2008-03-14
LC-26SB25E/S/RU, LC-32SB25E/S/RU, LC-42SB55E/S/RU
45
No picture on the display (3)
↓
Does not the picture come out when DTV is received?
TERMINAL UNIT: ↓
↓YES
TERMINAL UNIT: ↓YES
↓YES
↓YES
MAIN_UNIT: ↓YES
↓YES
↓YES
Is IF signal output from pin (17), (19) of TUNER (TU200) to pin (43),
pin (44) of IC U231 (COFDM)?
Is the voltage of regulation for a TUNER circuit and the power
supply terminal of IC U231 supplied?
NO
Each power supply circuit is checked.
NO
Check the tuner, IC U231 and their peripheral circuits. Replace
as required.
Similarly, is communication control carried out between pin
(6)(SCL), pin(9)(SDA), pin(12)(AGC) of TU200, and pin(38), pin
(37), pin(35) of IC U231?
NO
Does Y230 (27MHz) oscillate?
NO
Check Y230 and its peripheral circuits.
NO
Is MPEG data (TS0INDATA[0..7], TS0INSYNC, TS0INCLK,
TS0INVALID) from IC U231 are output to pin
(6/7/8/9/11/12/13/14/16/17/18) of a IC U401?
Is the control signal between IC U231 and IC U400 normal?
(CHN_DEC_RESET, MAIN_SDA, MAIN_SCL, etc.).
Is MPEG data (TS_DATAO, TS_CKO, TS_VALIDO, TS_SYNCO)
from IC U401 are output to pin (A26/D23/C24/B26) of a IC U400?
NO
Is the control signal between IC U401 and IC U400 normal?
(RESET_CI, etc.).
Do X300 (60.00MHz)/ X400 (27MHz) oscillate?
NO
Check X300/ X400 and its peripheral circuits.
Refer to “The picture doesn't appear in all modes.”
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