Rectifier And Filter; Switching Element And Isolation Power Transformer - BenQ G2420HD Product Service Manual

#2 Rectifier and filter

AC Voltage (90-264V) is rectified and filtered by BD601, C605 (See Fig 3) and the DC Output
voltage is 1.4*(AC input). (See Fig.3)

#3 Switching element and Isolation power transformer

When the Q601 turns on, energy is stored in the transformer. During Q601 turn-off period, the
stored energy is delivered to the secondary of transformer. C614, R607, C607 and D601 are
snubber circuits. R615 is current sense resistor to control output power. (See Fig.4)
L6 E1
~
GSIB4A60-LF
BD601
4 1
+
-
~
Fig. 3
L605
Z45/100MHZ
R607
C607
68K
0.001U J
E3
D601
UF4007-LF
E4
L604
Z45/100MHZ
L603
Z45/100MHZ
Q601 C614
100P K
G
R615
0.22
Fig. 4
- 61 -
C605
+
150U 450V
<Spec>
E2
T601
1 12
2
E5
3 10
11
5
4
6 8