Advertisement
TROUBLE OF DC-DC CONVERTER
J1 PIN 9,10,11
U14 pin 5 6 7 8
U15,U17,U22 pin2
CONFIDENTIAL
DO NOT COPY
–
Start
J1
Yes
Yes
Yes
Yes
U21 pin2
Yes
U19 pin2
Yes
U16 pin3
END
N0
The voltage is about +5V (+5VSB)
1. Check power board
2. Check power cable, F4 & connection J1
3. Check U22 pin3 (+5VSB) & pin2 (+3V3SB)
The voltage is about +5V while power switch on
N0
1. Is J1 connection good
2. Check J1Pin9 is up to about 5V?
3. Check F15_ON is logic "H" (L90)
4. Check +15V at DC-DC Converter Board (L701)
N0
The voltage is about +5V while power switch on
1. Check F4 & U14
2. Check OPWRSB is logic "H" (R10)
3. Check U14 pin1 & 3 is low 0.8V
N0
The voltage is about +3.3V
1. Check U15,U17,U22 pin 2
The voltage is about AV1.2V while power switch on
N0
1. Check U21
2. Check U19 pin2
N0
The voltage is about AV(+2.5V) while power switch
on
1. Check J1 Connect
2. Check U19 pin2
N0
The voltage is about +12V to +5V_Tuner while
power switch on
1. Check F2
2. Check U16 pin1 (+12V) & pin3 (+5V_TUNER)
Page 9-5
File No. SG-0279
Advertisement
