Akai LTC-32R5W4HCP, Руководство по обслуживанию

Страница: 18 / 39

Getting rid of function's trouble
9.fuction part
（
DVB
-
T
）
no DVB
-
T
'
S picture
16
MANI BOARD FAULT JUDGMENT
Maintenance Q23
，
U23
and U25 have damaged?
U25 have the 3.3V?
DVB-T don't display the picture .
U15 crystal have the shake
？？
PIN22 of the
U15 resettin g pin have the signal ?
？
between
the U15 and I2C of U18commucatio n is OK
？？
Mainten anc e U26 and the relative ne twork
Maintenance the PIN22 of X2
，
R335
，
R336
，
U15 or replace U15
N
Y
N
L13
，
L14
，
L15
，
L16
port have the output
Replace ZR3916X main IC
Y
N
U26 have 1.8V?
Maintenance X3
，
R323 relative
c o m p o n e n t a n d n e t w o r k
U18 cr ystal have the shake?
resetting pin have the signal ?
RN9
，
RN10
，
RN11 the
rule signal output ?
Y
N
N
Y
Mai nt ena nce RN 9, RN 10, RN 11, wel d ag ai n
Maintenance C109
，
E10,E11,E12,
U5
,
U5
'
s PIN1
，
PIN15 select level
N
Y
Y