Samsung GH19PS Troubleshooting
4 Troubleshooting
4-1 Troubleshooting
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
• 14V develop but no screen: Main PCB
• 14V 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
CONFIDENTIAL
Does proper DC 14V appear at
DC jack and Pin 1, 2 of CN403 ?
Yes
Does proper DC 5V appear at Pin 4
of IC101, at Pin 5, 6, 7, 8 of IC515 and
DC 3.3V appear at Pin 4 of IC102?
Yes
Does proper DC 3.3V appear at
Pin 2 of IC510 and DC 2.5V
appear at Pin 3 of IC104?
Yes
Does proper DC 3.3V appear at
Pin 1, 9, 26 of IC401, 402 and 0V
appear at Pin 22 (*DPMS-ON), 36
(*PANEL-EN) of IC521?
Yes
No
No
No
No
Check signal cable and
power adaptor.
Check IC101, IC515, IC102
and related circuit.
Check IC510, IC104 and
related circuit.
Check IC401, IC521 and
related circuit.
Check IC521.
GH19P* 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 37 of
9 8 7 6
IC401 and IC402?
Yes
CONFIDENTIAL
5
No
Is collector (BKLT-EN) of Q108 High?
No
Check IC301 and related circuit.
Does the input signal appear at Pin 27, 28, 30, and 31
of IC401 and IC402
Does the analog video signal appear at
R718, R717, R716? (RED, GREEN, BLUE)
(DHS,DVS,DEN,DCLK)
No
Yes
Does the sync signal appear
at Pin 4 of R582 and R211?
10 11
(A_H*V_SYNC, A_V_SYNC)
Yes
4 3 2
?
1
Yes
Check TFT-LCD panel and Inverter.
Yes
No
No
Replace IC401 or IC402.
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?
(HCLK,HFS,HDATA(0),HDATA(1),HDATA(2),HDATA(3))
Yes
Does the video signal
appear at the output port?
4-2 GH19P*
No
Check IC521 and related circuit.
No
Check IC301 and related circuit.
Loading...