DOWNLOAD Sharp PN-L602B (serv.man6) Service Manual ↓ Size: 11.82 MB | Pages: 127 in PDF or view online for FREE

PN-L702B/L602B　SERVICE MENU/VARIOUS SETTING TOOL OPERATING PROCEDURES

 4 – 37

■ CONDITIONS

n

Viewing distance : 0.35±0.1 [m]

n

Viewing angle : 0degree and ±45 - 80degree

n

Criteria : visual observation

■ BACKGROUND

n

The way of driving TFT-LCD panel is AC drive to prevent seize.

n

For example AC drive is that voltage applied to TFT change from +B [V] to 0 [V] in time for 100% signal level. And the reference voltage is +A [V] (=B/2).

n

0 [V] is not change among TFT-LCD panels.

n

Though input voltage is +B[V], actual voltage applied to TFT is change among panels.

n

If the reference voltage is fixed to +A[V], DC may generated. Because difference of voltage (A-0) is not equal to (B-A).

n

Because DC may occur seize, the reference voltage should be adjusted with dedicated pattern to be center of 0[V] and +B[V].

n

The reference voltage is called VCOM. VCOM is adjusted in flicker adjustment.

+B

+0

Voltage applied to TFT [V]

Time

+B

+0

Time

ăSeize of LCD may occur.

Voltage applied to TFT [V]

waveform at
100%signal level

+A (VCOM)

waveform at
50%signal level

(=B/2)

+A (VCOM)

+B/2

These difference of
voltage must be same.

DC is generated.
The voltage is |A-B/2|[V].

This level is change among 
TFT-LCD panels.

PN-L702B/L602B　SERVICE MENU/VARIOUS SETTING TOOL OPERATING PROCEDURES

 4 – 38

The operating conditions of the Flicker adjustment tool of the informa-

tion display are as follows.

■ WHEN CONNECTED TO THE INFORMATION 

The required RS-232C cable is as shown below. Connect the PC’s 

COM port and the RS-232C input terminal of the display with the cable. 

■ WHEN CONNECTED TO THE INFORMATION 

To use a LAN communication, settings must be made both in the PC side

and in the display side. 

For details of LAN, refer to following description.
3Refer to the Operating Manual.

n

It does not operate normally in the power standby state or the sig-

nal standby state. Provide a signal to the current input or set the

power management to “NO.”

Press [Flicker Adjustment] button of the service tool launcher and the

following message is displayed. Check to confirm that a jig is installed,
and press [OK] button.

n

Windows XP

n

Windows Vista

n

Windows 7

An authorized copying and distribution pack-
age of Microsoft Visual C++ 2005 or later is 

required to be installed.

n

RS-232C port recognized as a COM port 

(Which allows communication in 9600/19200/

38400bps.)

n

LAN

To use this tool, a jig is required.

Straight cable (D-SUB 9 pin female - female)

RS-232C input 
terminal

RS-232 straight cable
(commercially available)

To COM port

PC

PN-L702B/L602B　SERVICE MENU/VARIOUS SETTING TOOL OPERATING PROCEDURES

 4 – 39

The flicker adjustment procedures by use of the flicker adjustment tool

are as follows:

1 ) Press [Connection Setting] button, and perform the communication

setting.

2 ) Press [Flicker] button, and the adjustment pattern is displayed on

the monitor and [Flicker] button turns to yellow-green color. In addi-

tion, the current adjustment value is stored in Reg Value (VCOM
value) and [UP+1], [UP+5], [DOWN-1], [DOWN-5], and [Write] but-

tons are enabled.

3 ) When [UP+1] or [UP+5] button is pressed, the Reg Value is

increased by 1 or 5 respectively (up to max. 127). When [DOWN-1]

or [DOWN-5] button is pressed, the Reg Value is decreased by 1 or

5 respectively (up to min. 0). 

4 ) When [Write] button is pressed, the Reg Value is written as the

adjustment value.

5 ) When [Flicker] button is pressed again, the adjustment pattern on

the monitor disappears and [Flicker] button turns to gray color. In

addition, the Reg Value is deleted and [UP+1], [UP+5], [DOWN-1],

[DOWN-5], and [Write] buttons are disabled. 

6 ) When [Exit] button is pressed, the tool is terminated. When the tool

is terminated with the adjustment pattern on the monitor displayed,

the adjustment pattern on the monitor is deleted. 

n

When the tool is used in a LAN connection, if a certain time
passes without any operation, the connection is closed. If, there-

fore, the adjustment is failed, press [Flicker] button and reconnect

the LAN connection.

PN-L702B/L602B　SERVICE MENU/VARIOUS SETTING TOOL OPERATING PROCEDURES

 4 – 40

This tool provides the capability of checking the LED/ Sensor condition (normal/abnormal) of this display’s touch panel, and extracting the relevant
information.

1 ) Prepare PC with Windows XP/Vista/7 OS having a USB terminal.

2 ) Connect the information display to the USB port of PC by a USB cable.

3 ) To change the diagnosis conditions, change “check.ini” (the setting file) in “TPanelTools” folder according to the necessity. 

(Normally, there is no need to change this setting.)

When the condition of LED/Sensor needs to be checked, please follow the procedures as shown below.

Press [LED/sensor] button of the service tool launcher. Content of display and Diagnostic approach can be changed by configuration file. 
3Refer to page 4 - 45  "(8) CHANGE CONFIGRATION".

1

3

5

6

2

4

7

9

F

8

1 Machine 

Information

Model name of diagnosed touch panel is dis-
played.

2 Diagnostic 

result

The diagnostic result obtained when press-
ing the [Check] button is displayed as OK or 

NG.

3 Status

OK/NG of the state of LED and sensor is dis-

played separately in substrate. 

(However, when error is detected, error step 
is displayed.)
3Refer to page 4 - 43  "(5) DISPLAY 

4 AGC Config, 

Scan Config

Current AGC configuration and current scan 

configuration is displayed.
3Refer to page 4 - 41  "(2) AGC Config, 

5 Service 

Information

The sensor maximum/minimum values 

obtained with the LED on and those with the 

LED off are displayed separately in Horizon-
tal/Vertical PWB.

6 Pwd order

The diagnostic data obtained when pressing 
the [Check] button is displayed in substrate 

order.
3Refer to page 4 - 42  "(4) OBTAIN STATE 

7 LED difference 

order

The diagnostic data obtained when pressing 
the [Check] button is displayed in difference 

between ON value and OFF value order.
3Refer to page 4 - 42  "(4) OBTAIN STATE 

8 Check

Press [Check] button, and the processing 
described (3), (4) is executed.