73
107P2 CM 25 GSIII
Repair Flow Chart (Continued)
24. Selftest
check pin 24
1.no H/V sync & IF cable pin5 floating
- show msg.
2.H/V sync exist & IF cable pin5 to ground
- normal
3.H/V sync non-exist & IF cable pin5 to gnd
- power saving
4.connect a 15k resistor with IF cable pin5
- factory mode
5.connect a 5k1 resistor with IF cable pin5
- burn in mode
check idle status
sda=pin 25=hi
scl=pin 26=hi
25, 26. DDC bus
check idle status
sda=pin 31=hi
scl=pin 32=hi
31, 32. IIC bus
check key
Enter,+,-,bri,con keys
23. Keypad
check
pwm from 0V to 5V
38. Rotation
check
pwm from 0V to 5V
37. Brightness
check
7804 M24C16-BN6
7503 TDA4841
7304 MTV018-27
7301 TDA4886
check
5V
5. Reset
check
active=hi
no active=low
22. Degauss