Acer X193HQL, Product Service Manual, Page: 64 / 79

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compatible in QFN 48-pin package to save cost and make the design easier. The RTD
also includes an ITU656 video format input port with color space converter that makes it
an attractive solution for low cost MFM and TV applications. The output section contains
a 24-bit TTL output interface and a channel LVDS transmitter for direct interfacing of
commercially available LVDS LCD panel modules. In addition, RTD2525LH embedded
16.5KSRAM dynamically stores OSD command and fonts, compatible advanced color
control features.
2.) EEPROM:
We use 24C16 EEPROM to store monitor user data and user preset timings. There are
16 user timing modes are automatically saved in it. Each timing mode is allocated with
22 bytes of memory space for information such as Sync frequencies, polarities… etc.
PC can access the EEPROM data indirectly through the SDA and SCL channels of DVI
and D-sub (IIC communication). The digital and analog DDC data are stored in two
24C02s EEPROM.
A-2.) Power board diagram:
EMI Filter
Rectifier and
filter
Isolation
power
transformer
Rectifier and
filter
DC output
circuit
PWM contrller
Switching
element
LED Dri
circuitt
Feedback
Isolation
Fig.1