Troubleshooting; No Power - Samsung 740NW Service Manual

4 Troubleshooting

Notes: 1. Before troubleshooting, setup the PC 's display as below.
• Resolution: 1280 x 720
• H-frequency: 45 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: Function PBA, Main PBA, I/P PBA
• 5V develop but no screen: Main PBA
• 5V does not develop: I/P PBA
4. If you push and hold the "
automatically returns to the factory preset.

4-1 No Power

1
When pin 4 of CN600 is 0V, is
DC 14V measured on pin 2,
DC 14V on pin 6, and DC 5V
on pin 7?
Yes
4
When pin 1 of IC600 is DC 5V, is
DC 3.3V measured on pin 3?
Yes
6
When pin 3 of IC602 is DC 3.3V, is
DC 1.8V measured on pin 2?
* All locations of this page includes Main PBA.
(Enter/Source)" button for more than 5 seconds, the monitor
Yes
No
2
3
No
5
No
7
Check the connections of the
Function Ass'y
Replace the IP board.
Check IC600 and its related
circuits.
Check IC602 and its related
circuits.
4 Troubleshooting
4-1