主板维修基础(精)

5VDUAL
3 2
1 Q187 APE1084GH/TO252/5A
3VDUAL
BC540 0.1u/6/Y 5V/25V/Z/X
R1133
R1128 100/6/1
+
EC117 100u/D/10V/57
1K/4/1
-RSMRST [19,24]
C408 0.01u/4/X7R/16V/K
R1129 169/6/1
M/B 簡易DEBUG步驟 (以INTEL為例]
Prepared by ELVIS JOUNG 07/06/2007
1.拿到FAIL M/B 該如何?
[目視法]
◆首先檢查整片M/B外觀,確認是否完整,有無破裂刮痕(TRACE)、燒毀 (零件、 MOSFET 、 電容、 CHOKE)、板彎、零件歪斜掉落、異物 沾黏痕跡(含SOCKET 、SLOT 、PIN HEADER 、CONNECTOR 、 零件PIN腳) 、DIP PIN/ICT點有無短路、氧化腐蝕…等等。 ◆維修工程師依據外觀損毀程度初判為人為/非人為損壞,進而能否實施 維修(注意保固年限)
DDR18V
+12V
5VDUAL
5VDUAL
CHOKE08U-15A_1P-2
1 3
2
R324 20K/4/1
D9 BAT54C/SOT23/200mA
C179
L8
0.1u/ 6/Y 5V/25V/ Z
R2828 2.2/6
1.2uH/20A/PMU109/W/D
Q24 2SK3918/TO252/1300pF/7.5m
21
9
5V 5VSB
22 5V
12V 10
23 5V
11 12V
24 GND 3.3V 12
VCC3 VCC
5VSB
+12V
C1332 0. 1u/4/ Y 5V/16V/Z
BC138
C259
0.1u/4/Y5V/16V/Z 0.1u/4/Y5V/16V/Z
BC135 0. 1u/ 4/ Y 5V/16V/Z
[19,24] -SLP_S3
Date: 8/16/2006
C1335 0.1u/4/Y 5V/16V/Z
C173 0.1u/4/Y 5V/16V/Z
5VSB R366 1K/4/1
5VSB
5 +
6 -
8
U45B
7 KA393D/SO8
R1917 8.2K/4
5VDUAL 5VSB
P_GATE
AP9435K/SOT223/507pF/50m
ATX POWER CONNECTOR
-12V VCC3
[24,29] -PSON
BC129 0. 1u/4/ Y 5V/16V/Z
VCC
BC131 0. 1u/ 4/ Y 5V/16V/Z
ATX 13 3.3V 3.3V 1
14 -12V 3.3V 2
15
3
GND GND
16 PSON 5V 4
17
BC129 0. 1u/ 4/ Y 5V/16V/Z
VCC
BC131 0. 1u/4/ Y 5V/16V/Z
ATX
13
1
3.3V 3.3V
14 -12V 3.3V 2
15 GND GND 3
16
4
PSON 5V
17 GND GND 5
18 GND 5V 6
19 GND GND 7
20 -5V POK 8
5
GND GND
18 GND 5V 6
19 GND GND 7
20
8
-5V POK
21 5V 5VSB 9
22 5V
10 12V
23 5V
12V 11
24 GND 3.3V 12
VCC3 VCC
5VSB
+12V
C1332 0. 1u/4/ Y 5V/16V/Z
BC138
C259
0.1u/4/Y5V/16V/Z 0.1u/4/Y5V/16V/Z
BC135 0. 1u/ 4/ Y 5V/16V/Z
APW/2*12/IV/OC/OP/4.2/VA/SN/LK/2H
PWOK [24]
Date: 8/16/2006
量測5VDUAL
5VDUAL
VCC=4.2V
VCC R341
8.2K/4
R1899 12.1K/4/1
C1336 1u/6/Y 5V/10V/Z
Q311
1
2
4
3
1
1
+ EC131
+
100u/D/10V/57
4
5VDUAL_GATE
5VSB
2 3
1
D
G
S
SOT23 Q310 2N7002/SOT23/25pF21
1000u/D/6.3V/8C/36m 1_5LEVEL
D
G
S
SOT23
Q25 2N7002/SOT23/25pF/5
Date: 8/16/2006
◆可POWER ON量測: ATX POWER:+12V,VCC,VCC3,-12V,-5V(少用); 此時-PSON(0V) 、POK(5V) 。 ATX_12V:主要給CPU VCORE +12V
ATX POWER CONNECTOR
-12V VCC3
[24,29] -PSON
APW/2*12/IV/OC/OP/4.2/VA/SN/LK/2H
PWOK [24]
V12
ATX_12V
4 +12V GND 1
3
2
+12V GND
BC6 0.1u/6/Y 5V/25V/Z
APW/2*2/IV/OC/P/4.2/VA/SN/OH
Date: 8/16/2006
◆量測DDRII POWER DDR18V(1.8V~)
5VSB
8
3 +
2 -
U45A 1
KA393D/SO8
+12V
R1898 1K/4/1
Q184_G
VCC
2SK3918/TO252/1300pF/7.5m
Q184
5VDUAL
1 2
3
4
5VSB
R1900
1K/4/1
R333 1K/4/1
+12V=10V
+12V R1901
8.2K/4
R1902 2.74K/4/1
Date: 8/16/2006
2.[三用電錶檢測]:主要量測POWER、OPEN/SHORT、阻抗… ◆插入ATX POWER CONNECTOR,(CPU/DDR/相關週邊DEVICE不上件), 量測M/B POWER。 ◆先量測STB POWER(先不要POWER ON),確認ATX 5VSB(5V) 、-PSON(5V) 、POK(0V)
2 3
1 2 3 1
2 3
1
R1903 8.2K/4
Q35
C180
1n/4/X7R/50V/K/X
SOT23
MMBT2222A/SOT23/600mA/40
G
S
SOT23
Q312 2N7002/SOT23/25pF/5
量測3VDUAL(此POWER影響能否PWR ON)
3VDUAL CIRCUIT