Asus repair. Clock. (Lesson 2)

1.

CLOCK
Sephiroth Kwon
GRMA
20-05-2009

2.

OUTLINE
Clock Distribution Diagram
Signal Description
Repair Flow Chart
Repair Technique

3.

CLOCK Distribution Diagram
MCHHCLK/# 200/266MHZ
P5Q Deluxe
CK_100M_MCH/# 100MHZ
CK_96M_DREF/# 96MHZ
CPUHCLK
200/266/333MHZ
Intel
BearLake
GMCH
M_CHB_CLK/#
DDR2 1,2,3,4
CK_100M_ICH/# 100MHZ
Intel
LGA775
CK_100M_SATA/# 100MHZ
CK_33M_ICH/# 33MHZ
Clock
Chip
CK_48M_USB/# 48MHZ
Intel
ICH9
BITCLK 24MHZ
CK_14M_ICH/# 14.318MHZ
CK_33MHZ
PCI Slot
CK_100M_PE16/# 100MHZ
VIA6308
CK_100M_PE1/# 100MHZ
TPM
CK_100M_PE1/# 100MHZ
PCIEx16 Slot
PCIEx1 Slot
Attansic L1
CK_48M_SIO 48MHZ
CK_33M_SIO 33MHZ
W83667EHF
AUDIO Code

4.

CLOCK Distribution Diagram
M4N78 AM

5.

CLOCK Distribution Diagram
M4A79 DELUX

6.

Signal Description
1.Sometimes the Clock chip connect one Diode or BJT
component. It depends on designer.
3V
3V
3V
3V
Inductor
14.318 MHZ
Inductor
Clock
Clock
Generator
Generator
14.318 MHZ
PG
Figure A.
Diode
BJT
SLP_S3#
SLP_S3#
South
Bridge
PG
Figure B.

7.

Signal Description
8
• Sometimes we can find BAT54AW near ICS.
• VRMPWRGD and SLP_S3# must be 3V
• Finally, CLKVCC offer 3V PWRGD to Clock
Generator .
• If Clock Generator doesn’t work, you must measure
CLKVCC3
this PWRGD signal first.
CRN1D
7
8.2KOHM
(25)
R_ICH_VRMPWRGD
(25,34)
SLP_S3#
1
CD2
3
2
BAT54AW
C_PG

8.

Repair Flow Chart
START
Visual Inspection
check CLK Gen. and related small
components are ok
NG
OK
Measure CLK Gen. Voltage Input
Change damaged CLK
Gen.& NG components
NG
NG
Check CLK Vcc 3V &
related trace component
OK
Measure X’TAL 14.318Mhz is ok
NG
Check X’TAL & related
two Capacitors are ok
OK
Change NG X’TAL or
Capacitor
OK
NG
NG
Trace the circuit, check
related trace & resistor,
capacitor
Fix any trace open and
change any NG RLC
component
NG
OK
Change CLK Generator
Fix any trace open and
change any NG RLC
component
NG
OK
Check which CLK signal is wrong
OK
Finished
OK

9.

Repair Technique-Visual Inspection
Visual Inspection to check Clock
Generator and related small
components are not damaged.
1

10.

Repair Technique-Measure Vcc_CLK
Use Multi-Meter or Oscilloscope to
measure Clock voltage 3.3V is ok.
2

11.

Repair Technique-Measure CLK X’TAL
Use Oscilloscope to measure
Clock X’TAL 14.318Mhz is ok.
3-1
3-2

12.

Repair Technique-Check Individual NG signal
Use Oscilloscope to
measure every individual
CLK signal. If find error
please trace the circuit to
find it’s connection.
4
If related RLC components
are ok but CLK still is NG
please try to change CLK
generator at last.

13.

Thank You!