Read Sharp LL-172G Service Manual online
LL-172A-W/B/LL-172G-W/B
CONNECTION, ADJUSTMENT, OPERATION, AND FUNCTIONS
2 – 13
5. PROCEDURE FOR REPLACING MAIN PWB FOR THE LL-172A/G SERIES
[When replacing the main PWB]
1. REWRITING EDID DATA (RECORD SOGREF VALUE)
If EDID data are different (almost always different whenever the main
board is replaced):
you need to change the model name, serial number and usage time.
1-1. Check Product information before replacing the main PWB.
Record the usage time the LCD has been used.
1-1-1. Turn off the main power supply and then turn it on.
If the LEDs (green, orange) come on, press the [POWER] button to turn
them off.
1-1-2. Hold down the MODE button and press the [POWER] button.
The former model name, serial number and usage time are displayed
as follows:
[Product information]
Record the usage time (150 hours in this case).
1-2. Check SOGREF
If the D-SUB 15 pin analog input signal is the sync-on green, you can set a
threshold value for the input signal.
Hold down the [MENU], [MODE], and [
3
] button and press the [POWER] button.
The following screen is displayed.
Record the SOGREF value (1 in this case).
1-3. Rewrite EDID data according to the procedure for writing
IEDID data for LL-172A/G series.
Write the model name and serial number to EDID.
(Example: The model name is rewritten to the LL-172A-B and the serial
number to 3T0003X.)
number to 3T0003X.)
2. SET [PRODUCT INFORMATION] AFTER LOADING
THE EDID PROGRAM
2-1. Turn off the main power supply and then turn it on.
If the LEDs (green, orange) come, press the [POWER] button to turn
them off.
2-2. Execute All reset.
Hold down the [MENU] + [MODE] buttons and press the [POWER] button.
All reset is executed and the [ENGLISH] OSD is displayed.
2-3. Read Product information that has been written in EDID
Hold down the [MODE] + [
3
] buttons and press the [POWER] button.
The following screen is displayed.
Press both the [
1
] + [
3
] buttons simultaneously.
The model name and serial number that have been newly written in
EDID are shown.
EDID are shown.
Press the MENU button to read the model name and serial number of EDID.
2-4.
Hold down the MODE button and press the POWER button.
The former model name, serial number and usage time are shown as
follows:
Check the Product information on the above screen before pressing the
[MENU] button to finish the screen.
3. IF THE USAGE TIME IS DIFFERENT FROM THAT
SHOWN BEFORE REPLACEMENT OF THE BOARD.
(almost always different whenever the main board is replaced)
Enter the usage time recorded before replacement (150 hours in this example).
3-1. Correct the usage time in the following manner:
Hold down the [MENU] + [MODE] + [
1
] + [
3
] buttons and press the
[POWER] button.
The following screen is displayed.
VERSION
CHECKSUM
MODEL
S/N
LANG
TIME
㧦
LL-172A-B
㧦
4T000014
㧦
JAPANESE
㧦
150
SOGREF : 3
㧦
1.0X
㧨
2004XXXX
㧪
㧦
XXXX
1 [ | - - - - - - - - - ]
SOGREF
MODEL S/N
DISCONNCT ANALOG RGB CABLE
PRESS BOTH [<-] AND [->] KEY
PRESS BOTH [<-] AND [->] KEY
MODEL S/N
DISCONNCT ANALOG RGB CABLE
PRESS BOTH [<-] AND [->] KEY
PRESS BOTH [<-] AND [->] KEY
LL-172A-B
: LL-172A-B
: 3T00003X
: 00000 h
Product information
Model name
Serial number
Usage time hours
Serial number
Usage time hours
SET/RESET USAGE TIME
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