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1
A
Does not the picture come out when DTV is received?
TERMINAL UNIT:
Is the voltage of regulation for a TUNER circuit and the power
supply terminal of IC7507 (COFDM) supplied?
(Refer to the circuit diagram)
Is IF signal output from pin (20), (21) of TUNER (TU7501) to pin
(30), (30) of IC7507 (COFDM)?
B
TERMINAL UNIT:
Similarly, is communication control carried out between pin
(14),(15) of TU7501, and pin (4), (5)of IC7507?
D
o
e
s
X
7
5
0
2
2 (
0
4 .
8
M
H
) z
o
s
Is MPEG data (FECLK, FED_D, FESTR_PSYNC, FEVAL_DEN)
C
from IC7507 are output to pin (1)/FECLK, (3)/FED_D of a con-
nector (P7501) and pin (51)/FESTR_PSYNC, (50)/FEVAL_DEN
of a connector (SC501)?
MAIN UNIT:
Is the digital signal input into pin (1)/FECLK, (3)/FED_D of a con-
nector (P1103) and pin (51)/FESTR_PSYNC, (50)/FEVAL_DEN
of a connector (SC1101)?
Is the digital signal input into pin (AF3)/FECLK, (AF2)/ FED_D,
(AF4)/FESTR_PSYNC, (AH3)/FEVAL_DEN of IC8101 (CPU/
DECODER)?
D
Do X8101 (24.00MHz)/ X8102 (32.768kMHz) oscillate?
Are video signal VDB_R [0:9], VDB_G [0:9], VDB_B [0:9], and
VBD_CLK/DE/HD/VD are output from IC8101 to IC3301 (VIDEO
PROCESSOR)?
Refer to "The picture doesn't appear in all modes."
E
F
44
1
2
No picture on the display (3)
YES
YES
YES
i c
a l l
e t
?
YES
YES
YES
YES
YES
YES
2
3
NO
Each power supply circuit is checked.
NO
Check the tuner, IC7507 and their peripheral circuits.
Replace as required.
NO
N
O
C
h
e
c
k X7502 and its peripheral circuits.
NO
Is the control signal named IC7507 and IC9101 (CPLD) normal?
(FE_RST_LINE, FEERR_LINE, FEPG0_COMP_LINE,
FEPG1_LOCK_LINE, etc.)
NO
Connector SC501/SC1101 and P7501/P1103 are checked.
NO
Check the line between SC1101,P1103 and IC8101.
NO
Check the X8101/ X8102 and their peripheral circuits.
NO
Check IC8101, IC3301 and their peripheral circuits.
(IC8301-IC8304 (DDR2_SDRAM), etc.)
KRL-46V
3
4
4
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