Samsung LXB530, LXB550, LXB350 Troubleshooting
6 Troubleshooting
Notes: 1. Before troubleshooting, setup the PC’s display as below.
•Resolution: 1024 x 768
•H-frequency: 48 kHz
•V-frequency: 60 Hz
2.If no picture appears, make sure the power cord is correctly connected.
3.Check the following circuits.
•No raster appears: Audio PCB, SMPS PCB, Main PCB (SyncMaster 330TFT/550TFT)
Stand PCB, Main PCB (SyncMaster 331TFT/531TFT)
•12V develop but no screen: Main PCB
•12V does not develop: Audio PCB, SMPS PCB (SyncMaster 330TFT/530TFT)
Main PCB (SyncMaster 331TFT/531TFT)
4.If you push and hold the “EXIT” button for more than 5 seconds, the monitor automatically turns back to the factory preset.
6-1 No Power
Does proper DC 12 V appear at DC jack connected to CN102?
Yes
Does proper DC 5 V appear at Pin 3 of IC109?
No
Check Stand PCB.
No
Check F101 and IC109.
Yes
Check IC401, RL101, D110 and Q101.
SyncMaster 33*TFT/53*TFT |
6-1 |
6 Troubleshooting
6-2 No Video
Power indicator is green
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No |
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7 |
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Does the H-sync pulse |
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at Pin 94 of IC101? |
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Yes |
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Yes |
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Replace IC101. |
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20 |
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1 |
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Does the sync pulses appear |
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Does the sync pulses appear at |
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Pins 13 and 14 of IC110? |
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Pins 2 and 3 of IC110? |
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No |
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No |
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Does the pulse appear at Pin 10 |
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of IC105 or Pin 1 of IC104?
Yes
Replace IC106.
Replace IC105 (seperate sync) or IC104 (SOG).
No
and IC101.
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Yes |
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Replace IC110 or check its |
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related circuit. |
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5 |
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10 |
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14 |
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No |
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Replace IC301 or check its |
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Do the sync pulses appear at Pins |
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related circuit. |
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2, 3, 54, 55 and 56 of IC301? |
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Yes |
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Replace IC305 or check its |
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related circuit. |
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6 |
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No |
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appear at |
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Do the waveforms |
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Pins 5 and 20 of CN301? |
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. |
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Yes
Replace LCD Panel
6-2 |
SyncMaster 33*TFT/53*TFT |
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