87
202P4 M25P
Repair Flow Chart
24.Selftest
check pin24
1.no H/V sync & first power ON
- show msg.
2.H/V sync exist
- normal
3.H/V sync non-exist & after power ON
- power saving
4.Left+Right Keys pressed with IFcable
- factory mode
5.left +Right Keys pressed without IF cable
- burn in mode
check idle status
sda=pin25=hi
scl=pin26=hi
25,26. DDC bus
check idle status
sda=pin32=hi
scl=pin31=hi
31,32 IIC bus
check keys Enter,
up,down,left,right
23. Keypad
4. Rotation
check duty cycle of
check duty cycle of
pwm from 0% to 100%
pwm from 0% to 100%
37. Brightness
check 1891~1895
3891~3895
30. EEPROM
write protection
check
7336
pin7
Write : low
check
7336
M24C16
7421 TDA4856
7781 WT6803
7701 TDA4887
check
from 5V to 0V
5, Reset
check
2304/3307
check
active=hi
no active=low
22. Degauss
Summary of Contents for 202P4
Page 31: ...Terminal Schematic Diagram A1 Go to cover page ...
Page 33: ......
Page 34: ......
Page 35: ...Go to cover page ...
Page 37: ...Key Control Schematic Diagram 202P4 M25P 32 34 Go to cover page E ...
Page 39: ...Go to cover page ...
Page 41: ......
Page 43: ...Power Schematic Diagram C C1 C6 C2 C7 C3 C4 C5 C9 C8 Go to cover page ...
Page 45: ...Drive Schematic Diagram 202P4 M25P 32 38 D Go to cover page ...
Page 91: ...83 202P4 M25P Repair Flow Chart Go to cover page 7 0 2 ...