Repair Flow Chart - Philips V50 109B5 Service Manual

V50 109B5
44
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A. Power Supply Failure
1. Symptom :
no startup sound
LED light off
2. Symptom :
hiccup mode with
startup sound or
blinking LED
3. Symptom:
abnormal sound

Repair Flow Chart

check 7102 pin8
140V<pin8<360V
NO
replace 7102
replace 7102
Turn power off
check the resistance for
all output voltages+190,
83,12,-12,+6.3,+5,+8 V
check 6131,
6133~6136 short?
check 7114 pin3
Ok
voltage dip
check
+5V loading current
check
frequency Ok
F=30KHz~97KHz
check 7102
pin 1=11V
NO
check
1101/6101/
7101
OCP possibly active
check 3108,3109,
3110,6106,3113
check 7114 pin1
7.5V< pin1 < 8V
No
check
6146/3153/7115
3154/7116/2142
check 7101
drain waveform No
right?
Ok
replace 5113
check 7102
Ok
Pin6 output ?
Ok
check
6113/3125/
3105101
check 7102
pin 5
No
OK
replace 5113
check
6103/3104/
2111/3131
NO