Repair Flow Chart; Main Board - Philips Magnavox 15MF400T/37 Service Manual

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15" LCD-TV Color Monitor

5.Repair Flow Chart

5.1. Main board

No Screen
Check U104 pin 1=12V
Yes
Check U104 pin2=5V?
Check U101、 U102、 U103
pin3=5V?
Yes
Check FB102=3.3V
Check FB103=1.8V
Check FB109=3.3V
Yes
Check panel Vcc
Yes
Check FB108=3. 3 V
Check U402 pin34=3.3V
Yes
Check Q102 pin1=0.6V
Yes
Check Q102 pin3=0V
Yes
Check Q105 pin5~pin8=3.3V
No
1、 Check U104 pin1 short?
2、 Check CN102 input=12 V
No
Replace U104
No
1、Check Power is shorted with ground
2、Replace U101/U102/U103
No
Check MCU
work status
No
Replace Q102
No
Replace Q105
Check U201 Decoder power Vcc
Check Q106 pin7, 8=3. 3 V
Check U402 pin37=3. 3 V
Yes
Check Q103 pin 1=0.6 V
Check Q104 pin 1=0.6 V
Yes
Check Q103 pin 3=0 V
Check Q104 pin 3=0 V
Yes
Replace Q106
21
15MF400T/37
No
Check MCU work
status
No
Replace Q103
Replace Q104

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