Samsung DP17LS/LT, DP15HS/HT manual High Voltage Failure, ABL Failure

Page 23

5-1-13 High Voltage Failure

No

3IC401 Pin 6 OSC pulse exists?

Yes

No

10 Q402 Gate driving pulse exists?

Yes

No

11Q402 Drain pulse exists?

Yes

Done

Check and replace IC401

and +12 V line.

Check and replace Q401.

Check and replace Q403,

L402.

5 Troubleshooting

WAVEFORMS

32.00 V (IC401, #6)

CH1 P-P = 2.00 V CH1 RMS = 5.868 V

11 2.00 V (Q402, Gate)

CH1 P-P = 2.00 V CH1 RMS = 7.692V

11 50.0 V (Q402, Drain)

5-1-14 ABL Failure

Input full white pattern to monitor.
				Yes

IC101 Pin 12 input exists and
IC101 Pin 12 input exists and
varies with different patterns?
	No



Check CN102.

	No
				No
T501 Pin 8 output exists?



	Yes


				No
IC201 Pin 26 output exists and
IC201 Pin 26 output exists and
varies with different patterns?
	Yes



Done

Check and replace IC101.

Check and replace T501.

Check and replace IC201.

CH1 P-P = 50.0 V CH1 RMS = 73.7V

DP15H*/DP17L*

5-7

Image 23

Contents

Color Monitor Copyright Servicing the High Voltage VR and CRT PrecautionsSafety Precautions Product Safety NoticesElectrostatically Sensitive Devices ESD Precautions Servicing PrecautionsSpecifications Product SpecificationsSync Type Separate Pin AssignmentsIBM Vesa Timing ChartMemo Required Equipment Alignment and AdjustmentsAdjustment Conditions Before Making AdjustmentsSetup 2, Without Signal Generator Connecting the SoftJigCentering Display Control AdjustmentsStandard Modes Linearity LinearitySide Pincushion Adjustment Trapezoid AdjustmentPinbalance Adjustment Parallelogram AdjustmentColor Adjustments for 9300K Color AdjustmentsColor Coordinates Temperature Luminance Uniformity Check Focus AdjustmentColor Purity Adjustment For trained and experienced service technicians only No Power Supply TroubleshootingParts Level Troubleshooting Dpms Failure Correction Failure HDeflection FailureAbnormal HSize HLin. FailureInvariable HSize Tilt Failure Side Pin or Trap FailurePara. or Pin Balance Failure Size or Pos. Variation Failure Deflection FailureABL Failure High Voltage FailureDynamic Focus Failure No Video Micom Failure OSD Failure Degaussing Failure User Control FailureShut Down General TroubleshootingNo Picture Missing Color Visible Retrace Unsynchronized Image Misconvergence Purity Failure Poor FocusDP15HS Exploded View and Parts ListDP17LS Front Cover & CRT Ass’y DP15HS Chassis & Stand Ass’y DP15HS Rear Cover Ass’y DP15HS Front Cover & CRT Ass’y DP17LS Chassis & Stand Ass’y DP17LS Rear Cover Ass’y DP17LS Main PCB Parts Electrical Parts ListLoc. No CIS FBT FH1 Fuse ASSY,HEAT/SINK Carbon Metal Carbons Carbon Carbons Carbon Carbons Metal Carbon Fusible Carbons 17 ! 15 ! 17 ! 15 ! 17 ! 15 ! 17 AA,3.5x1.0x5.7mm,1500 Video PCB PartsLJP1 VID VID+H/S Others Different Parts List CDT Memo Block Block Diagrams Main PCB Wiring DiagramSmps Part Schematic Diagram Schematic DiagramsSchematic Diagrams Micom Part Schematic Diagram DP15H*/DP17L 10-4 10-3 H/V OSC & Vertical Part Schematic Diagram DP15H*/DP17L 10-6 Deflection Part Schematic Diagram DP15H*/DP17L 10-8 Video Part Schematic Diagram DP15H*/DP17L 10-10 10-11 DP15H*/DP17L Code No. BH68-00129A