Acer X193HQ Service Manual page 48

2.) EEPROM:
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
PWM
controller
#1 EMI Filter
This circuit (fig. 2) is designed to inhibit electrical and magnetic interference for meeting FCC,
VDE, VCCI standard requirements.
We use 24C16 EEPROM to store monitor user data and user preset timings.
Rectifier
and filter
Switching
element
- 48 -
Isolation
power
transforme
Feedback
Isolation
Fig.1
Fig. 2
Rectifier
and filter
Rectifier
LDO
and filter
regulator
Inverter
circuit