Read LG MT-42PM13B (CHASSIS:RF-04GC) Service Manual online
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
the Schematic Diagram and Replacement Parts List.
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.
the 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.
it 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.
connect 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,
- There's maybe a defect in consecutive operation of remote control in specified brightness according to this set feature.
switches the set on from standby or
off to standby.
changes the picture format.
displays on screen menus one by one.
exits the current menu.
memorizes menu changes.
returns to the previously viewed pro-
Note : This function works only when
will select a stored favorite pro-
to select the sound appropriate to
your viewing programme character.
sets the sleep timer.
selects the language during dual lan-
selects the sound output.
For further details, see the ‘Teletext’
Note : In teletext mode, the PIP PR
+/-, SWAP and PIP INPUT buttons are
used for teletext function.