LG HT503TH Service Manual page 11

2. Front circuit (1/2)
Power on.
YES
Blue LED turn off?
YES
Is the Digitron on
correctly?
YES
Check if all
buttons are ok?
YES
Check if the remote
control is ok?
YES
Front B/D ok.
*1 : PN206 Pins.
PIN1 : -34 VKK, PIN2 : -28 FL+, PIN3 : -32 FL-,
PIN12 : +5VA, PIN13 : +5V
LGE Internal Use Only
NO
Check if
PN302 is ok?
NO
Check if the front
power is ok?(*1)
NO
1
NO
2
Check if
DIS301 is ok?
2-2
NO
YES
NO
YES
NO
Check pattern and resoldering
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Reconnect it.
Refer to SMPS part.
Only for training and service purposes