68
107P2 CM 25 GSIII
A. Power Supply Failure
1. Symptom :
no startup sound
LED light off
check 7106 pin1
100V<pin1<380V
check 7106
pin14 > 2V
Ok
NO
check 7106
pin 8=2.4V
3131=24kohm
check
1101/6102/
7105
Ok
NO
check
3121/3122/1106
3124/2121/3136
replace 7106
NO
check 7106
pin4 output ?
OVP possibly active
check 6115
2. Symptom :
hicup mode with
startup sound or
blinking LED
OPP possibly active
check 3115,3116,
3117,3118,6116,3127
check 7106
pin 6 < 13.5V
check 7103
open circuit
Ok
replace 7106
check
6165/3113/
3114/7105
Ok
NO
OK
No
replace 5101
No
check 7153 pin3
voltage dip
check 7153 pin1
12V< pin1 < 15V
check 7106
pin 5 < 0.5V
OK
check
6162/3170/3171
3173/7157/2165
No
check
+5V loading current
Turn power off
check the resistance for
all output v180,
80,13,-13,-6.1,+5,+8 V
check 6148~6159 short?
replace 5101
check
7157/7155/7113/7154
3. Symptom:
abnormal sound
check 7105
drain waveform
right?
check
frequency
F=72.5KHZ
check
3131=24K
No
Ok
Ok
No
check
6103/3111/6103/
6108/2128/3112
replace 5101
No
OK
7106 pin14 OOB
possibly active
short 7155 pinC
check CPU pin 22
and 7805 emitter
Ok
No
Ok
check
3128/6107
/6115
check
pin6>8V
Repair Flow Chart