Philips 32PFL3605/77 Service Manual page 25

Service Modes, Error Codes, and Fault Finding
DC/DC converter
Start
J1 PIN6, 7, 8
J1 PIN 9, J2 PIN 1/2
Q28 PIN 7, 8
U4 PIN 5, 6
U2 PIN 5, 6
U1 PIN2,4
U3 PIN 3
U38 PIN 2, 4
U9, U39 PIN 3
T CON-U32 PIN2
T CON-U35 PIN 3
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Figure 5-16 DC/DC converter [1/2]
RAM1.0L LA
The voltage is about +5V
1. Check power board
2. Check power cable connection J1
The voltage is about +12V while power switch on
1. J1/J2 connection good
2. Check power board
The voltage is about +5V while power switch on
1. Check Q27-Gate B
The voltage is about +3.3V
1. Check U4 PIN2 EN
The voltage is about +1.0V
The voltage is about +1.8V
The voltage is about +1.2V
The voltage is about +3.3V
The voltage is about +5V
The voltage is about +12V
The voltage is about +3.3V
5. EN 25
18930_218_100310.eps
2010-Jul-02