Samsung 943NWX service manual When the screen is blank Analog

Page 32

4. Troubleshooting

4-3. When the screen is blank (Analog)

Symptom

- LEven though the LED power turns on, the screen is blank when connecting the VGA cable.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

- Even though the LED power turns on, the screen is blank when connecting the VGA cable.

Major checkpoints

- Check the D-sub cable connections.

- Check whether the LVDS cable is connected correctly to the panel.

 

- Check whether the lamp connector of the panel is connected correctly to the IP board.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CN 400

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

IC 200

 

 

 

 

 

X 201

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R111, R114, R118

 

 

Check the signal cables and

 

 

 

 

 

 

their connections.

 

 

 

 

 

 

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Is X201 oscillating correctly?

No

Check and replace the circuits

 

 

 

 

related to X201.

 

 

 

 

 

 

 

 

 

 

Yes

 

 

 

 

 

 

 

 

Do the RGB inputs appear at R111,

No

Check the R111, R114, and

 

 

R114, and R118?

 

 

R118 input terminals.

 

 

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

 

Do the Hsync and Vsync

No

 

Check the circuits related to

Diagnostics

waveforms appear at pins 32, 33 of

 

 

IC200.

 

 

IC200, respectively?

 

 

 

 

 

 

 

 

 

 

 

 

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

Do output signals appear at pins 8 to 30

No

Check the circuits related to

 

 

of CN400?

 

 

CN400.

 

 

 

Yes

 

 

 

 

 

 

 

 

No

 

 

 

 

 

 

 

 

Is DC 5V measured at pins 1, 2, and 3

Check the +5V_Panel signal

 

 

of the CN400?

 

 

and the BL_EN signal.

 

 

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Check and replace the panel.

 

 

 

 

 

 

 

 

 

 

 

Caution

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

4-4

Image 32
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 Precautions Safety PrecautionsProduct Safety Notices Servicing the LCD MonitorGeneral Servicing Precautions Servicing PrecautionsStatic Electricity 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 DescriptionsSE717M-LF Schematic Diagrams Scaler PartSchematic Diagrams Power Flowchart 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