Service Manuals, User Guides, Schematic Diagrams or docs for : Samsung Monitor Monitor T23A950 04_trobleshooting
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4. Troubleshooting
4. Troubleshooting
4-1. First Checklist for Troubleshooting
Self-Test Feature Check
Your monitor provides a self test feature that allows you to check whether your monitor is functioning properly.
1. Turn off both your computer and the monitor.
2. Unplug the video cable from the back of the computer
3. Turn on the monitor.
If the monitor is functioning properly, you will see a box in the illustration below.
This box appears during normal operation if the video cable becomes disconnected or damaged
4. Turn off your monitor and reconnect the video cable; then turn on both your computer and the monitor.
If your monitor screen remains blank after using the previous procedure, check your video controller and computer
system; your monitor is functioning properly.
Warning Messages
If there is something wrong with the input signal, a message appears on the screen or the screen goes blank although
the power indicator LED is still on. The message may indicate that the monitor is out of scan range or that you need to
check the signal cable.
Environment
The location and the position of the monitor may influence the quality and other features of the monitor.
If there are any sub woofer speakers near the monitor, unplug and relocate the woofer to another room.
Remove all electronic devices such as radios, fans, clocks and telephones that are within 3 feet (one meter) of the
monitor.
Useful Tips
A monitor recreates visual signals received from the computer.
Therefore, if there is trouble with the computer or the video card, this can cause the monitor to become blank,
have poor coloring, noise, Video mode not supported, etc. In this case, first check the source of the problem,
and then contact the Service Center or your dealer.
Judging the monitor's working condition
If there is no image on the screen or a "Not Optimum Mode", "Recommended Mode 1920 X 1080 60Hz" message
comes up, disconnect the cable from the computer while the monitor is still powered on.
- If there is a message coming up on the screen or if the screen goes white, this means the monitor is in working
condition.
- In this case, check the computer for trouble.
4-1
4. Troubleshooting
4-2. No Power
- The LED on the front panel of the monitor does not work when the power is connected and the
Symptom
Power button is pressed.
- Check if the Power switch on the rear panel of the monitor has been turned on.
Major - Check the SMPS fuse and output power of power adapter.
checkpoints - Check the power part of the Main Board and check if a similar symptom appears at another
output terminal.
IC201 IC207
IC2001
IC204
(Bottom side)
IC206
IC2010
(Bottom side)
IC202
IC1030
(Bottom side)
CN201
Does proper 14V appear at pin No
Check DC Power Adapter
Diagnostics No.1 of CN201? 1
Yes
Does proper 14V appear at
BD1020? 1 No Check related circuit of IC1030,
Does proper 5V appear at IC2001 and IC2010.
BD237, BD240? 2
Yes
Does proper 3.3V, 1.5V and 1.2V No
appear at pin BD235 ,BD216, Check related circuit of IC204,
BD220 and BD226? 3 4 IC201, IC206 and IC202.
Yes
Does proper 1.1V appear at No
Check related circuit of IC207.
BD221? 5
Yes
Change main board for
Scaler(IC1001) problem
Caution Make sure Power connection before checking the Main Board.
4-2
4. Troubleshooting
4-2-1. Circuit diagrams when the power does not turn on
4-3
4. Troubleshooting
4-4
4. Troubleshooting
4-5
4. Troubleshooting
4-6
4. Troubleshooting
4-2-2. Waveforms
1 2
3 4
5
4-7
4. Troubleshooting
4-3. HDMI No Screen
Symptom - The LED power turns on but the screen is blank when the HDMI cable is connected.
- Check the HDMI cable connections.
Major
- Check whether the LVDS cable is connected correctly to the panel.
checkpoints
- Check the circuit related HDMI input and scaler operation.
IC1001
CN2100
IC601
CN201 CN604 CN602
Diagnostics Does Function LED persists white No Power adapter
light after power on?
Yes
Dose proper 5V appear at pin No. No Check HDMI cable connection
18 of CN604 or CN602?
Yes
Does proper signals appear at pin No
No.91(SDA) 6 and No.92(SCL)7 Change IC601.
of IC601?
Yes
Does proper clock signals No Change main board
appear at pin NO.11,12, 23, 24 because of scaler problem
of CN604 or CN602? 8,9
Yes
Check connection between main
board and panel.
Change Panel.
Caution Make sure Power connection before checking the Main Board.
