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/Auto)” button for more than 5 seconds, the monitor automatically returns
to the factory preset.
5-1 No Power
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?
❇
Yes
Check Function Ass’y.
No
Change IP Board.
No
Check IC600 and related circuit.
No
Check IC601 and related circuit.
No
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.
GS17CS 5-1
5 Troubleshooting
5-2 No Audio
Check Stereo Cable.
When Pin 2 of IC600 is DC 5V
does proper DC 13V appear at
Pin 7, 8 of IC600?
Yes
When Pin 1 of IC502 is DC 13V
does proper DC 6V appear at
Pin 3 of IC502?
Yes
Does the signal appear at
Pin 4, 6 of IC500?
Yes
Does the signal appear at
Pin 9, 12, 13, and 16 of IC500?
Yes
No
Check IC600 and related circuit.
No
Check IC502 and related circuit.
No
Check Audio PBA and Sound Source.
No
Check IC500 and related circuit.
Check Specker and Audio Ass’y.
5-2 GS17CS
5 Troubleshooting
5-3 No Video
Check signal cable connection and power.
1
X400 oscillate properly?
Yes
Is there R, G, B input at R100,
R101 and R103?
Yes
Is there Hsync, Vsync waveform
3
2
at Pin 100, 1 of IC 400?
Yes
WAVEFORMS
1
No
Replace or check related circuit.
2
No
Check input part.
No
Check IC400 and related circuit.
3
Is there Hsync, Vsync waveform
3
2
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
No
No
Check IC200 and related circuit.
Check IC400 and related circuit.
Check the panel EN signal at R222
and BL_EL signal at R603.
GS17CS 5-3
5 Troubleshooting
Memo
5-4 GS17CS
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