Selftest
check pin34
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=pin36=hi
scl=pin37=hi
36,37. DDC bus
check idle status
sda=pin38=hi
scl=pin39=hi
38,39. IIC bus
check keys
ok,up,down,left,right
33. Keypad
check
pwm from 0V to 5V
4. Rotation
check
pwm from 0V to 5V
30. Brightness
check 3319,
3891~3895
40,41. EEPROM
write protection
check
pin40
pin41
write :
low
low
read :
don't care
normal :
hi
hi
check
7336 M24C16
7421 TDA4856
7781 LSC4389
7701 TDA4886A
check
from 5V to 0V
26, Reset
check
6302/3322
2317/6301
check
active=hi
no active=low
1. Degauss
35. USB int
pin35
hi : active
low : no active
Repair Flow Chart
45
109P2 GS3 CM25
9
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