Samsung NK17A Servicing Precautions, Electrostatically Sensitive Devices ESD Precautions

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1 Precautions

1-2 Servicing Precautions

CONFIDENTIAL

WARNING: An electrolytic capacitor installed with the wrong polarity might explode.

Caution: Before servicing units covered by this service manual, read and follow the Safety Precautions section of this manual.

Note:If unforeseen circumstances create conflict between the following servicing precautions and any of the safety precautions, always follow the safety precautions.

1-2-1 General Servicing Precautions

1.Always unplug the unit’s AC power cord from the AC power source and disconnect the DC Power Jack before attempting to:

(a)remove or reinstall any component or assembly,

(b)disconnect PCB plugs or connectors, (c) connect a test component in parallel with an electrolytic capacitor.

2.Some components are raised above the printed circuit board for safety. An insulation tube or tape is sometimes used. The internal wiring is sometimes clamped to prevent contact with thermally hot components. Reinstall all such elements to their original position.

3.After servicing, always check that the screws, components and wiring have been correctly reinstalled. Make sure that the area around the serviced part has not been damaged.

4.Check the insulation between the blades of the AC plug and accessible conductive parts (examples: metal panels, input terminals and earphone jacks).

5.Insulation Checking Procedure: Disconnect the power cord from the AC source and turn the power switch ON. Connect an insulation resistance meter (500 V) to the blades of the AC plug.

The insulation resistance between each blade of the AC plug and accessible conductive parts (see above) should be greater than 1 megohm.

6.Always connect a test instrument’s ground lead to the instrument chassis ground before connecting the positive lead; always remove the instrument’s ground lead last.

1-3 Electrostatically Sensitive Devices (ESD) Precautions

Some semiconductor (solid state) devices can be easily damaged by static electricity. Such components are commonly called Electrostatically Sensitive Devices (ESD). Examples of typical ESD devices are integrated circuits and some field- effect transistors. The following techniques will reduce the incidence of component damage caused by static electricity.

1.Immediately before handling any semiconductor components or assemblies, drain the electrostatic charge from your body by touching a known earth ground. Alternatively, wear a discharging wrist- strap device. To avoid a shock hazard, be sure to remove the wrist strap before applying power to the monitor.

2.After removing an ESD-equipped assembly, place it on a conductive surface such as aluminum foil to prevent accumulation of an electrostatic charge.

3.Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ESDs.

4.Use only a grounded-tip soldering iron to solder or desolder ESDs.

5.Use only an anti-static solder removal device. Some solder removal devices not classified as “anti-static” can generate electrical charges sufficient to damage ESDs.

6.Do not remove a replacement ESD from its protective package until you are ready to install it. Most replacement ESDs are packaged with leads that are electrically shorted together by conductive foam, aluminum foil or other conductive materials.

7.Immediately before removing the protective material from the leads of a replacement ESD, touch the protective material to the chassis or circuit assembly into which the device will be installed.

Caution: Be sure no power is applied to the chassis or circuit and observe all other safety precautions.

8.Minimize body motions when handling unpackaged replacement ESDs. Motions such as brushing clothes together, or lifting your foot from a carpeted floor can generate enough static electricity to damage an ESD.

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NK15A*/NK17A*

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Contents TFT-LCD TV/MONITOR Confidential Safety PrecautionsElectrostatically Sensitive Devices ESD Precautions Servicing PrecautionsSpecifications Product SpecificationsSUB Pin AssignmentsTiming Chart Supported Modes ∝ s Confidential Replacement Order of Lamp Assemblies DisassemblyReassembly General Alignment Instuction Alignments and AdjustmentsEntering Factory Mode Factory Mode AdjustmentsConfidential Memo No Power TroubleshootingNo Video PC Signal No Picture TV, Video, S-Video, Scart Confidential No Sound Does the signal appear atConfidential Exploded View and Parts List NK15A NK17A Assy Stand NK17NS PCB+SH/PCB SCREW-TAPTITE BH,+,B,M3,L6,ZPCYEL,SWRCH18A Heat SINK-IC DIODE-ZENER IC-VIDEO Process R232 R805 R504 R512 Network CERAMIC,CHIP C853 C116 C3AA C849 C354 AL,SMD C115 INDUCTOR-SMD CORE-FERRITE Bead CIS CARD-REGISTRATION BOX,12P,1R,2.5mm,STRAIGHT,SN BN83-00284A D017 IC-AUDIO AMP R026 R643 R038 R678 R438 Chip C542 C465 02nF,5%,50V,NP0,TP,1608 022nF,5%,50V,NP0,TP,1608 C015 C332 AL,SMD AL,SMD SNA SNA SNA FT811 PAD-PALLET Cover EK-04,40V,1.5A,DO-41 BN83-00272A DIODE-SCHOTTKY IC-VIDEO Process R526 R618 R115 R654 R645 Chip C538 C237 C3AA C040 C306 AL,SMD C870 120uF,20%,6.3V,WT,TP,10.3x10.3x10.3mm,9 CRYSTAL-SMD Lever TOP LSD210TL,PE-LD,WHITE,TFTLCD Assy LCD NK17NS BN83-00086A DIODE-SWITCHING TR-SMALL Signal R002 R525 R044 R248 R503 Chip IC621 C091 C059 C3AA C216 AL,SMD C284 Organic INDUCTOR-SMD +SH/PCB SCREW-TAPTITE BH,+,B,M3,L10,ZPCYEL,SWCH10 Block Diagram NK15A*/NK17A Block Diagrams Wiring Diagram Schematic Diagrams CPU Block & Signal Processing Part Schematic Diagram Schematic Diagrams1IC011 #1 RF-CVBS 2IC011 #5 S-Video 3IC011 #8 VCR IC011 #19 AGDP5 Scaler & Digital Output Part Schematic DiagramX201 To Speaker DC Power Input, Sound, Tuner, ETC Part Schematic DiagramIC801 #2 IC805 #1 BN81-00027C-00