CLOCK

OUTLINE
• Clock Distribution Diagram
• Signal Description
•• RReeppaaiirr FFllooww CChhaarrtt
• Repair Technique

CLOCK Distribution Diagram
P5Q Deluxe MCHHCLK/# 200/266MHZ
Intel
M_CHB_CLK/#
CK_100M_MCH/# 100MHZ
BearLake DDR2 1,2,3,4
CCPPUUHHCCLLKK CCKK_9966MM_DDRREEFF//## 9966MMHHZZ
GMCH
200/266/333MHZ
CK_100M_ICH/# 100MHZ
Intel
LGA775 CCKK_110000MM_SSAATTAA//## 110000MMHHZZ
BITCLK 24MHZ
CK_33M_ICH/# 33MHZ
Intel
AUDIO Code
CK_48M_USB/# 48MHZ
CClloocckk IICCHH99
Chip CK_14M_ICH/# 14.318MHZ
CK_33MHZ
PCI Slot
CK_100M_PE16/# 100MHZ
PCIEx16 Slot
VIA6308
CK_100M_PE1/# 100MHZ
PCIEx1 Slot
TPM
CK_100M_PE1/# 100MHZ
Attansic L1
CK_48M_SIO 48MHZ
WW8833666677EEHHFF
CCKK_3333MM_SSIIOO 3333MMHHZZ

CLOCK Distribution Diagram
M4N78 AM

CLOCK Distribution Diagram
M4A79 DELUX

Signal Description
1.Sometimes the Clock chip connect one Diode or BJT
compponent. It deppends on desiggner.
3V 3V
3V 3V
Inductor Inductor
CClloocckk CClloocckk
Generator Generator
14.318 MHZ 14.318 MHZ
PG
PG
Figure A. BJT Diode
Figure B.
SLP_S3# SLP_S3#
South
Bridgge

Signal Description
• 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
tthhiis PPWWRRGGDD siignall ffiirstt.
8
CLKVCC3
CRN1D
8.2KOHM
7
CD2
1
(25) R_ICH_VRMPWRGD
3
2
(25,34) SLP_S3#
7
C_PG
BAT54AW

Repair Flow Chart
START
VViissuuaall IInnssppeeccttiioonn
NG CChhange ddamagedd CCLLKK OK
check CLK Gen. and related small
Gen.& NG components
components are ok
OK NG
FFiixx aannyy ttrraaccee ooppeenn aanndd
Check CLK Vcc 3V & OK
NG
change any NG RLC
Measure CLK Gen. Voltage Input
related trace component
component
OK NG
OK
NG Check X’TAL & related Change NG X’TAL or
Measure X’TAL 14.318Mhz is ok
two Capacitors are ok Capacitor
NG
OOKK
Trace the circuit, check Fix any trace open and
OK
NG
related trace & resistor, change any NG RLC
Check which CLK signal is wrong
capacitor component
NG
OK
Change CLK Generator Finished

Repair Technique-Visual Inspection
VViissuuaall IInnssppeeccttiioonn ttoo cchheecckk CClloocckk
Generator and related small
components are not damaged.
1

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

Repair Technique-Measure CLK X’TAL
Use Oscilloscope to measure
Clock X’TAL 14.318Mhz is ok.
3-1
33-22

Repair Technique-Check Individual NG signal
UUssee OOsscciilllloossccooppee ttoo
measure every individual
CLK signal. If find error
pplleeaassee ttrraaccee tthhee cciirrccuuiitt ttoo
find it’s connection.
4
If related RLC components
are ok but CLK still is NG
pplleeaassee ttrryy ttoo cchhaannggee CCLLKK
generator at last.