Philips V30 107T50 Service Manual page 78

78 107T5
9
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4. Rotation
29. ABL
23. Keypad
24. Selftest
25,26. DDC bus
31,32. IIC bus
EEPROM
30. H-linearity
Repair Flow Chart (Continued)
check
output from 0V to 5V
check
output from 0V to 5V
check key Power, Ok, LF,
Brightness and contrast keys
check pin24
1.no H/V sync & IF cable pin5 floating
2.H/V sync exist & IF cable pin5 to ground
3.H/V sync non-exist & IF cable pin5 to gnd
4.After 1892&1893 pressed on, then power on
(1895) with IFcable pin5 =L
5.After 1892&1893 pressed on, then power on
(1895) without IFcable pin5=H
check idle status
sda=pin25=hi
scl=pin26=hi
check idle status
sda=pin32=hi
scl=pin31=hi
check 7802 pin 7
Low : write enable
Hi : write disable
check
output from 0V to 5V
check 3891~3894
- show msg.
- normal
-power saving
-factory mode
-burn in mode
check
7802 M24C16
7501 TDA9112A
7331 NT6812K