Keys
do not work
keysdo
notwork
Go
No
Replacethe
oldwiththenewKEYboard
totheEUTworking.yesornot?
Yes
Replacethe
keyboard.
No
Yes
Checkfromm
ainboardtheSTB_3V3
powersupplyisnormal?yesornot?
Check6pincab
le(XP6)tomainboardof
connectyesornot.?
Insteadofne
w6pinline
CheckKEYsig
nalfromMCUmodule(U11)
inmainboard.
Yes
No
Replacethe
MCUpartorotherloadparts
Che
ckthemainboardtheMCUmodule
(U6)othersupplynetworkload
par
ts(
for
example:STB_3V3_MCU).
Yes
ReplacePCBAformainbo
ard.
No
5-1