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Feed-back Circuit
R832
10K F
R819
3M
R846
1K J
R847
1K J
R825
442
R820
4.7K F
C845
(OPEN)
R827
442
C837
0.033U K
CN801
2062204102
1
1
2
2
CN802
2062204102
1
1
2
2
C814
5P D
D809
BAV99
A
J
K
R824
3M
R823
100K
C819
0.22U M
P07
D805
BAV70
A1
J
A2
C815
2700P J
.
.
.
T801
1J.26049.061
1
8
6
7
4
3
C817
15P J
TP801
TP802
TP803
TP804
F2
F1
P08
Fig.2
Fig. 2 shows the feedback circuit consists of a lamp, R846, D809, R825, R827 and C837.
With the lamp current through D809, a half sin-waveform voltage signal is produced. We may get the
Maximum value through R825/R827/C837.
After OZ9938 gets the feedback voltage signal from PIN5, the duty of the PWM driver outputs is
decided.
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51
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Summary of Contents for T201WA
Page 25: ...4 Disassembly Assembly 4 1 Exploded View 25...
Page 26: ...4 2 Disassembly Assembly 26...
Page 27: ...27...
Page 30: ...30 b click select Parallel...
Page 31: ...c Modify Speed to 140000 Hz in Parallel item Click device finish 31...
Page 32: ...d Follow the follow steps in turn link I2C BD power cable signal cable 32...
Page 34: ...34...
Page 53: ...6 2 TROUBLE SHOOTING GUIDE 6 2 1 No Display or display is unstable Interface Board 53...
Page 54: ...6 2 2 BUTTON function Control Board 6 2 3 OSD function 54...
Page 55: ...6 2 4 No power troubleshooting 55...
Page 59: ...59...