Troubleshooting - Samsung 192T Service Manual

4 Troubleshooting

Notes: 1. Before troubleshooting, setup the PC's display as below.
• Resolution: 1280 x 1024
• H-frequency: 64 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: Stand PCB, Main PCB
• 14V develop but no screen: Main PCB
• 14V does not develop: Main PCB
4. If you push and hold exit for more than 5 seconds, the monitor automatically returus
to the factory preset.
4-1 No Power
Does proper DC 14V
appear at DC jack and
Pin 39, 40, 41 of CN202?
Yes
Does proper DC 5V, DC 3.3V
appear at Pin 2 of IC101,
and Pin 2 of IC103?
Yes
Does proper DC 2.5V
appear at Pin 3 of IC104?
Yes
Does proper 5.0V
appear at Pin 5, 6 of IC105 and
Pin 7, 8 of IC105? (Pin 2 (*OFF_SW)
and Pin 4 (*PANEL_EN) of IC105
must be low level)
Yes
Check IC301.
MO19P*/MO19E*
No
Check signal cable and
power adaptor and CN202.
No
Check IC101, IC103
and related circuit.
No
Check IC104
and related circuit.
No
Check IC105, IC203
and related circuit.
4-1