Samsung T220HD Service Manual page 25

4. Troubleshooting
4-4-1. Circuit diagrams and waveforms
displayed on the monitor
MGND5
MGND2
19
18
17
16
15
14
13
12 R3001
11
10 R3002
MGND3 9
R3003
8
7
R3004
6 R3005
5
4 R3006
3
R3007
2
1 R3008
20
21
MGND1
MGND4
CN3001
FGND
SIDE_HDMI_INPUT2
CN3004
MGND4 MGND2
18
19
17
16
15
14
12
13
11
10
9
8
6
7
5
4
3
2
MGND1 1
MGND5 MGND3
FGND
HDMI1_DDC_SDA
HDMI1_DDC_SCL
HDMI1_RXCLK-
HDMI1_RXCLK+
HDMI1_RX0-
HDMI1_RX0+
HDMI1_RX1-
HDMI1_RX1+
HDMI1_RX2-
HDMI1_RX2+
HDMI2_RXCLK-
HDMI2_RXCLK+
HDMI2_RX0-
4-8
HDMI_INPUT1
R3010
1 2
HDMI1_5V
0OHM 1/10W
FGND
R3009
2
1KOHM
0OHM 1/10W
1 2
1 2
0OHM 1/10W
1 2
0OHM 1/10W
0OHM 1/10W
1 2
0OHM 1/10W
1 2
1 2
0OHM 1/10W
1 2
0OHM 1/10W
1 2
0OHM 1/10W
FGND
R3202
1 2
HDMI2_5V
0OHM 1/10W
FGND
2
1KOHM
0OHM 1/10W
R3211 1 2
R3212 1 2
0OHM 1/10W
R3213 1 2
0OHM 1/10W
0OHM 1/10W
R3215 1 2
0OHM 1/10W
R3214 1 2
R3216 1 2
0OHM 1/10W
R3217 1 2
0OHM 1/10W
R3218 1 2
0OHM 1/10W
FGND
B3.3V_H
1 42
VDD CLK+
2 41
D0-A VDD
3 40
D0+A D0-
4 39
GND D0+
5 38
PI3HDMI201ZFE
D1-A GND
6 IC3250 37
D1+A D1-
7 36
VDD D1+
8 35
D2-A VDD
9 34
D2+A D2-
10 33
GND D2+
11 32
CLK-B GND
12 31
FGND
CLK+B OC_S0
13 30
VDD OC_S1
14 29
OC_S2
D0-B
FGND
(Digital-HDMI)
DDC_VCC
1
R3011
1 2
10OHM 1/10W
R3012
1 1 2
1/10W
4.7KOHM 1/10W
R3014
R3015
R3013
R3066
1 2
0OHM
DDC_VCC
2N7002
Q3200
1
R3205
1 2
10OHM 1/10W
R3207
1 1 2
1/10W
4.7KOHM 1/10W
R3206 R3208
R3209
R3210
A3.3V
1/10W
R3219
1 2
0OHM
1/10W
B3.3V_H
1/10W
1.5KOHM
1 2
R3251
B3.3V_H
FGND
FGND
D2_RXCLK+
SEL2_HDMI
OPTION
D2_RX0-
C
Q3201
D2_RX0+
B3.3V_H
E
D2_RX1-
D2_RX1+
D2_RX2-
D2_RX2+
FGND
FGND FGND FGND
B3.3V_H
OC_S2 OC_S1 OC_S0 V_SWING
0 0 0
FGND FGND
when no screen is
IC3001
8
VCC
7
MODE,/WC
R3016 1 2 6
47OHM 1/10W
SCL
1 2 5
R3017
47OHM 1/10W
SDA
FGND
IDENT_HDMI1
1 2
22OHM 1/10W
HDMI1_DDC_SDA
1 2
22OHM 1/10W HDMI1_DDC_SCL
1 2
HDMI1_HOT_PLUG
100OHM 1/10W
HDMI1_RXCLK-
HDMI1_RXCLK+
HDMI1_RX0-
HDMI1_RX0+
HDMI1_RX1-
HDMI1_RX1+
HDMI1_RX2-
HDMI1_RX2+
A3.3V
DDC_WP
AT24C02N-10SC
IC3003
8
VCC E0
7
E1
R3203
MODE,/WC
1 2 6
47OHM 1/10W
SCL E2
1 2 5
47OHM 1/10W
SDA VSS
FGND
R3204
IDENT_HDMI2
1 2
22OHM 1/10W
HDMI2_DDC_SDA
1 2
22OHM 1/10W
HDMI2_DDC_SCL
1 2
HDMI2_HOT_PLUG
100OHM 1/10W
HDMI2_RXCLK-
HDMI2_RXCLK+
HDMI2_RX0-
HDMI2_RX1-
HDMI2_RX0+
HDMI2_RX1+
HDMI2_RX2-
HDMI2_RX2+
SEL1_HDMI
R3253
2 2 1
B
1/10W 10KOHM
KTC3875S-Y
OE SEL1 SEL2 HPDA HPDB
0 1 X
HPD_SINK L
0 0 1 L
HPD_SINK
0 0 0 L L
DE_EMPHASIS
500 0
DDC_WP
AT24C02N-10SC
1
E0
2
E1
3
E2
4
VSS
FGND
1
2
3
4
FGND