5-7 Trouble shooting Chart
Tuner FM does not work
Tuner FM does not work
Go
Yes
Check whether U6 and U10 work good
or not? And fix it or replace the main
board.
No
Check Main Board tuner power supply
circuit.
No
Change the Tuner IC
No
Yes
Yes
No
Yes
Replace main Board
Check
Main Board U4 power
supply circuit
Check v3.3V at Tuner IC
(Pin2) whether right or not
Check Tuner module IC Pin14,
Pin15 normal or not
Check voltage at Q28 C
electrode
(+5V) on Main Board whether normal
or not
Check the U8 PIN25, PIN26, I2C
output on Main Board normal or not
Summary of Contents for HTB5540D/94
Page 13: ...3 4 5 1x 2 3 ...
Page 21: ...X AUDIO IN 2 1 1 3 5MM STEREO 3 USB 2 2 11 ...
Page 22: ...X 1 LAN LAN 1 2 3 2 12 ...
Page 46: ...7 8 7 8 Touch Board Print layout bottom side ...
Page 47: ...7 9 7 9 Touch Board Print layout top side ...
Page 48: ...7 10 7 10 Front Control Board Print layout bottom side ...
Page 49: ...7 11 7 11 Front Control Board Print layout top side ...
Page 50: ...7 12 7 12 Power Board Print layout ...
Page 51: ...7 13 7 13 Amplifier Board Print layout bottom side ...
Page 52: ...7 14 7 14 Amplifier Board Print layout top side ...
Page 57: ...10 1 10 1 Exploded View for HTB5540D 12 94 93 ...
