Samsung 943NWX service manual When the Power Does Not Turn On

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4. Troubleshooting

4-2. When the Power Does Not Turn On

Symptom

- When turning on the Power button after connecting the power cable, the LED at the front of the

 

monitor does not operate.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

- When turning on the Power button after connecting the power cable, the LED at the front of the

 

 

monitor does not operate.

Major checkpoints

- Check the IP board power fuse and the IP board output power.

 

- Check the connections for the IP board and the Main board inside the monitor.

 

- Check the Main board power part and also check whether there is any abnormal output at any of

 

the other output terminals.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CN 600

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

IC 601

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

IC 602

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Yes

 

 

 

 

Check the connection status for

 

 

 

 

 

 

 

 

 

 

the function assy.

 

 

 

 

 

 

 

 

 

 

 

 

Is DC 5V measured at pins 5, 6 of the

No

 

 

CN600 connector when pins 3, 4 are

Replace the IP board.

 

0V?

 

 

 

 

 

 

 

 

Yes

 

 

 

 

 

 

 

 

 

IIs DC 3.3V measured at pin 3 of IC601

No

Check the circuits related to

Diagnostics

 

 

IC601.

when pin 1 is DC 5V?

 

 

 

 

 

 

 

 

 

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Is DC 1.8V measured at pin 2 of IC602

No

Check the circuits related to

 

 

 

IC602.

 

 

 

 

when pin 3 is DC 5V?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Yes

 

 

 

 

 

 

 

 

 

Check and replace the IP board.

 

 

 

 

 

 

 

 

 

Caution

Make sure to disconnect the power before working on the IP board.

4-2

Image 30
Contents LCD-Monitor Contents CIS Disassembly and Assembly Simple Stand DisassemblyDescription Photo Description Photo Has Stand Disassembly Exploded View & Part List Simple Stand Exploded View LS19MYNKFZ/XBM1. LS19MYNKFZ/XBM Parts List 943NWX LS19MYNKFZ/XBM Parts List Service Bom SA Service AVAILABLE, SNA Service not AvailablePCB IC-EEPROMS-24CS08AFJ-TB Exploded View & Part List Clamper CORE-WIREALL MODEL,NYLON COVER-STAND FRONTLS19MYW,HIPS HB,BK26,S Product Safety Notices PrecautionsSafety Precautions Servicing the LCD MonitorServicing Precautions Static Electricity PrecautionsGeneral Servicing Precautions Installation Precautions Memo Product specifications Feature & SpecificationsSpec Comparison to the Old Models Magic Color Color Effect Magic Bright3 Magic Tune PremiumAccessories Accessories Sold separatelyMemo Schematic Diagram Circuit DescriptionsSchematic Diagrams Scaler Part Schematic Diagrams Power FlowchartSE717M-LF Schematic Diagrams IP Board  Inverter Part Schematic Diagrams Main PBA Troubleshooting TroubleshootingWhen the Power Does Not Turn On Circuit diagrams when the power does not turn on When the screen is blank Analog When a blank screen is displayed Analog Waveforms when no screen is displayed Analog Error Examples and Actions Adjustment Service Adjustment ConditionsService Function Specifications  Checking the Code Version When replacing the panel  Inputting the DDC Data  Inputting the MCU Data Page Memo Wiring Diagram Wiring Diagram Main BoardWiring Diagram IP Board SE717M-LFConnector Functions CablesMemo