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68
107P2 CM 25 GSIII
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A. Power Supply Failure
1. Symptom :
no startup sound
LED light off
2. Symptom :
hicup mode with
startup sound or
blinking LED
check
7157/7155/7113/7154
3. Symptom:
abnormal sound
Back
Repair Flow Chart
check 7106 pin1
Ok
100V<pin1<380V
NO
check
1101/6102/
3121/3122/1106
7105
3124/2121/3136
replace 7106
Turn power off
check the resistance for
all output voltages+180,
80,13,-13,-6.1,+5,+8 V
check 6148~6159 short?
check 7103
No
open circuit
check 7153 pin3
Ok
voltage dip
check
+5V loading current
check
frequency
Ok
F=72.5KHZ
No
check
3131=24K
check 7106
check 7106
Ok
pin 8=2.4V
pin14 > 2V
3131=24kohm
NO
NO
check
replace 7106
check
3128/6107
/6115
check 7106
OK
pin 6 < 13.5V
No
OVP possibly active
check 6115
OK
replace 5101
check 7153 pin1
No
12V< pin1 < 15V
No
check
6162/3170/3171
3173/7157/2165
check 7105
drain waveform
No
right?
Ok
replace 5101
check 7106
Ok
pin4 output ?
Ok
check
6165/3113/
3114/7105
check
pin6>8V
check 7106
pin 5 < 0.5V
No
OPP possibly active
check 3115,3116,
3117,3118,6116,3127
OK
replace 5101
7106 pin14 OOB
possibly active
short 7155 pinC
Ok
check CPU pin 22
and 7805 emitter
check
6103/3111/6103/
6108/2128/3112
Forward
NO
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