Block Diagram; Special Function With Press Key; Circuit Function Description; Main Board - Envision EN9110 Service Manual

555
6655-1 SPECIAL FUNCTION WITH PRESS-KEY
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 touser-mode. The OSD-index explanation is as following:
1. No signal: No signal input (Signal-cable not connected).
2. Input not supported:
a. Input frequency out of range: H > 92kHz, v > 85Hz or H < 31kHz, v < 55Hz
b. Input frequency out of VESA-spec. (Out of tolerance too far)
5-2

CIRCUIT FUNCTION DESCRIPTION

5-2-1 main board

1. U600, scaler IC gm5020 (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. U502, W78E65 (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. U301,ATMEL12524C02N
EEPROM type, 1K ROM-SIZE, for saving Digital DDC-CONTENT.
4. U302, MIRCOCHIP24LC21A
EEPROM type, 1K ROM-SIZE, for saving Analog DDC-CONTENT.
4. U501, 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. U901,SI8050(switching regulator 12V to 5V with 3A load current) .
6. U904,AIC 1084-33CM (AIC brand linear regulator 5V to 3.3V)
7. U902,RT9164(Linear regulator 5V to 2.5V)
8. U201,U202,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
55

BLOCK DIAGRAM

14