SAFETY PRECAUTIONS
GENERAL GUIDELINES There are electro-static sensitive components such
as CMOS in LCD Module. Please earth human
1. It is advised to insert an isolation transformer in the
body when handle the LCD.In addition, please do
AC supply before servicing a hot chassis.
not touch the interface connector pin with bare.
2. Always use the manufacturer?s replacement safety
components. The critical safety components marked 8 - Do not operate for a long time under
the same pattern
with on the schematics diagrams should not be
Operating LCD for a long time under the same
by other substitutes. Other substitute may create the
pattern can cause image persistence and can
electrical shock , fire or other hazards. Take
attention to replace the spacers with the originals. damage it. Please follow following guidance.
1. Turn the power off when do not use.
Furthermore where a short circuit has occurred ,
replace those components that indicate evidence of 2. Change the pattern periodically.
overheating.
3. After servicing , see that all the protective devices LEAKAGE CURRENT COLD CHECK
such as insulation barriers, insulation papers, shields 1. Unplug the AC cord and connect a jumper
and isolation R-C combinations are correctly between the two prongs of the plug.
installed. 2. Turn the receiver?s power switch.
4. When the receiver is not being used for a long time 3. Measure the resistance value with an ohmmeter,
of period of time , unplug the power cord of the between the jumpered AC plug and each exposed
Adaptor from the AC outlet. metallic cabinet part on the receiver. When the exposed
Color TFT LCD Module is very sensitive metallic part a return path to the chassis the reading
both electrically and physically.Users, should be between 4Mohm and the 20Mohm. When the
exposed metal does not have a return path to the chassis,
therefore, are requested to follow the
the reading must be infinite.
?Guidance of handling color TFT LCD
Module?on the followings. LEAKAGE CURRENT HOT CHECK
1 -Be careful not to make scratch on the 1. Plug the AC cord directly in to the AC outlet. Do
polarizer. not use an isolation transformer for this check.
2. Connect a 2Kohm 10W resistor in series with an
Surface of polarizer is soft and can be physically
exposed metallic part on the receiver and an earth,
damaged easily.Please do not touch, push or rub
polarizer surface with materials over HB hardness. such as a water pipe.
3. Use an AC voltmeter with high impedance to
2 - Keep clean the surface.
measure the potential across the resistor.
Please wear rubber glove when touch the surface of
4. Check each exposed metallic part and check the
LCD screen. Please use soft and anti-static material voltage at the each point.
as cleaner.
5. Reverse the AC plug at the outlet and repeat each of
3 -Keep out of water.Water on/in the LCD may
the above measurements.
cause electrical short or corrosion. Please wipe out 6. The potential at the any point should not exceed 1.4
dry or water carefully. Vrms. In case a measurement is outside the limits
4 -Prevent swift Temperature & Humidity specified , there is the possibility of a shock hazard ,
change.Instantaneous temperature and/or humidity and the receiver should be repaired and rechecked
change can make dew or ice which cause before it is returned to the customer.
nonconformance such as malfunction.
5 - High temperature & high humidity
reduce the life-time. HOT CHECK CIRCUIT
AC-Voltmeter
LCD is not proper to be used at high temperature
TO INSTRUMENTS
and high humidity. Please keep specified EXPOSED
temperature and humidity condition. METALLIC PARTSWater pipe
6 - Keep out of Corrosive Gas.Corrosive gas (earth)
effect the polarizer and the circuit chemically and
cause defects accordingly. 2 K Ohm
7 - Electrostatic discharge can make
Damage |
ACEC
TOSHIBA
