Samsung MO15E Schematic
CONFIDENTIAL
MO15E* 4-1
4 Troubleshooting
Notes: 1. Before troubleshooting, setup the PC’s display as below.
• Resolution: 1024 x 768
• H-frequency: 48 kHz
• V-frequency: 60 Hz
2. If no picture appears, make sure the power cord is correctly connected.
3. Check the following circuits.
• No raster appears: SMPS PCB, Main PCB
• 14V develop but no screen: Main PCB
• 14V does not develop: SMPS PCB
4. If you push and hold the “EXIT” button for more than 5 seconds, the monitor automatically turns back
to the factory preset.
4-1 No Power
Does proper DC 14 V appear at
Pin 1, 2 or Pin 3 of CN202?
Check SMPS.
Yes
No
Does proper DC 3.3 V appear at
Pin 4 of IC100?
Check IC100.
Check IC101, IC301, IC500 or IC602.
Yes
No
Does the pulse appear
at Pin 8 of IC501?
CONFIDENTIAL
4 Troubleshooting
4-2 MO15E*
4-2 No Video
Power indicator is green.
Replace X501 or
check its related circuit.
No
Does the clock pulse
appear at Pin 78 of IC300?
Does the H-sync
pulse appear at
Pin 38, 39 of IC300?
Check R304, 305, 306 and 307.
Replace IC401 or check
its related circuit.
No
Do the sync pulses appear at Pin
27, 28, 30 and 31 of IC401?
Yes
Yes
No
No
Yes
Yes
Replace X301 or
check its related circuit.
No
No
1 2
Does the clock pulse
appear at Pin 73 of IC300?
9
12 8
Do the pulses appear
at Pin 43, 44 of IC501?
Replace IC202(SOG) or check R207
and Pin 13, 15, 17, 19 of CN202.
10
13 14 15
1 3 4 5
11
Do the waveforms
appear at Pins 39
and 40 of IC401?
Replace LCD Panel.
Yes
Replace IC300.
Yes
No
Replace IC501 or
check its related circuit.
Yes
6 7
4 Troubleshooting
MO15E* 4-3
CONFIDENTIAL
1 2 3 4
5 6 7 8
9 10 11 12
13 14 15
WAVEFORMS
4 Troubleshooting
4-4 MO15E*
CONFIDENTIAL
4-3 No OSD
There is video but no OSD.
While pushing a front control
button, does any pulse appear
at Pin 16, 17 of IC501?
Press exit key for more than 5
seconds to do the factory preset.
No
Do the pulses appear at Pin2
and Pin3 of CN600 while
pushing a front control button?
Replace IC300 and
check its related circuit.
Yes
Yes
Replace IC501 or check its
related circuit.
Replace the key function PBA.
No
CONFIDENTIAL
MO15E* 6-1
- BN94-00302A ASSY PCB MAIN MO15ES SNA
CIS BH73-60304E RUBBER-SUPPORT MO15PS,CR V0,6*6*6.4,BLACK SNA
CIS BN39-00002A CBF-HARNESS -,60,BLU/WHT,-,26,- SNA
CIS BN39-00251A LEAD CONNECTOR ASSY
MO15ES,UL1571#30,UL/CSA,20P,#30,12507HS-20,12507HS-20,BK,40MM,1571#30,SJ01-01-33
CIS BN44-00066A INVERTER MO15PS,SIC581,48KHZ,14VDC,2.6MARMS,6.1MARMS,48KHZ,140*50*8.0,4LAMP
CIS BN70-00264A PLATE-BRKT GROUND MO15PS,SECC,-,T0.8,-,-,-,-,MO15PS SNA
CIS BN72-00307A PLATE-PCB MO15PS,ABS+PC,IV16,-,-,5V,-,-,- SNA
CIS6 BN63-00265A GASKET
