Samsung WS32Z30HEAXBWT, Руководство по обслуживанию, Страница: 111 / 216

Troubleshooting
Samsung Electronics 6-21
6-5-2 Troubleshooting Deflection Board
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Countermeasures by Deflection Types
1. The screen is blank and only the relay repeats close and open when turning the power on.
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This happens when the vertical voltage or vertical signal is not supplied, and because the Micom operates for 5 to 10
seconds and then turns the power off by force as it cannot detect the vertical signal..
2. CHECK POINT
- Check that the vertical output voltage is measured in the FBT terminal.
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VCC (+) : 19.5V ~ 20V
VCC (-) : Higher than 16.5V
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If you cannot measure the output voltage, check that the collector voltage of the horizontal TR is 1360V.
If the voltage is measured, the problem is a defect in the FBT unit.
(When you don't have an oscilloscope, and you can hear the high-voltage sound, you can determine that the horizontal TR
is normal.)
- Is the vertical input waveform output from the CXA2165 Chroma IC?
....... Input waveform: Approximately
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If the signal is not measured, check the CXA2165 VCC power voltage ====> 9V
3. Check that 15V is the proper output from the SMPS TRANS?
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Countermeasures against problems
1. The drooping of the top and bottom of the screen is too severe.
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This may happen when the N/S correction circuit is out of order.
2. CHECK POINT
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Measure the terminal V2 of the Vertical DY and check that the N/S correction signal is properly supplied.
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70Vpp.
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If the correction signal is not measured, check that the Lead of L304 (N/S TRANS) is disconnected. If L304 is normal, check
the soldering status of C305 and C439.
The correction signal is approximately 70Vpp.