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Precaution
1. Precaution
To avoid possible damage, electric shocks or exposure to radiation, follow the instructions below with regard to safety,
installation, service and ESD.
1-1 Safety Precautions
1. Make sure all protective devices are properly installed 6. Warning - Hot Chassis:
including non-metallic handles and compartment covers Some TV chassis are directly connected to one end of
when installing or re-installing the chassis or chassis the AC power cord for electrical reasons. Without
assemblies. insulated transformers, the product can only be repaired
safely when the chassis is connected to the earth end of
2. Make sure there aren't any gaps between the front and the AC power source.
rear cover that anyone could insert they're fingers into
and receive any electrical shock. These gaps include To make sure the AC power cord is properly connected,
ventilation holes, cracks, etc. follow the instructions below. Use the voltmeter to
measure the voltage between the chassis and the earth
Errors may occur when the resistance is below 1.0 or ground. If the measurement is over 1.0V, unplug the AC
over 5.2 . In these cases, make sure that the device power cord and change the polarity before re-inserting it.
is repaired before sending it back to the customer. Measure the voltage between the chassis and the
ground again.
3. Check for Electricity Leakage (Figure 1-1)
Warning: Do not use an insulated transformer for 7. Some TV chassis are shipped with an additional
checking the leakage. Use only those current leakage secondary grounding system. The secondary system is
testers or mirroring systems that comply with ANSIC adjacent to the AC power line. These two grounding
101.1 and the Underwriter Laboratory's specifications systems are separated in the circuit using an
(UL1410, 59.7). unbreakable/unchangeable insulation material.
Fig. 1-1 AC Leakage Test
8. When any parts, material or wiring appear overheated or
damaged, replace them with new immediately. When
any damage or overheating is detected, correct this
(READING SHOULD
LEAKAGE NOT BE ABOVE immediately and make a regular check of possible
DEVICE 0.5mA)
UNDER
CURRENT
TESTER
errors.
TEST
TEST ALL
EXPOSED METAL
9. Check for the original shape of the lead, especially that
SURFACES of the antenna wiring, any sharp edges, the AC power
2-WIRE CORD and the high voltage power. Carefully check if the wiring
ALSO TEST WITH
is too tight, incorrectly placed or loose. Never change the
PLUG REVERSED space between the part and the printed circuit board.
(USING AC ADAPTER EARTH
PLUG AS REQUIRED) GROUND Check the AC power cord for possible damages.
Keep the part or the lead away from any heat-emitting
materials.
4. A high voltage is maintained within the specified limits
using safety parts, calibration and tolerances. When 10. Safety Indication:
voltage exceeds the specified limits, check each special Some electrical circuits or device related materials
part. require special attention to their safety features, which
cannot be viewed by the naked eye. If an original part is
5. Warning for Engineering Changes: replaced with another irregular one, the safety or
Never make any changes or additions to the circuit protective features will be lost even if the new one has a
design or the internal part for this product. higher voltage or more watts.
Ex: Do not add any audio or video accessory
connectors. This might cause physical damage. Critical safety parts should be marked with ( ! ).
Furthermore, any changes or additions to the original Use only regular parts for replacements (in particular,
design/engineering will invalidate the warranty. flame resistance and dielectric strength specifications).
Irregular parts or materials may cause electric shock or
fire.
Samsung Electronics 1-1
Precaution
1-2 Servicing Precautions
Warning 1: First carefully read the "Safety Instruction" in this service manual. When there is a conflict between the service and
the safety instructions, follow the safety instruction at all times.
Warning 2: Any electrolytic capacitor with the wrong polarity will explode.
1. The service instructions are printed on the cabinet, and 7. Any B+ interlock should not be damaged.
should be followed by any service personnel. If the metal heat sink is not properly installed, no
(UL / FCC