No display on LED, and buttons do not work
No
No
Yes
Yes
No display on LED, and
buttons do not work
Check XP3 pin14
It should be 5V
Check the main board SPI signal
(U20 :pin17,18,19)
Correct connection
Replace U301 or LED
Yes
NO
No
Check the front board
signals
VSCLK,VSDA,VSTB
(XP3 : pin9,10,11)
1.Check the LED board
whether bad solder exists on
U301 and pins of LED
2.Check whether the circuit
connected to S608, S609,
S610, S611 are broken.
Check Q751 in
main board
Replace Q751
Yes
NO
Replace Main Board
Trouble shooting chart
5- 1
Summary of Contents for HTD5540/12
Page 42: ...7 11 7 11 Front Control Board print layout ...
Page 43: ...7 12 7 12 Power Board print layout ...
Page 44: ...7 13 7 13 Main Board print layout bottom side ...
Page 45: ...7 14 7 14 Main Board print layout top side ...
Page 48: ...SPHE8203R Rx MAIN IC BLOCK DIAGRAM 9 1 ...
Page 49: ...SPHE8203R Rx SIGNAL DESCRIPTION Pin Configuration 9 2 ...
Page 53: ...10 1 10 1 Exploded View for HTD5540 12 93 ...
Page 54: ...Exploded View for HTD5510 94 HTD5540 94 HTD5570 94 10 2 10 2 ...
Page 55: ...Exploded View for HTD5510 98 HTD5540 98 HTD5570 98 10 3 10 3 ...
Page 56: ...1 1 1 Revision List Version 1 0 γ Initial Release for HTD5540 12 98 94 93 ...