Tatung VL5A9DA, Service Manual

Page: 10 / 89

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5. CIRCUIT-DESCRIPTION
5-1 THE DIFFERENT between LG-Panel & Samsung-Panel & CPT-Panel & Hannstar- Panel in
ELECTRICAL Charateristic
LG-Panel 1. Two CCFL (Cold Cathode Fluorescent Tube)
2. Single Pixel, 6 bit color (262144 colors)
3. Panel Vdd = 3.3V (in JP202 select 3.3V)
Samsung-Panel 1. Four CCFL (Cold Cathode Fluorescent Tube)
2. Double Pixel, 6 bit color (262144 colors)
3. Panel Vdd = 5V (in JP201 select 5V)
Chung-Hwa Panel 1. Two CCFL (Cold Cathode Flourescent Tube)
2. Double Pixel, 8 bit color (16.7 Million colors)
3. Panel Vdd = 5V (in JP201 select 5V)
Hannstar Panel 1. Two CCFL (Cold Cathode Flourescent Tube)
2. Double Pixel, 6 bit color (262144 colors)
3. Panel Vdd = 3.3V (in JP202 select 3.3V)
5-2 SPECIAL FUNCTION with PRESS-KEY
A) . press Menu button during 2 seconds along with plug-in the AC Power cord :
That operation will set the monitor into “Factory- mode”, in Factory mode we can do the White balance
adjustment with RS232 , and view the Backlight counter (this counter is use to record the panel activate
hours ,for convenient the maintainer to check the panel backlight life time)
In Factory mode, OSD-screen will locate in left top of screen.
Press POWER-button off to on once will quit from factory mode and back to user-mode.
B) . Press both Left & Right button along with Power button off to on once will activate the OSD-LOCK
function, repeat this procedure will disable OSD-LOCK
In OSD-LOCK function, all OSD function will be lock , except Contrast and Brighness
OSD-INDEX EXPLANATION
1. CABLE NOT CONNECTED : Signal-cable not connected.
2.
INPUT NOT SUPPORT :
a. INPUT frequency out of range: H > 62kHz, v > 75Hz or H < 28kHz, v < 55Hz
b. INPUT frequency out of VESA-spec. (out of tolerance too far)
3. UNSUPPORT mode, try different Video-card Setting :
Input frequency out of tolerance, but still can catch-up by our system (if this message show, that means, this
is new-user mode, AUTO-CONFIG will disable)
5-3 THE OPTIONAL on MAINBOARD for using SHUTTLE interface or KEYBOARD ( 4-KEY) interface.
The RESISTOR R319 ( 0 ohm ) which placement between Regulator LM2596 and MCU will be the controller
for choosing KEYBOARD interface or SHUTTLE interface
1). for KEYBOARD interface ( 4-key) , the R319 = 0 ohm resistor
2). For SHUTTLE interface , the R319 = OPEN
5-4 THE OPTION on MAINBOARD or other ACCESSORY when using different PANEL type
1). The MCU software should be change
example : for HANNSTAR panel , the MCU part-number is 56A-1125-61-H
for LG panel , the MCU part-number is 56A-1125-61-L
for CPT panel , the MCU part-number is 56A-1125-61-C
2). the PANEL power should be switch ( JP202 is supply 3.3V, JP201 is supply 5V)
example : for HANNSTAR panel, the jumper on Mainboard JP202 = 0 ohm, JP201 = OPEN
for LG panel, JP202=0 ohm, JP201 = OPEN
for CPT panel, JP202=OPEN , JP201 = 0 ohm