Page 70 - GIGABYTE Service Manual-v3.0-110101
P. 70
Figure 4-7: Sequence of MA790FXT-UD5P
4.3 Clock Check
Clock Check step: (EX: P35-DS3L)
01. Check the voltage and ground pins of generator (3.3V)
(Ps: Check all voltage for different clock blocks)
02. Check Crystal 14.318MHz
03. Check the enable signal: -SYS_RST, CK_PWRGD, -S4_S5
Table 4-1: Power Supply Voltage (Power On)
4.3.1 Clock EN Signal Check
The Enable signal for clock generator:
01.-SYS_RST: It’s connected from front panel and pull high by 5V. If this signal on
clock generator is not 5V, then clock will not start. Check the PCB trace and pull high
resistor.
48
