49
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Repair Flow Chart (Continued)
V50 109B5
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.Press both left & right keys with IF cable pin5 to ground - factory mode
5.
- burn in mode
Press both left & right keys with IF cable pin5 floating
check
sda=pin 25=hi
scl=pin 26=hi
25, 26. DDC bus
check
sda=pin 31=hi
scl=pin 32=hi
31, 32. IIC bus
check keys, Enter
Left(bri.),Right(con.),Exit keys
23. Keypad
check
pwm from 0V to 5V
38. Rotation
check
pwm from 0V to 5V
37. Brightness
check
7801
WT6ZPZ
7501
TDA4841
7304
NT 68273
7301
TDA4886A
check
5V
5. Reset
check
active=hi
no active=low
22. Degauss
Summary of Contents for V50 109B5
Page 7: ...9 Go to cover page 7 V500 109B5 Wiring Diagram ...
Page 25: ...C B A Of Video Board 25 9 Go to cover page V50 109B5 ...
Page 29: ...C B A Of Main Board 29 9 Go to cover page V50 109B5 ...
Page 30: ...30 V50 109B5 9 Go to cover page C B A Of Main Board ...
Page 34: ...34 V50 109B5 Control Panel board C B A 9 Go to cover page ...
Page 36: ...36 V50 109B5 MHR board C B A 9 Go to cover page ...