5-2 Trouble shooting Chart
LED no display on LED
yes
no
yes
no
yes
no
yes
no
yes
Check every supply voltage on
main board whether normal or
not
+18V +5V +3.3V +1.25V
check the power supply board
Check every supply
voltage on front board
whether normal or not
check the FFC connector from
main board to front board
Check every supply
voltage on the LED Driver
Pin25 +5V
Replace the R17
Check the LED Display whether
normal or not
Check the LED Driver
whether normal or not
Replace the U2
no display on LED
Summary of Contents for HTL4111B/12
Page 43: ...USB MP3 board Print Layout bottom and top side 7 14 7 14 ...
Page 44: ...Front Control and Key board Print Layout bottom side 7 15 7 15 ...
Page 45: ...Front Control and Key board Print Layout Top side 7 16 7 16 ...
Page 46: ...Power board Print Layout Bottom side 7 17 7 17 ...
Page 47: ...Main board Print Layout Bottom side 7 18 7 18 ...
Page 48: ...Main board Print Layout Top side 7 19 7 19 ...