LL-T17D4H (serv.man6). Trouble shooting - Sharp Monitor Service Manual (repair manual). Page 3

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LL-T17D4-H/B
TROUBLE SHOOTING
5 – 3
6. Function key can not work
YES
 
NO 
IC301 failure 
YES
NO 
KeyBoard failure
Check wire harness
is connected form I/F
board to Key
Check voltage of IC301
pin38, 39, 40, 41, 42, 43 while key is
pressing
INPUT
MENU
MODE/DOWN
LEFT
RIGHT
Power-ON/OFF
The key cable is disconnected
7. No Sound
Check IC801 Pin15, 16 is approximately 12V
Check IC801 Pin 12 is Low voltage
YES 
YES 
NO 
NO 
YES  
NO  
NO 
YES 
NO 
Earphone output normal
The speakers are failure
CN805 is failure
The cable is deiconnected
Check wire harness is connected
from CN804, CN802 to earphone board
IC801failure
D807 failure
IC301failure
(Test signal: Vrms sine waveform)
Adjust VOLUME to max and check
IC801 pin 14, 17
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