Philips V40 109B6 - Repair Flow Chart; Power Supply Failure Troubleshooting

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109B6 CRT
Repair Flow Chart
76
A. Power Supply Failure
1.symptom:
no startup sound
LED light off
Check 7102pin8
140v<pin8<360v
NO
Replace 7102
Check 7102
pin1+11v
Check 7102
pin6 output?
No
Ok
No
Check 1101/6101/
7101
Check
6113/3125/
3105
Replace 7102
2. Symptom :
hiccup mode with
startup sound or
blinking LED
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 7102
pin 5
No
OCP possibly active
check 3108,3109,
3110,6106,3113
replace 5113
check 7114pin1
7.5V< pin1 <8V
Ok
check 7114pin3
voltage dip
check
6146/3153/7115
3154/7116/2142
check
+5V loading current
No
check
6103/3104/
2111/3131
replace 5113
check 7101
drain waveform
right?
check
frequency
F=30KHz~97KHz
3. Symptom:
abnormal sound
OK
OK
NO