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Dell P1230 M25P
82
9
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E. CPU
Basic Check
check list
4. H-linearity
2. H-Centering
19. Blank
Pin10~15 (S6~S1)
S-cap switch
3. ABL-Adj
33,34,40,41
Hsync/Vsync
18. Hunlock
20,27 P.S.
LED
Repair Flow Chart
check cpu pin6=5V
pin9/pin8=12MhZ
pin12/pin31=gnd
check pin4 duty cycle of
pwm from 0% to 100%
check pin2 duty cycle of
pwm from 0% to 100%
check pin19
normal : low
change timing : Hi
check Q1~Q6
Pin10~15
low : 0
hi :1
check pin3 duty cycle of
pwm from 0% to 100%
1. Normal
check sync.
hin=pin40
vin=pin41
2. sync out of rang
hout=pin34
vout=pin33
check pin18
normal=Low
blank=Hi
power saving pin20 pin27
check pin20/27
normal
off
202P130K S-CAPACITOR SWITCH TABLE
Hor. Freq.(KHz)
Q7
Q6
Q5
~33.00
1
1
1
33.00~36.00
0
1
1
36.00~42.00
1
0
1
42.00~45.00
1
0
1
45.00~47.50
0
1
0
47.50~49.00
0
1
1
49.00~52.00
0
0
0
52.00~55.00
1
0
1
55.00~58.50
0
1
0
58.50~61.50
1
1
0
61.50~65.00
1
1
1
65.00~70.00
0
0
1
70.00~73.00
1
0
0
73.00~76.00
0
1
1
76.00~80.60
1
0
1
1
1
0
80.60~82.50
82.50~84.80
0
1
0
84.50~88.50
1
0
0
88.50~92.50
0
0
0
92.50~98.00
1
1
1
0
1
1
98.00~102.00
102.00~110.00
1
0
1
110.00~113.50
1
1
0
113.50~122.00
0
1
0
122.00~126.50
1
0
0
0
0
0
126.50~
note: bit0àQ1,bit1àQ2,bit2àQ3,bit3àQ4,bit4àQ5, bit5àQ6, bit6àQ7
Q1: Scapacitor1, Q2:Scapacitor2, Q3:Scapacitor3, Q4:Scapacitor4, Q5:Scapacitor5,
Q6:Scapacitor6, Q7:Scapacitor7
Fvout=Fvin
FHout=FHin
Fhin>131.5KHz
Fvin>168Hz
hi
hi
low
low
Q4
Q3
Q2
Q1
1
1
1
1
1
1
0
1
1
0
0
1
1
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
0
0
1
0
0
0
1
0
1
1
0
0
0
1
0
0
0
1
0
0
0
1
0
0
1
0
0
0
1
0
0
0
1
0
0
0
1
0
0
0
1
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
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