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4 Troubleshooting
Notes: 1. Before troubleshooting, setup the PC's display as below. · Resolution: 1024 x 768 · H-frequency: 48 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 · 12V develop but no screen: Main PCB · 12V does not develop: Main PCB 4. If you push and hold the Minus() button for more than 5 seconds, the monitor automatically turns back to the factory preset.
4-1 No Power
Does proper DC 12V appear at DC jack connected to CN102? Yes Does proper DC 5V, DC 3.3V appear at Pin 4 of IC101and IC102? Yes Does proper DC 3.3V, DC 2.5V appear at Pin 3 of IC103, IC106 and IC104? Yes Does proper 3.3V-Signal appear at IC111? (Panel-pwron, Lvds-pwron) Yes Check Q101 and Q102.
No
Check Power Adaptor.
No
Check IC101, IC102 and related circuit.
No
Check IC103, IC106, IC104, and related circuit.
No
Check IC111 and related circuit.
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4-1
4 Troubleshooting
4-2 No Video [Analog]
Check signal cable and connection. Does the video signal appear at the Pin 48, 47, 46, 45, 42, 41, 40, 39, 38, and 37of IC401? 5 9 8 7 6 Yes Is (BKLT_EN) of R111 High? No Check IC301 and related circuit. No Does the input signal appear at Pin 27, 28, 30, and 31 1 of IC401 (DHS,DVS,DEN,DCLK) ? 4 3 2 No Does the analog video signal appear at R200, R201, R202? (RED, GREEN, BLUE) Yes Does the sync signal appear at Pin 4 of IC510 and R211?
10 11
Yes
Check TFT-LCD panel and Inverter.
Yes
Replace IC401.
No
Check PC Signal.
No
(A_H*V_SYNC, A_V_SYNC) Yes During power on-off, does the input signal appear at the R322, R323, the Pin 1, 3, 5, and 7 of RA313? (HCLK,HFS,HDATA(0),HDATA(1),HDATA(2),HDATA(3)) Yes Does the video signal appear at the output port? No No
Check IC509, IC510 and related circuit. Check PC Signal.
Check IC503 and related circuit.
Check IC301 and related circuit.
4-2
1503FP
4 Troubleshooting
4-2-1 No Video [Digital]
Check signal cable and connection. Does the video signal appear at the Pin 48, 47, 46, 45, 42, 41, 40, 39, 38, and 37of IC401? 6 9 8 7 5 Yes Is (BKLT_EN) of R111 High? No Check IC301 and related circuit. No Does the input signal appear at Pin 27, 28, 30, and 31 1 of IC401 (DHS,DVS,DEN,DCLK) ? 4 3 2
12
Yes
Check TFT-LCD panel and Inverter.
Yes
Replace IC401.
Does the signals appear at R301, R302,
13 14 15
No
Check PC Signal.
R303,R304, R305, R306, R307, and R308? Yes During power on-off, does the input signal appear at the R322, R323, the Pin 1, 3, 5, and 7 of RA313? (HCLK,HFS,HDATA(0),HDATA(1),HDATA(2),HDATA(3)) Yes Does the video signal appear at the output port? No Check IC301 and related circuit. No Check IC503 and related circuit.
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4 Troubleshooting
WAVEFORMS
1 IC401 #31 2 IC401 #30 3 IC401 #28 4 IC401 #27 5 IC401 #37, 38
6 IC401 #39, 40
7 IC401 #41, 42
8 IC401 #45, 46
9 IC401 #47, 48
10 IC510 #4
11 R211
12 R301, R302
13 R303, R304
14 R305, R306
15 R307, R308
4-4
1503FP