DV172 LCD Monitor Service Guide
Circuit Operation Theory
5
Fig. 4
(d) Rectifier and filter
D701 and C703 are to produce DC output. L701 and C704 are to suppress high Frequency switching
spikes. (See Fig.5)
Fig. 5
(e) PWM Controller
The current mode control IC UC3842B is used to control PWM. When the VCC terminal of it gets
16V, IC601 turns on. +5V will be set up at Pin8 through soft start circuit, which includes R617, C611,
D606 and D605. R616 and C610 generate a fixed frequency saw-tooth wave at Pin4.
Summary of Contents for DV172
Page 22: ...DV172 LCD Monitor Service Guide Circuit Operation Theory 8 ...
Page 31: ...DV172 LCD Monitor Service Guide Alignment procedure 5 b Speaker wire ...
Page 32: ...DV172 LCD Monitor Service Guide Alignment procedure 6 c LVDS wire d Power grounding ...
Page 41: ...3 94 53 L5304 001 F DISK MEA DV172 ...
Page 45: ......
Page 46: ......