Power Block Diagram; Function Test - Dell E173FP - 17" LCD Monitor Service Manual

5.3.2Power Block Diagram

PWPC1742LGD1

Function test

R8
CCFL
M4
R6 R9
Vrms
METER V
CCFL 10
M3
R7
Vrms
METER V
10
R12
CCFL
R10 M6
R13
CCFL
Vrms
METER V
10
M5
R11
Vrms
METER V
10
Function test step :
Step1 :
1. Adjust VR1 ( Set Vdim voltage from 0V to 5V) , then check M3 /
M4/M5/M6 Vrms .
2. Check M3 / M4/M5/M6operating frequency. (
note 1 )
Note 1: M3 / M4/M5/M6 need to use two channel multimeter , such as
FLUKE 45 , or use the oscilloscope check frequency.
DELL E173FP Service Manual
CON205
1
2
CON206
1
2
Model name :
PWPC1742LGD1
PCB
CON207
NO.715L1283-1
1
2
CON208
1
2
CN102
1
ON/OFF
2
3
DIM
4
5
12V
6
7
8
5V
9
10
11
GND
12
GND
L N
CN901
AC IN
Specification :
M1 = 12V +- 0.5V , M2 = 5V +- 0.25V
1. M3 / M4/M5/M6 = 6.5 +- 5 mV @
DIM= 5V
M3 / M4 /M5/M6= 3.0 +- 5 mV @
DIM= 0V
2. M3 / M4/M5/M6= 55KHz
+- 5 KHz
17
M2 M1
R2 R1
V
V
METER V METER V
5 100
R4
560
VR1
10K
R5
100