4.1.1 Power Supply/M/B Voltage confirmation
4.1.2 The input and output characteristic test of power
4.1.3 Testing intention: Check input and output to find whether or not short circuit
4.2 checking method:
Use a multimeter set as resistance stalls, measure AC input of the power module, and check
voltage inputs on the main board to find whether or not short circuit to ground.
No.
Items
Test Points
Standard
1
The resistance of AC input of the power
module
AC input connector XS901 no short circuit
2
The resistance of 12V output on the main
board
R1
no short circuit
3
The resistance of 5Vstb output on the main
board
C912
no short circuit
4
The resistance of 5VA output on the main
board
C390
no short circuit
5
The resistance of 3.3Vstb output on the main
board
C47
no short circuit
6
The resistance of 1.8V_DDR2 output of the
main board
U27 Pin2
no short circuit
7
The resistance of 1.26V output of the main
board
C395
no short circuit
8
The resistance of Tuner5V output of the
mainboard
U28 Pin2
No
short
circuit
9
The resistance of VCC-Panel output of the
mainboard
C58
no short circuit
10
The resistance of 3V3_Normal output of the
main board
U23 Pin2
no short circuit
4.3 Signal Board part
4.3.1 Signal board power part
Signal Board power distribution
3.3VSTB
U23(3.3V)
Q37(5V)
+3.3V_Normal
U27(2.5V)
U6(1.32V)
+2.5V_Normal
+1.2V_VDDC
+5V_USB2
U908(12V)
+12V
U901(5V)
U32(12V)
U28(5V)
TUNER
Q3
PANEL VCC
U20(3.3V)
