Sharp LC-70UD1U Service Manual page 67

Is triangular wave pulse sent to
TP9066 (VSOUT)?
YES
Go to the section "T-Con operation
check ."
Is the signal (LVDS) sent to pin 5 of
L5401?
YES
Go to the section "T-Con operation
check ."
FRC operation check
Is 1.5 V applied to pin 2 of FB9020?
Is 2.5 V applied to pin 2 of FB9004?
Is 1.05 V applied to pin 2 of FB9005?
NO
Is 3.3 V applied to pin 2 of FB9013?
YES
Is 1.5 V applied to pin 2 of FB9420?
Is 2.5 V applied to pin 2 of FB9404?
Is 1.05 V applied to pin 2 of FB9405?
Is 3.3 V applied to pin 2 of FB9413?
YES
Do X9001 and X9401 oscillate at 27 MHz?
YES
The programs of IC9002/IC9402 may be
damaged, or IC9002/IC9402 may be cor-
rupted.
Replace IC9002/IC9402 or rewrite the
ROM.
LVM operation check
Is 1.2 V applied to pin 3 of FL5401?
Is 2.5 V applied to pin 3 of FL5402?
NO
Is 3.3 V applied to pin 3 of FL5403?
YES
Is CLK (Vx1) sent to pin 2 of R5547?
YES
The program of IC5402 may be damaged,
or IC5402 may be corrupted.
Replace IC5402 or rewrite the ROM.
6 – 23
Check the operation of IC6007.
Check the operation of IC8102.
Check the operation of IC8104.
NO
Check the operation of IC8105.
Check the operation of IC6007.
Check the operation of IC8102.
Check the operation of IC8104.
NO
Check the operation of IC8106.
Check the operation of IC9001
and IC9401.
NO
Check the operation of IC6002,
IC6007 and IC6013.
NO
Check the operation of IC4901
(Vx1-Rx).
NO
LC-70UD1U