MO15PS,CONDUCTIVE FABLIC,4MM,10MM,17MM,GRAY,71TSSK 10-4-17-13,71TSSK 10-4-17-13
SNA
CIS7 BN63-00266A GASKET
MO15PS,CONDUCTIVE FABLIC,4MM,4MM,60MM,GRAY,71TTSK 4-4-60-13,71TTSK 4-4-60-13
SNA
SH/MO+BR/GR+PCB
6001-001340 SCREW-MACHINE CH,+,M2.0,L4.5,ZPC(YEL),SWRCH18A,FP
- BN97-00094A ASSY SMD MO15ES SNA
C100 2402-001042 C-AL,SMD 100uF,20%,16V,GP,TP,6.6x6.6x5.4mm
C101 2203-005005 C-CERAMIC,CHIP 100nF,10%,16V,X7R,TP,1608
C102 2402-001042 C-AL,SMD 100uF,20%,16V,GP,TP,6.6x6.6x5.4mm
C103 2402-001042 C-AL,SMD 100uF,20%,16V,GP,TP,6.6x6.6x5.4mm
C104 2203-005005 C-CERAMIC,CHIP 100nF,10%,16V,X7R,TP,1608
C105 2203-001652 C-CERAMIC,CHIP 470nF,+80-20%,16V,Y5V,TP,1608
C106 2203-001652 C-CERAMIC,CHIP 470nF,+80-20%,16V,Y5V,TP,1608
C107 2402-001042 C-AL,SMD 100uF,20%,16V,GP,TP,6.6x6.6x5.4mm
C200 2402-001042 C-AL,SMD 100uF,20%,16V,GP,TP,6.6x6.6x5.4mm
C201 2203-000189 C-CERAMIC,CHIP 100nF,+80-20%,25V,Y5V,TP,1608,
C202 2203-000236 C-CERAMIC,CHIP 0.1nF,5%,50V,NP0,TP,1608
C203 2203-000236 C-CERAMIC,CHIP 0.1nF,5%,50V,NP0,TP,1608
C204 2203-005005 C-CERAMIC,CHIP 100nF,10%,16V,X7R,TP,1608
C205 2203-000815 C-CERAMIC,CHIP 0.033nF,5%,50V,NP0,TP,1608
C206 2203-000626 C-CERAMIC,CHIP 0.022nF,5%,50V,NP0,TP,1608
C208 2203-005005 C-CERAMIC,CHIP 100nF,10%,16V,X7R,TP,1608
C210 2203-005005 C-CERAMIC,CHIP 100nF,10%,16V,X7R,TP,1608
C212 2203-005005 C-CERAMIC,CHIP 100nF,10%,16V,X7R,TP,1608
C213 2203-000384 C-CERAMIC,CHIP 0.015nF,5%,50V,NP0,TP,1608
C214 2203-000384 C-CERAMIC,CHIP 0.015nF,5%,50V,NP0,TP,1608
C215 2203-000384 C-CERAMIC,CHIP 0.015nF,5%,50V,NP0,TP,1608
C216 2203-005005 C-CERAMIC,CHIP 100nF,10%,16V,X7R,TP,1608
C217 2402-000108 C-AL,SMD 10uF,20%,16V,WT,TP,4.3x4.3x5.4
C218 2203-005005 C-CERAMIC,CHIP 100nF,10%,16V,X7R,TP,1608
C219 2203-000257 C-CERAMIC,CHIP 10nF,10%,50V,X7R,TP,1608
C220 2402-000108 C-AL,SMD 10uF,20%,16V,WT,TP,4.3x4.3x5.4
C300 2402-000135 C-AL,SMD 22uF,20%,16V,GP,TP,5.3x5.3x5.4
C301 2203-005005 C-CERAMIC,CHIP 100nF,10%,16V,X7R,TP,1608
C302 2203-005005 C-CERAMIC,CHIP 100nF,10%,16V,X7R,TP,1608
C303 2203-005005 C-CERAMIC,CHIP 100nF,10%,16V,X7R,TP,1608
C304 2203-005005 C-CERAMIC,CHIP 100nF,10%,16V,X7R,TP,1608
C305 2402-000135 C-AL,SMD 22uF,20%,16V,GP,TP,5.3x5.3x5.4
C306 2203-005005 C-CERAMIC,CHIP 100nF,10%,16V,X7R,TP,1608
C307 2402-000135 C-AL,SMD 22uF,20%,16V,GP,TP,5.3x5.3x5.4
C308 2203-005005 C-CERAMIC,CHIP 100nF,10%,16V,X7R,TP,1608
C309 2203-000041 C-CERAMIC,CHIP 0.01nF,0.25pF,50V,NP0,TP,1608
C310 2203-000843 C-CERAMIC,CHIP 39nF,10%,25V,X7R,TP,1608,-
Loc. No. Code No. Description Specification Remarks
6 Electrical Parts List
6-1 Main PCB Parts
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