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Panasonic HTB4152B/12 Service Manual page 20

Home theater soundbar

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Tuner FM does not work
Tuner FM does not work
Go
Check voltage at U17 PIN1 (+5V) on
Main Board whether normal or not
Yes
Check voltage +3.3V at Tuner IC
(Pin2) whether right or not
Yes
Check Tuner module IC Pin14,
Pin15 normal or not
Yes
Check the U8
output on Main Board normal or not
Yes
Replace main Board
PIN25, PIN26, I2C
5-7
No
Check whether U6 and U7 work good
or not? And fix it or replace the AM
board.
No
Check Main Board tuner power supply
circuit.
Change the Tuner IC
No
Check
Main
No
supply circuit
Trouble shooting Chart
Board
U4
power

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