4-8
HDMI1_5V
DDC_5V_VCC C617
100NF
10V
6G5> HDMI1_HPD
D613
6.2
DGND DGND
47KOHM
4.7KOHM
R624
R627
R689_DD
displayed on the monitor
TP 10OHM
SCL_DOWN
MMBD4148SE MMBD4148SE
TP604 10OHM
BZB84-C6V2
SDA_DOWN
DGND
R690_DD
CN602 A3.3V_PW
MGND3 MGND1
D601 D602
DGND
100 100
R621
19
R620
4.7KOHM
18 100OHM
17 20 RA602
HDMI1_IDENT
16 ADUC20S02010 1 2 6H5<
HDMI1_DDC_SDA
15 VT604 3 4 6H5<
HDMI1_DDC_SCL
14
22OHM
DGND
13
12 FT601
HDMI1_RXCLK- 6E2<
11 1 8 6E2<
EXC28CG900U HDMI1_RXCLK+
10 2 7
9 3 6 6E2<
HDMI1_RX0-
8 4 5 DEFAULT_RESISTOR_3300OHM_2_1 6E2<
HMR41-AK5200
HDMI1_RX0+
7
6 6E2<
HDMI1_RX1-
5 1 8 6E2<
EXC28CG900U HDMI1_RX1+
4 2 7
3 3 6 HDMI1_RX2- 6E2<
2 4 5 HDMI1_RX2+ 6E2<
1
FT602
MGND4 MGND2
HDMI INPUT 1
DGND DGND
HDMI_CEC
4-3-1. Circuit diagrams and waveforms (HDMI No Screen) when no screen is
4-9
4. Troubleshooting
A5V_PW HDMI2_5V
TPS2051BDBVR
4-10
IC622
5 OUT 1
IN
GND
R681
2
4 /OC 3
4.7KOHM
EN
C611
1/16W
D 1UF
10KOHM
R684
STK7002
G 10V
MHL_AON DGND
S
4. Troubleshooting
Q614
DGND
DGND
DDC_5V_VCC
1/16W
10KOHM
R683
C616
DGND A5V_PW
100NF
10V
4.7KOHM
47KOHM
IC621
OUT
R623
R626
1 5
IN
2 GND
DGND DGND
3 /OC 4
EN MHL_AON
C660
- DGND R669
TPS2051BDBVR
CN604 TP603 10UF 4.7KOHM
4.7UF
MMBD4148SE
C685
10V 1/16W
10V
MMBD4148SE
MGND1 MGND3 D615 D619
100 100
19
18 DGND
17 RA604 DGND
16 1 2 6G5<
HDMI2_DDC_SDA
15 3 4 6G5<
HDMI2_DDC_SCL
14
ARC2_SINGLE 22OHM
13
12 FT603 HDMI OPTICAL OUT
HDMI2_RXCLK- 6F2<
11 1 8 6F2<
HDMI2_RXCLK+
10 2 7
9 3 6 6G2<
HDMI2_RX0-
8 4 5 6G2<
HDMI2_RX0+
7
EXC28CG900U FT604
6 6G2<
HMR41-AK5200
HDMI2_RX1-
5 1 8 6G2<
HDMI2_RX1+
4 2 7
3 3 6 6G2<
HDMI2_RX2-
2 4 5 6G2<
MHL_AON HDMI2_RX2+
1 EXC28CG900U
Q610
MGND2 MGND4
D
S
HDMI2_HPD 1/16W B14V_PW
G
R698 18KOHM
AO5404E
1/16W
330KOHM
16V
820OHM R666
DEFAULT_RESISTOR_4700OHM_2_1
1/16W
D660 1/16W S
D
DGND
C691
Q670
R690
47KOHM Q613
47NF
R667 STK7002 G MHL_AON
G
D
DGND DGND DGND S
BAT721C DGND
R665
40
47KOHM
1/16W
2KOHM
1/16W
R652
DGND HDMI2_5V
HDMI INPUT 2
C3.3V_PW
C604 HDMI_RXCLK-
100NF
HDMI_RXCLK+
10V HDMI_RX0-
HDMI_RX0+
HDMI_RX1-
BD645
DGND HDMI_RX1+
HDMI_RX2-
HDMI_RX2+
C632
100NF
1/16W C623 C629 C625 C631 C633
10V
4.7KOHM
4.7KOHM
4.7KOHM
4.7KOHM
4.7KOHM
4.7KOHM
4.7KOHM
R679 100NF 100NF 1UF 100NF 100NF
4.7KOHM 10V 10V 10V 10V 10V
DGND
DGND
R680
R603
R604
R607
R608
R609
R610
128
127
126
125
124
123
122
121
120
119
118
117
116
115
114
113
112
111
110
109
108
107
106
105
104
103
102
101
100
99
98
97
DGND
C5V_PW
R0X2P
R0X2N
R0X1P
R0X1N
R0X0P
R0X0N
R0XCP
R0XCN
T0XCN
T0XCP
T1X0N
T1X0P
T0X1N
T0X1P
T0X2N
T0X2P
T1XCN
T1XCP
T1X0N
T1X0P
T1X1N
T1X1P
T1X2N
T1X2P
AVDD12
AVDD33
DVDD12
TPVDD12
TCVDD12
TX1DSCL
TX1DSDA
96
INT
95
TPWR_CI2CA
RSVDL
94
TX1_HPD R601
93 BD602
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