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No display on LED, and buttons do not work
Check
connected to SW1, SW2, are
broken. And test the signal of
SW3 ,SW4 connected to PIN7 and
PIN8 is OK.
Replace
No display on LED, and
buttons do not work
Yes
Check
every
supply
voltage on main board is
normal(Pin 6 and pin9 is
5v in xs1 on front board)
Yes
Check the front board
signals VSTB, VCLK,VD,
(XS1:pin1,2,3)
Yes
whether
the
circuit
Yes
SW1
SW2, SW3, SW4
4-1
No
No
Check the connect line is OK
1.Correct connection or whether test the
No
voltage of PIN7 and pin21 of U301 is 5v.
2.change the U301(ET6202).
Trouble shooting chart
Check whether the
connction of line is
ok.
NO
Fix it
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