Philips 202P4 - Page 94

Repair Flow Chart
86
202P4 M25P
9
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E. CPU
check list
check cpu pin6=5V
pin9/pin8=12MhZ
pin12/pin31=gnd
power saving pin20 pin27
normal hi hi
off low low
33,34,40,41
Hsync/Vsync
18. Hunlock
check sync.
hin=pin40
vin=pin41
hout=pin34
vout=pin33
check pin4 duty cycle of
pwm from 0% to 100%
Basic Check
2. H-Centering
check Q1~Q6
Pin10~15
low:0
hi :1
3. ABL-Adj
4. H-linearity
Pin10~15 (S6~S1)
S-cap switch
check pin3 duty cycle of
pwm from 0% to 100%
check pin2 duty cycle of
pwm from 0% to 100%
1. Normal
Fvout=Fvin
FHout=FHin
2. sync out of rang
Fhin>131.5KHz
Fvin>168Hz
check pin18
normal=Low
blank=Hi
20,27 P.S.
LED
check pin20/27
19. Blank
check pin19
normal : low
change timing : Hi
202P130K S - CAPACITOR SWITCH TABLE
Hor. Freq.(KHz)
Q7 Q6 Q5 Q4 Q3 Q2 Q1
~33.00
1 111111
33.00~36.00
0 111101
36.00~42.00
1 011001
42.00~45.00
1 011110
45.00~47.50
0 100110
47.50~49.00
0 111010
49.00~52.00
0 001010
52.00~55.00
1 010010
55.00~58.50
0 100010
58.50~61.50
1 101100
61.50~65.00
1 110100
65.00~70.00
0 010100
70.00~73.00
1 000100
73.00~76.00
0 111000
76.00~80.60
1 011000
80.60~82.50
1 101000
82.50~84.80
0 101000
84.50~88.50
1 001000
88.50~92.50
0 001000
92.50~98.00
1 110000
98.00~102.00
0 110000
102.00~110.00
1 010000
110.00~113.50
1 100000
113.50~122.00
0 100000
122.00~126.50
1 000000
126.50~
0 000000
note: bit0àQ1,bit1àQ2,bit2àQ3,bit3àQ4,bit4àQ5, bit5àQ6, bit6àQ7
Q1: Scapacitor1, Q2:Scapacitor2, Q3:Scapacitor3, Q4:Scapacitor4, Q5:Scapacitor5,
Q6:Scapacitor6, Q7:Scapacitor7