Sharp 910N - Manual (Page 15)

MJ15AS*/MJ17AS*/MJ19AS*/
MJ15BS*/MJ17BS*/MJ19BS* 5-1
5 Troubleshooting
Notes: 1. Before troubleshooting, setup the PC’s display as below.
• Resolution: 1024 x 768
• H-frequency: 61 kHz
• V-frequency: 75 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/D PBA
• 5V develop but no screen: Main PBA
• 5V does not develop: I/D PBA
4. If you push and hold the “ (Enter, Source)” button for more than 5 seconds, the monitor automatically returns
to the factory preset.
5-1-1 No Power (MJ15A*/MJ15B*)
When Pin 4 of CN600 is 0V
does proper DC 13V, 5V
appear at Pin 1, 2 and 6, 7 of
CN600 separately?
Change IP Board.
Check Function Ass’y.
Yes
Yes
No
When Pin 3 of IC602 is DC 5V
does proper DC 3.3V appear at
Pin 4 of IC602?
Check IC602 and related circuit.
Yes
No
When Pin 4 of IC600 is DC 5V
does proper DC 3.3V appear at
Pin 5 and 6 of IC600?
Check IC600 and related circuit.
No
Yes
When Pin 2, 3 of IC601 is
DC 3.3V does proper DC 4.3V
appear at Pin 1 of IC601?
Check IC601 and related circuit.
No
Yes
When Pin 2, 3 of IC601 is
DC 4.3V does proper DC 2.5V
appear at Pin 4 of IC601?
Check IC601 and related circuit.
No
❇
* 0V means power on state.
When the monitor work well except DPMS and power switch off,
0V should be applied to number 4 of CN600.