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Belinea 101536(111514) Service Manual
-16-
04/25/2005
7. WORKING THEOREM
A. DC-DC CONVERTER
The power supply with a high-integrated green-mode PWM controller provides several features to
enhance the performance of power flyback converters.
I801 is a PWM controller and provides many protection functions.
I802 is a photo couple to transfer the feedback signal from the second side which I803 detected
both of the output DC voltage on 3.3V and 12V.
D813 detected the working voltage on I801 and Q805 would pull down the voltage on I801 pin5 to
shut down I801 if feedback loop was failed.
R826 would be a dynamic load which was active while backlight was turned off and system still
working on, this kept 12V output voltage under 13V to protect the panel. After system went to
power saving mode, the R826 would no loaded. This was detected by I804 and Q803 active the
R826 to load or not.
B. Scaling controller
The ADC is to convert RGB analog signal to digital signal that scaling chip can acknowledge.
The HSYNC input receives a logic signal and provides the frequency reference for pixel clock
generation.
The scaling IC is to converts the input signal ranging from VGA to XGA into XGA resolution that
panel can acknowledge.
GENERAL DESCRIPTION
The MST8016A is a high performance, and fully integrated graphics processing IC solution for
LCD monitors with resolutions up to XGA. It is configured with an integrated triple-ADC/PLL, a
high quality scaling engine, an on-screen display controller, a built-in output clock generator, a
panel timing controller (TCON), and RSDS display interface. To further reduce system costs, the
MST8016A also integrates intelligent power management control capability for green-mode
requirements and spread-spectrum support for EMI management.
PIN DESCRIPTION
CPU Interface
Pin Name Pin Type Function Pin
HWRESET Schmitt Trigger Input
w/ 5V-tolerant Hardware reset; active high 32
CS Input w/ 5V-tolerant 3 Wire Serial Bus Chip Select; active high 69
SDA I/O w/ 5V-tolerant 3 Wire Serial Bus Data; 4mA driving strength 70
SCL Input w/ 5V-tolerant 3 Wire Serial Bus Clock 71
INT Output CPU interrupt; 4mA driving strength 72
Analog Interface
Pin Name Pin Type Function Pin
HSYNC0 Schmitt Trigger Input
w/ 5V-tolerant Analog HSYNC input 37
VSYNC0 Schmitt Trigger Input
w/ 5V-tolerant Analog VSYNC input 38
REFP Internal ADC top de-coupling pin 66
REFM Internal ADC bottom de-coupling pin 67
RIN0 Analog Input Analog red input 63
RIN0M Analog Input Reference ground for analog red input 62
SOGIN0 Analog Input Sync-on-green input 61
GIN0 Analog Input Analog green input 60
GIN0M Analog Input Reference ground for analog green input 59
BIN0 Analog Input Analog blue input 58
BIN0M Analog Input Reference ground for analog blue input 57
REXT External resistor 390 ohm to AVDD 52
RSDS Interface
Pin Name Pin Type Function Pin
CLKAP Output A-Link Positive RSDS Differential Clock Output fromOdd Channel 118
CLKAN Output A-Link Negative RSDS Differential Clock Output fromOdd Channel 119
CLKBP Output B-Link Positive RSDS Differential Clock Output fromEven Channel 120
CLKBN Output B-Link Negative RSDS Differential Clock Output fromEven Channel 121
BA[3:1]P Output A-Link Positive RSDS Differential Data Output fromOdd Channel 92, 90, 88
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