Text preview for : Troubleshooting.pdf part of Samsung monitor lcd samsung 540N_540B_740N_740B_740T_940B_940T_940N Monitor Lcd Samsung modelos:
540N
540B
740N
740B
740T
940B
940T
940N
Back to : monitor lcd samsung 540N_ | Home
4 Troubleshooting
4 Troubleshooting
' · · ·
· · · " "
4-1 No Power(LS15HAA/LS15HAB)
Yes When Pin 4 of CN600 is 0V does proper DC 13V, 5V appear at Pin 1, 2 and 6, 7 of CN600 separately? Yes When Pin 3 of IC602 is DC 5V does proper DC 3.3V appear at Pin 2 of IC602? Yes When pin1 of IC600 is DC 5V does proper DC3.3V appear at Pin3 of IC600? Yes Replace AD Board. No No No '
Change IP Board.
Check IC602 and related circuit.
Check IC600 and related circuit.
4-1
4 Troubleshooting
' · · ·
· · · " "
4-2 No Power(LS17HAA/LS17HAB/LS17HAT/LS19HAA/LS19HAT)
'
Yes * When Pin 4 of CN600 is 0V does proper DC 13V, 5V appear at Pin 1, 2 and 6, 7 of CN600 separately? Yes No
Change IP Board.
When Pin 4 of IC600 is DC 0.5V does proper DC 0.5V appear at Pin 5 and 6 of IC600? Yes When Pin 2, 3 of IC601 is DC 3.3V does proper DC 4.3V appear at Pin 1 of IC601? Yes When Pin 2, 3 of IC601 is DC 4.3V does proper DC 2.5V appear at Pin 4 of IC601?
No
Check IC600 and related circuit.
No
Check IC601 and related circuit.
No
Check IC601 and related circuit.
* 0V means power on state. When the monitor work well except DPMS and power switch off, 0V should be applied to number 4 of CN600.
4-2
4 Troubleshooting
4-3 No Video (ANALOG)
Check signal cable connection and power.
1
X400 oscillate properly?
No
Replace or check related circuit.
Yes Is there R, G, B input at R101, R103 and R105? Yes Is there Hsync, Vsync waveform
2 3
No
Check input part.
No
Check IC400 and related circuit.
at Pin 100, 1 of IC 400? Yes Is there Hsync, Vsync waveform
2 3
No
Check IC200 and related circuit.
at Pin 41, 42 of IC 200? Yes Does the output signal appear at Pin 17~20, 22~27 of CN400? Yes There are DC 5V at Pin 1, 2 and 3 of CN400? Yes Replace LCD Panel. No Check PANEL_EN SIGNAL at R236 is High(On:High) and BL_EN signal at R605(ON:Low) is Low No
Check IC400 and related circuit.
4-3
4 Troubleshooting
WAVEFORMS 1 2
3
16V 100nF C402
C414 100nF 16V MO
XREF
+3.3V_MAIN
C416 18pF 50V NULL MO
24.0MHz
SCALER_RESET
X400
AD0 AD3
XREF XREF XREF
NULL MO
C418 18pF 50V
RGND
4C-49/SM5H,24MHZ,16PF
+3.3V_MAIN
2 3
AVDD_DVI
VSYNC0 GND
1
81 BUSTYPE 82 NC 83 NC 84 NC 85 NC 86 VDDC 87 GND 88 GND 89 VDDP 90 NC 91 NC 92 AD0 93 AD3 94 HWRESET 95 XIN 96 XOUT 97 AVDD_MPLL 98 GND 99 HSYNC0 100
BYPASS
R+
G+
G-
C423 100nF 16V
C417 100nF 16V MO
C415 100nF 16V
4-4
1 2 3 4 5 6 7 8 9 10 11
B+ B-
LVB2P LVBCKM
LVB0P
LVB1M
GND LVB0M
LVB2M
C403 100nF 16V
C405 100nF 16V
C406 100nF 16V
C404 100nF 16V
LVB1P
GND VDDP
80 79 78 77 76 75 74 73 72 71 70
4 Troubleshooting
4-4 No Video (DIGITAL)
Check signal cable connection and power.
1
X400 oscillate properly?
No
Replace or check related circuit.
Yes Is there R, G, B input at
4 5 6
No
Check input part.
R110, R112, R114, R111, R113 and R115? Yes Is there waveform
7
No
Check input part.
at R11, R117? Yes Does the output signal appear at Pin 17~20, 22~27 of CN400? Yes There are DC 5V at Pin 1, 2 and 3 of CN400? Yes Replace LCD Panel. No Check the panel EN signal at R222 and BLEL signal at R603. No
Check IC400 and related circuit.
4-5
4 Troubleshooting
WAVEFORMS 1 2
3
4
5
6
7
4-6
MAIN
C108 100nF 16V
C124
330nF 16V
B
2 1 2 1 2 1 2 1 2 1 2 1 2 1 2
A B B B B A B B B A
A
A
A
A
C C C
3 3
C C
3
C D105 D103
3 3
C
C
D106
D107
D114 MMBD4148SE
D113 MMBD4148SE
D100 MMBD4148SE
MMBD4148SE
MMBD4148SE
MMBD4148SE
MMBD4148SE
D109
3 3 XREF XREF XREF XREF XREF XREF XREF XREF
3
4 5 6 7
R116 R117 R118 R119 R120 R121 R122 R123
22ohm 22ohm 22ohm 22ohm 22ohm 22ohm 22ohm 22ohm
1/10W 1/10W 1/10W 1/10W 1/10W 1/10W 1/10W 1/10W
RX2RX1RX0RX2+ RX1+ RX0+ RXC+ RXC-
XREF
SCL_DDC_D
XREF XREF
SDA_DDC_D CHK_DVI
+5V_DDC_D
C3 4 A2 5 C4 6 1 C1 2 A1 3
R125 1K 1/16W
C2
ZD102 MMQA5V6T3
HSYNC_IN_A VSYNC_IN_A
XREF
XREF
XREF
RX2+ RX2RX1+ RX1-
XREF
XREF XREF
+5V_DDC_D
XREF
RX0+ RX0UDZS5.6B-T ZD1 2 B RXC+ RXC
XREF
XREF XREF
4 Troubleshooting
4-7
4 Troubleshooting
Memo
4-8