Samsung DP17LS/LT, DP15HS/HT manual Safety Precautions, Servicing the High Voltage VR and CRT

Page 3

1 Precautions

1-1 Safety Precautions

WARNINGS

1.For continued safety, do not attempt to modify the circuit board.

2.Disconnect the AC power before servicing.

3.When the chassis is operating, semiconductor heatsinks are potential shock hazards.

1-1-1 Servicing the High Voltage VR and CRT :

WARNING:A high voltage VR replaced in the wrong direction may cause excessive X-ray emissions.

Caution: When replacing the high voltage adjustment VR, it must be fixed by a soldering iron after it is properly set.

1.When servicing the high voltage system, remove the static charge by connecting a 10 kohm resistor in series with an insulated wire (such as a test probe) between the chassis and the anode lead.

2.If the HV VR requires adjustment, (a) Replace the VR and adjust the high voltage to the specification.

(b) Use a soldering iron to melt the adjustment cap on the HV VR to prevent any movement.

3.When troubleshooting a monitor with excessively HV, avoid being unnecessarily close to the monitor. Do not operate the monitor for longer than is necessary to locate the cause of excessive voltage.

4.High voltage should always be kept at the rated value, no higher. Only when high voltage is excessive are X-rays capable of penetrating the shell of the CRT, including the lead in glass material. Operation at high voltages may also cause failure of the CRT or high voltage circuitry.

5.When the HV regulator is operating properly, there is no possibility of an X-ray problem. Make sure the HV does not exceed its specified value and that it is regulating correctly.

6.The CRT is especially designed to prohibit X-ray emissions. To ensure continued X-ray protection, replace the CRT only with one that is the same or equivalent type as the original.

7.Handle the CRT only when wearing shatterproof goggles and after completely discharging the high voltage anode.

8.Do not lift the CRT by the neck.

1-1-2 Fire and Shock Hazard :

Before returning the monitor to the user, perform the following safety checks:

1.Inspect each lead dress to make certain that the leads are not pinched or that hardware is not lodged between the chassis and other metal parts in the monitor.

2.Inspect all protective devices such as nonmetallic control knobs, insulating materials, cabinet backs, adjustment and compartment covers or shields, isolation resistor-capacitor networks, mechanical insulators, etc.

3.Leakage Current Hot Check (Figure 1-1):

WARNING: Do not use an isolation transformer during this test.

Use a leakage current tester or a metering system that complies with American National Standards Institute (ANSI C101.1, Leakage Current for Appliances), and Underwriters Laboratories (UL Publication UL1410, 59.7).

4.With the unit completely reassembled, plug the AC line cord directly into a 120V AC outlet. With the unitÕs AC switch first in the ON position and then OFF, measure the current between a known earth ground (metal water pipe, conduit, etc.) and all exposed metal parts, including: metal cabinets, screwheads and control shafts. The current measured should not exceed 0.5 milliamp. Reverse the power-plug prongs in the AC outlet and repeat the test.

 

 

 

 

(READING SHOULD

 

 

 

 

NOT BE ABOVE 0.5mA)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LEAKAGE

 

DEVICE

 

 

 

 

 

 

 

 

 

CURRENT

 

UNDER

 

 

 

 

 

 

 

 

 

TESTER

 

TEST

 

 

 

 

 

 

 

 

 

TEST ALL

 

 

 

 

 

EXPOSED METAL

 

 

 

 

 

 

SURFACES

 

 

 

 

2-WIRE CORD

 

 

 

 

ALSO TEST WITH

 

 

 

 

PLUG REVERSED

 

 

 

 

(USING AC ADAPTER

 

 

 

 

PLUG AS REQUIRED)

 

EARTH

 

 

 

 

 

 

 

 

 

 

GROUND

Figure 1-1. Leakage Current Test Circuit

1-1-4 Product Safety Notices

Some electrical and mechanical parts have special safety-related characteristics which are often not evident from visual inspection. The protection they give may not be obtained by replacing them with components rated for higher voltage, wattage, etc. Parts that have special safety characteristics are identified by

!on schematics and parts lists. A substitute replacement that does not have the same safety characteristics as the recommended replacement part might create shock, fire and / or other hazards. Product safety is under review continuously and new instructions are issued whenever appropriate.

Components identified by on schematics and parts lists must be sealed by a soldering iron after replacement and adjustment.

DP15H*/DP17L*

1-1

Page 2 Page 4
Image 3
Page 2 Page 4
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 Color Coordinates TemperatureColor Adjustments for 9300K Focus Adjustment Color Purity AdjustmentLuminance Uniformity Check For trained and experienced service technicians only Troubleshooting Parts Level TroubleshootingNo Power Supply Dpms Failure Correction Failure HDeflection FailureHLin. Failure Invariable HSizeAbnormal HSize Side Pin or Trap Failure Para. or Pin Balance FailureTilt Failure Size or Pos. Variation Failure Deflection FailureABL Failure High Voltage FailureDynamic Focus Failure No Video Micom Failure OSD Failure Degaussing Failure User Control FailureGeneral Troubleshooting No PictureShut Down 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

DP15HS/HT, DP17LS/LT specifications

The Samsung DP17LS/LT and DP15HS/HT are modern digital displays designed for commercial and professional use, showcasing cutting-edge technology and versatile features that cater to a variety of applications. These models are part of Samsung’s commitment to innovation in display solutions, offering impressively vivid visuals and reliable performance.

One of the standout features of the DP17LS/LT and DP15HS/HT is their high-resolution display capabilities. The panels are engineered to deliver sharp and detailed images, making them ideal for advertising, information kiosks, and interactive displays. With a brightness level that exceeds industry standards, these models ensure visibility even in brightly lit environments, allowing content to stand out and capture attention effectively.

Both the DP17LS/LT and DP15HS/HT models are equipped with advanced LED technology, which not only enhances color accuracy and contrast but also provides energy efficiency. This makes them a sustainable choice for businesses looking to minimize their ecological footprint while maximizing visual impact. Moreover, the ultra-narrow bezels of these displays allow for a seamless multi-display setup, enabling businesses to create an immersive visual experience.

Another prominent characteristic is their user-friendly interface and connectivity options. The displays support multiple input types, including HDMI, DisplayPort, and USB, ensuring compatibility with a wide range of devices and systems. This versatility simplifies integration into existing setups and allows for easy content management.

The DP17LS/LT and DP15HS/HT models also incorporate advanced cooling technology to maintain optimal performance during extended operation, minimizing the risks of overheating. This is particularly crucial for environments where displays are running continuously, such as retail stores and transportation hubs.

Furthermore, Samsung’s commitment to durability and longevity is evident in the design of these displays. Built with high-quality materials, they are resistant to wear and tear, ensuring that they remain operational even in high-traffic areas.

In conclusion, the Samsung DP17LS/LT and DP15HS/HT displays stand out as reliable solutions for businesses seeking high performance, vibrant visuals, and robust features. Their combination of cutting-edge technology and practical design makes them an excellent choice for a variety of commercial applications, where quality and efficiency are paramount.
Top Page Image Contents