Philips V40 109B6 - Page 80

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109B6 CRT
Repair Flow Chart
80
E.CPU
Check List
1. BasicCheck
Check CPU pin6/pin5=5v
pin8/pin9=12MHZ
4.H-Linearity
Check pin4
pwmfromOVto 5V
2.H-Centering
Check pin2
pwmfromOVto 5V
19. Blank
Check pin19
normal: low
chang timing: Hi
14~10
(Q5,Q4,Q3,
Q2,Q1)
S-cap switch
Check Q1-Q5
Low:0
Hi:1
3. ABL -Adj
Check pin3
pwmfrom0Vto 5V
18. Hun lock
Check pin18
normal=Hi
blank=low
20,27,P.S.
LED
CHECK PIN20/27
Pin27 pin20
normal hi hi
off low hi
109B6 S-CAPACITOR SWITCH TABLE
Hor.Freq(KHZ) Q5 Q4 Q3 Q2 Q1
~33.24 0 0 0 0 0
33.24~36.51 0 0 1 1 1
36.51~40.60 0 1 1 0 0
40.60~45.07 1 0 0 0 0
45.07~47.62 1 0 0 1 1
47.62~51.49 1 0 1 1 0
51.49~55.07 1 0 1 1 1
55.07~61.96 1 1 0 0 0
61.96~66.29 1 1 0 1 0
66.29~74.32 1 1 0 1 1
74.32~82.96 1 1 1 0 1
82.96~89.00 1 1 1 1 0
89.00~0Xffff 1 1 1 1 1