SHARP LCD LC-22GA3H_LC-22GA3M_LC-22GA3X _ SERVICE MODE _ ADJSUTMENTS _
INITIALIZATION _LAMP ERROR DETECTION _ RESETTING OF LAMP ERROR COUNT
PREPARATION FOR ADJUSTMENTS
Use the exclusive-use AC adapter or
stable DC power supply.
- LC-22GA3M......... AC Adapter: UADP-A066WJPZ DC power supply: 13 V 6.0A
- LC-22GA3H/X...... AC Adapter: UADP-A056WJPZ DC power supply: 13 V 7.0A.
ADJUSTMENT PROCEDURE
INITIALIZATION
Adjusting the checker
- Turning on the power (initialization) => Setting the model and size in inches => Transferring the model-specified data to the E2PROM (I2C) => Calling the adjustment process mode => Starting the adjustment.
Adjusting the finish process
- Reassembling the set => Turning on the power => Calling the adjustment process mode => Adjusting the common bias, TV contrast and white balance (cutoff and gain).
ENTERING INTO ADJUSTMENT MODE
There are two ways to enter into
this mode
- Turn on the power and press the "adjustment process" key on the remote controller.
- Keep the KEY4 voltage (at pin (81) of microprocessor) at "L" and turn on the power.
- To start servicing: Hold down the "INPUT" key and the "VOL (–)" key at once, and turn on the "POWER" switch. ("K" appears at the top left of the screen to indicate the inspection process mode.) Then press the "CH (Ù)" key and the "VOL (–)" key at the same time. (The screen comes on to the adjustment process mode.)
- To exit this mode, turn off the power. (To do this, turn off the "POWER" switch either on the set or the remote controller.)
USING KEYS FOR ADJUSTMENT PROCESS
Selecting a reception channel
- Using the "CH (^)/(V)" key, turn up and down reception (broadcasting) channels. Just click on the key, and channels are selected on by one.
- Hold down the key, and the next receivable channel is searched up and down.
Adjustment items
- Adjust each of the items by using the "MENU", "CURSOR UP/DOWN" and "VOL (+)/(–)" keys (on the set or on the remote controller).
- Select an adjustment item using the "CURSOR UP/DOWN" key.
- An adjustment item is toggled on and off by activating the MENU SELECT key (next item). Let’s suppose that the item at the bottom of a page is now selected. When the "MENU" key is activated here, the item at the top of the next page will be selected.
- No matter which item is selected, pressing the "AUTO PRESET" key will move the cursor to the top item on the next page. Page 1 => Page 2 => Page 3 => Page 9 => Page 1 ...
- No matter which item is selected, pressing the "MANUAL MEMORY" key will move the cursor to the top item on the current page.
- Using the "CURSOR RIGHT/LEFT" key and "VOLUME UP/DOWN" key, increase or decrease the selected adjustment value.
- Set pins (81) and (82) of IC2001 (microprocessor) to GND. Turn on the power, and the set will be initialized with "INITIALIZED" displayed onscreen.
- Enter the adjustment process mode.
- Select the inch size (22) (Just make sure the size is fixed at "22" on this model.).
- Select a model number. The initial setting is "A645H".
- LC-22GA3H: Make sure "A645H" has been selected.
- LC-22GA3M/X: Select "A645M".
# When "A645M" is selected,
the screen will be blanked and the power will be turned off automatically, immediately
after which the power will be tuned on automatically and the set will be
restarted. (Automatic resetting of the
microprocessor as a result of changing the model).
## When "GA3H (A645H)" has
been selected, the "WSS" and "4:3 MODE" settings do not
appear in the menu setup screen. "LANGUAGE" contains two languages
(English and Chinese). No teletext is accepted.
### When "GA3M (A645M)" has
been selected, the "WSS" and "4:3 MODE" settings are
available. "LANGUAGE"
contains three languages (English, Chinese and Arabic). Teletext broadcast can
be accepted.
LAMP ERROR DETECTION
This LCD colour television has a
function (lamp error detection) to be turned off automatically for safety when
the lamp or lamp circuit is abnormal.
If
the lamp or lamp circuit is abnormal, or some other errors happen, and the lamp
error detection is executed, the followings occur.- The main unit of television is turned off 5 seconds after it is turned on. (The power LED on the front side of TV turns from green to red.).
- If the situation 1 happens 5 times sequentially, television can not be turned on. (The power LED remains red.).
COUNTERMEASURES
Check when turning off the lamp error
detection.
When television is turned off by the
lamp error detection mentioned above, it enters the adjustment process with the
power LED red. Entering the adjustment process turns off the error detection
and turns on TV.
This enables the operation check to
detect errors in the lamp or lamp circuit.
Check
whether "ERROR NO RESET" on line 4, page 1 of the adjustment process
is 1 or more. If it is 1 or more, it indicates the lamp error detection was
executed
RESETTING OF LAMP ERROR COUNT
- After confirming that the lamp or lamp circuit is normal, reset the lamp error count. Select "ERROR NO RESET" on line 4, page 1 of the adjustment process and set the number to 0 using the volume button.
Page 1 of
the adjustment process (Below shown is the screen of model LC-22GA3M)
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1
M O D E L A645M
I N C H S I Z E 22
E R R O R N O R E S E T 5
P U B L I C M O D E OFF
E X
T C O N T R O L OFF
V E R R
O M 1. 0 0A G AI B U 0. 0 0 0
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