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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*)
Yes When Pin 4 of CN600 is 0V does proper DC 13V, 5V appear at Pin 1, 2 and 6, 7 of CN600 separately? Yes When Pin 3 of IC602 is DC 5V does proper DC 3.3V appear at Pin 4 of IC602? Yes When Pin 4 of IC600 is DC 5V does proper DC 3.3V appear at Pin 5 and 6 of IC600? Yes When Pin 2, 3 of IC601 is DC 3.3V does proper DC 4.3V appear at Pin 1 of IC601? Yes When Pin 2, 3 of IC601 is DC 4.3V does proper DC 2.5V appear at Pin 4 of IC601? No No No No
Check Function Ass'y.
No
Change IP Board.
Check IC602 and related circuit.
Check IC600 and related circuit.
Check IC601 and related circuit.
Check IC601 and related circuit.
* 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. MJ15AS*/MJ17AS*/MJ19AS*/ MJ15BS*/MJ17BS*/MJ19BS* 5-1
5 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: 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 " (Enter/Source)" button for more than 5 seconds, the monitor automatically returns to the factory preset.
5-1-2 No Power (MJ17A*/MJ19A*/MJ17B*/MJ19B*)
Yes When Pin 4 of CN600 is 0V does proper DC 13V, 5V appear at Pin 1, 2 and 6, 7 of CN600 separately? Yes When Pin 4 of IC600 is DC 0.5V does proper DC 0.5V appear at Pin 5 and 6 of IC600? Yes When Pin 2, 3 of IC601 is DC 3.3V does proper DC 4.3V appear at Pin 1 of IC601? Yes When Pin 2, 3 of IC601 is DC 4.3V does proper DC 2.5V appear at Pin 4 of IC601? No No No
Check Function Ass'y.
No
Change IP Board.
Check IC600 and related circuit.
Check IC601 and related circuit.
Check IC601 and related circuit.
* 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.
5-2
MJ15AS*/MJ17AS*/MJ19AS*/ MJ15BS*/MJ17BS*/MJ19BS*
5 Troubleshooting
5-2-1 No Video (ANALOG)
Check signal cable connection and power.
No
1
X400 oscillate properly?
Replace or check related circuit.
Yes Is there R, G, B input at R100, R101 and R103? Yes Is there Hsync, Vsync waveform
2 3
No
Check input part.
No
Check IC400 and related circuit.
at Pin 100, 1 of IC 400? Yes Is there Hsync, Vsync waveform
2 3
No
Check IC200 and related circuit.
at Pin 43, 44 of IC 200? Yes Does the output signal appear at Pin 17~20, 22~27 of CN400? Yes There are DC 5V at Pin 1, 2 and 3 of CN400? Yes Replace LCD Panel. No Check the panel EN signal at R222 and BL_EL signal at R603. No
Check IC400 and related circuit.
MJ15AS*/MJ17AS*/MJ19AS*/ MJ15BS*/MJ17BS*/MJ19BS*
5-3
5 Troubleshooting
WAVEFORMS 1 2
3
5-4
MJ15AS*/MJ17AS*/MJ19AS*/ MJ15BS*/MJ17BS*/MJ19BS*
5 Troubleshooting
5-2-2 No Video (DIGITAL)
Check signal cable connection and power.
No
1
X400 oscillate properly?
Replace or check related circuit.
Yes Is there R, G, B input at
4 5 6
No
Check input part.
R110, R112, R114, R111, R113 and R115? Yes Is there waveform
7
No
Check input part.
at R11, R117? Yes Does the output signal appear at Pin 17~20, 22~27 of CN400? Yes There are DC 5V at Pin 1, 2 and 3 of CN400? Yes Replace LCD Panel. No Check the panel EN signal at R222 and BLEL signal at R603. No
Check IC400 and related circuit.
MJ15AS*/MJ17AS*/MJ19AS*/ MJ15BS*/MJ17BS*/MJ19BS*
5-5
5 Troubleshooting
WAVEFORMS 1 2
3
4
5
6
7
5-6
MJ15AS*/MJ17AS*/MJ19AS*/ MJ15BS*/MJ17BS*/MJ19BS*