Samsung ST436WMX/GAP Service Manual page 45

Flcd projection television l54a chassis
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6. Vertical Line Failure (twenty vertical lines fail)
-> When twenty vertical lines appear on screen, check each connector is properly connected.
If the vertical lines appear after calibration, it is judged as 'Failure.'
* Magenta line: Green connector (pin 100)
* Yellow line: Blue connector (pin 100)
* Cyan line: Red connector (pin 100)
7. Temperature Data Output
-> Check PWM is output. (The PWM output applies to the temperature data that is displayed on screen.)
-> Check Points: Check the output from OTP02 IC(AT89C52) pins 21(R), 22(G),23(B).
-> Table of Temperature
Temp.(°C)
less than 5
5
10
15
20
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
Samsung Electronics
PWM (uS)
Panel Frequency (Hz)
100
less than 2,560
120~139
2,560
140~159
3,390
160~179
4,100
180~199
4,800
200~219
5,400
220~239
5,508
240~259
5,616
260~279
5,724
280~299
5,832
300~319
5,940
320~339
6,038
340~359
6,136
360~379
6,234
380~399
6,332
400~419
6,430
420~439
6,520
440~459
6,610
460~479
6,705
480~499
6,800
500~519
6,880
Temp.(°C)
PWM (uS)
41
520~539
42
540~559
43
560~579
44
580~599
45
600~619
46
620~639
47
640~659
48
660~679
49
680~699
50
700~719
51
720~739
52
740~759
53
760~779
54
780~799
55
800~819
56
820~839
57
840~859
58
860~879
59
880~899
60
900
Troubleshooting
Panel Frequency (Hz)
6,960
7,050
7,130
7,210
7,290
7,362
7,434
7,506
7,578
7,650
7,718
7,786
7,854
7,922
7,990
8,052
8,114
8,176
8,238
over 8,300
6-11

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