View LG 50PK250-UA / 50PK250-UB (CHASSIS:PU01A) Service Manual online
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
the Schematic Diagram and Exploded View.
It is essential that these special safety parts should be replaced with the same components as recommended in this manual to
prevent X-RADIATION, Shock, Fire, or other Hazards.
Do not modify the original design without permission of manufacturer.
servicing of a receiver whose chassis is not isolated from the AC
power line. Use a transformer of adequate power rating as this
protects the technician from accidents resulting in personal injury
from electrical shocks.
damaged by accidental shorts of the circuitry that may be
inadvertently introduced during the service operation.
with the specified.
Resistor, over 1W), keep the resistor 10mm away from PCB.
extreme care should be used in handling the Picture Tube.
Do not lift the Picture tube by it's Neck.
an electrical jumper across the two AC plug prongs. Place the
AC switch in the on position, connect one lead of ohm-meter to
the AC plug prongs tied together and touch other ohm-meter
lead in turn to each exposed metallic parts such as antenna
terminals, phone jacks, etc.
If the exposed metallic part has a return path to the chassis, the
measured resistance should be between 1MΩ and 5.2MΩ.
When the exposed metal has no return path to the chassis the
reading must be infinite.
An other abnormality exists that must be corrected before the
receiver is returned to the customer.
Do not use a line Isolation Transformer during this check.
Connect 1.5K/10watt resistor in parallel with a 0.15uF capacitor
between a known good earth ground (Water Pipe, Conduit, etc.)
and the exposed metallic parts.
Measure the AC voltage across the resistor using AC voltmeter
with 1000 ohms/volt or more sensitivity.
Reverse plug the AC cord into the AC outlet and repeat AC
voltage measurements for each exposed metallic part. Any
voltage measured must not exceed 0.75 volt RMS which is
corresponds to 0.5mA.
In case any measurement is out of the limits specified, there is
possibility of shock hazard and the set must be checked and
repaired before it is returned to the customer.
such as WATER PIPE,
(2) Not included spec and each product spec in this spec sheet apply correspondingly to the following each country
(1) Temperature : 20 °C ± 5 °C
(2) Relative Humidity : 65 % ± 10 %
(3) Power Voltage : Standard input voltage (100 V ~ 240 V @ 50/60Hz)
(2) Demanded other specification
EMC : FCC, ICES, IEC, CE specification