Acer G225HQ Service Manual page 58

RTD2555LH 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:
EM I Filter
#1 EMI Filter
This circuit (Fig.2) is designed to inhibit electrical and magnetic interference for meeting FCC, VDE, VCCI
standard requirements.
Rectifier and
filter
transformer
Switching
PW M contrller
Feedback
C603
1000P M
C601
0.22U M
- 58 -
Isolation
Rectifier and
power
filter
Rectifier and
element filter
Isolation
Fig.1
L6
C602
0.22U M
C604
1000P M
N3
L602
20MH
N1
Inverter circuit
+5V Output
LDO regulator