IO pins to determine a different approach
I took W83627HF example, saying that perhaps give some thought!
61 #?? +5 Vsb standby voltage
70 #?? +3.3 V standby voltage
72 #?? +5 V standby voltage, which may trigger after low
74 #, 76 # battery voltage input (+3 V)
12 #, 48 #, 77 #, 97 #, 114 #?? +5 Vcc (core voltage)
28 #?? +3.3 Vcc (core voltage)
Foot-to-ground short-circuit any of the above can be judged in general a bad IO
31 # -37 # printer management
58 #, 59 #, 60 #, 62 #, 63 #, 65 #, 66 # Mouse Keyboard Manager
Value of more than two dozen diode can be judged, if not equal in general a bad IO
Say is that more than under normal circumstances! Moreover, Yao Da-pin so much the value of a lot of trouble
To determine whether an accurate IO or bad, only by substitution of the
South Bridge quickly determine whether good or bad
1, PCI a14-to-ground resistance of less than 80 feet.
2, South Bridge-to-ground short-circuit around the capacitor. .
3, USB data cable-to-ground short-circuit.
4, standby time, Southbridge high temperature. &
5, COMS foot jumper the middle ground short circuit.
6, 1117-to-ground short-circuit the middle legs.
North and south bridge to judge good and bad There are several ways to introduce the following commonly used methods:
1. Electricity. The amount of electricity near the South Bridge chip, such as whether there is short-circuited 1117
2. Signal. Test usb port signal-to-ground resistance, such as too is zero, Southbridge bad.