Circuit & Software Description; Special Function With Press Key; Circuit Function Description - Acer AL707 Service Manual

5-1 SPECIAL FUNCTION WITH PRESS-KEY
A). press Menu button during 2 seconds along with plug-in the DC Power cord:
That operation will set the monitor into "Factory- mode", in Factory mode we can do the White balance
adjustment with RS232
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 Brightness
OSD-INDEX EXPLANATION
1. CABLE NOT CONNECTED: Signal-cable not connected.
2. INPUT NOT SUPPORT:
a. INPUT frequency out of range: H > 83kHz, v > 75Hz or H < 28kHz, v < 55Hz
b. INPUT frequency out of VESA-spec. (out of tolerance too far)
5-2

CIRCUIT FUNCTION DESCRIPTION

1. U200,GMZAN2 ( all-in-one chip solution for ADC, OSD, scalar and interpolation) :
USE for computer graphics images to convert analog RGB data to digital data with interpolation process,
zooming, generated the OSD font , perform overlay function and generate drive-timing for LCD-PANEL.
2. U302,W78E62(WINBOND- MCU, type 8052 series with 64k Rom-size and 512 byte ram) :
Use for calculate frequency, pixel-dot , detect change mode, rs232-communication, power-consumption
control, OSD-index warning , ...etc.
3. U203,24LC21 (MicroChip IC) :
EEPROM type, 1K ROM-SIZE, for saving DDC-CONTENT.
4. U300,24C16 (ATMEL IC) :
EEPROM type, 16K ROM-SIZE, for saving AUTO-config data, White-balance data, and Power-key status
and Backlight-counter data.
5. U304,LM2569S( NS brand switching regulator 12V to 5V with 3A load current) .
6. U305,AIC 1084-33CM (AIC brand linear regulator 5V to 3.3V)
7. U905,RT9164(Linear regulator 5V to 2.5V)
8. U600,U601,LVDS ( use NOVATEK NT7181F)
Convert the TTL signal to LVDS signal , the advantage of LVDS signal is : the wire can be lengthen and
eliminate wire number , low EMI .LVDS signal is high frequency but low voltage, only 0.35 VPP ,the
frequency is seven times higher than TTL
9. U401, 74F14D(Schmitt triggger)
The 74F14 contains six logic inverters which accept standard TTL input signals and provide standard TTL
Output levels
5. CIRCUIT-DESCRIPTION
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