Samsung GH17PS Troubleshooting
4-1 Troubleshooting (GH17P*)
Notes: 1. Before troubleshooting, setup the PC’s display as below.
• Resolution: 1280 x 1024
• H-frequency: 63 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: 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.
4-1-1 No Power
Does proper DC 14V appear at
DC jack and Pin 1, 2 of CN505 ?
Yes
Does proper DC 5V, DC 3.3V
appear at Pin 3 of IC101,
IC529 and Pin IC102?
Yes
Does proper DC 3.3V,
DC 2.5V appear at Pin 2 of
IC510 and Pin 3 of IC104?
Yes
Does proper 3.3V and 5.0V -Signal
appear at Pin 32 of IC401 and Pin 41 of
IC521? (Panel-pwron, Lvds-pwron)
Yes
Check IC503.
No
No
No
No
Check signal cable
and power apaptor.
Check IC101, IC529, IC102
and related circuit.
Check IC510, IC104,
and related circuit.
Check IC401, IC521
and related circuit.
GH17P*/GH18P* 4-1
4 Troubleshooting
4-1-2 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 37 of
9 8 7 6
IC401 and IC402?
Yes
5
No
Is collector (BKLT-EN) of Q102 High?
No
Check IC301 and related circuit.
Does the input signal appear at Pin 27, 28, 30, and 31
of IC401 and IC402
(DHS,DVS,DEN,DCLK)
4 3 2
?
1
No
Does the analog video signal appear at
R200, R201, R202? (RED, GREEN, BLUE)
Yes
Does the sync signal appear
at Pin 4 of R582 and R211?
10 11
(A_H*V_SYNC, A_V_SYNC)
Yes
Yes
Check TFT-LCD panel and Inverter.
Yes
Replace IC401 or IC402.
No
No
Check PC Signal.
Check R582, R211
and related circuit.
Check PC Signal.
During power on-off, does the input signal appear
at Pin 14, 15, 17, 18, 20, 21 of IC521?
No
Check IC521 and related circuit.
(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.
4-2 GH17P*/GH18P*
4-1-3 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?
9 8 7
Yes
4 Troubleshooting
6
5
No
Is collector (BKLT-EN) of Q102 High?
No
Check IC301 and related circuit.
Does the input signal appear at Pin 27, 28, 30, and 31
of IC401 and IC402
(DHS,DVS,DEN,DCLK)
?
12
4 3 2
1
Does the signals appear at R301, R302,
151413
R303,R304, R305, R306, R307, and R308?
Yes
During power on-off, does the input signal appear
at Pin 14, 15, 17, 18, 20, 21 of IC521?
(HCLK,HFS,HDATA(0),HDATA(1),HDATA(2),HDATA(3))
Yes
Does the video signal appear at the output port?
Yes
Check TFT-LCD panel and Inverter.
Yes
Replace IC401 and IC402.
No
Check PC Signal.
No
Check IC521 and related circuit.
No
Check IC301 and related circuit.
GH17P*/GH18P* 4-3
Loading...