An isolation transformer should be connected in the power line between the receiver and the AC line before any service is performed on the receiver.
2. Always disconnect the power plug
before any disassembling of the product. It may result in electrical shock.
3. When replacing a chassis in the
cabinet, always be certain that all the protective devices are put back in
place, such as non-metallic control knobs, insulating covers, shields,
isolation resistor-capacitor network, etc.
4. Always keep tools, product
components, etc. away from children as these items may cause injury.
5. Depending on the model, use an
isolation transformer or wear suitable gloves when servicing with the power on.
Disconnect the power plug to avoid
electrical shock when replacing parts. In some cases, alternating current is
also impressed in the chassis, so electrical shock is possible if the chassis
is contacted with the power on.
6. Always use the replacement parts
specified for the particular model when making repairs. The parts used in
products require special safety characteristics such as in-flammability;
voltage resistance, etc. therefore, use only replacement parts that have these
same characteristics. Use only the specified parts when the mark is indicated
in the circuit diagram or parts list.
7. Part mounting and wire routing
should be the same as that used originally. For safety purposes, insulating
materials such as isolation tubes or tape are sometimes used and printed
circuit boards are sometimes mounted floating. Also make sure that wiring is
routed and clamped to avoid parts that generate heat or use high voltage.
Always follow the manufactures wiring routes / dressings.
8. Always ensure that all internal
wirings are in accordance before re-assembling the external casing after a
repair is completed. Do not allow internal wiring to be pinched by cabinets,
panels, etc. Any error in reassembly or wiring can result in electrical
leakage, flame, etc., and may be hazardous.
9. NEVER remodel the product in any
way. Remodelling can result in improper operation, malfunction, electrical
leakage, or flame, which may be hazardous.
10. Always perform an AC leakage
current check on the exposed metallic parts of the cabinet such as antennas,
terminals, screw heads, metal overlays, control shafts, etc. to be sure that
the set is safe to operate without any danger of electrical shock before
returning the set to the customer.
Internal wiring diagram
Firmware update
Firmware updating for this
chassis family is accomplished via a USB port located on the rear of the unit.
It is designated as “Service” and is located between the HDMI and PC audio
input jacks.
The factory mode, necessary adjustments, and update
procedures shown below can be accessed in this unit using the supplied remote control
transmitter. To access the factory mode,
you must press “Left Arrow (<), Exit, Enter” in sequence on the
remote transmitter. The mode can be exited by pressing exit or simply turning
the unit off.
Troubleshooting tables: Set dead – No or distorted video
No Backlight and No
sound troubleshooting
SMPS (Power board)
schematic
