Sharp LC-70UD1U, Service Manual

Page: 66 / 84

LC-70UD1U
6 – 22
LSE1 sync signal check
Is triangular wave pulse sent to
TP3004, TP3007, TP3010 and
TP3013?
NO
Is 1.2 V applied to pin 3 of FL3001?
Is 2.5 V applied to pin 3 of FL3002?
Is 3.3 V applied to pin 3 of FL3003?
NO
Check the operation of IC6003
and IC6009.
YES YES
Go to the section "LSE2 sync signal
check." Are signals (LVDS) supplied to pins 3 and 4
of IC5201?
NO
Go to the section "DRC check "
or "CLKGEN check ."
YES
The programs of IC3002/IC3006 may be damaged, or IC3002/IC3006 may be corrupted.
Replace IC3002/IC3006 or rewrite the ROM.
LSE2 sync signal check
Is triangular wave pulse sent to
TP3404, TP3407, TP3410 and
TP3413?
NO
Is 1.2 V applied to pin 3 of FL3401?
Is 2.5 V applied to pin 3 of FL3402?
Is 3.3 V applied to pin 3 of FL3403?
NO
Check the operation of IC6003
and IC6009.
YES YES
Go to the section "DRC check ."
Are signals (LVDS) supplied to pins 3 and 4
of IC5203?
NO
Go to the section "DRC check "
or "CLKGEN check ."
YES
The program of IC3402 may be damaged,
or IC3402 may be corrupted.
Replace IC3402 or rewrite the ROM.
DRC operation check
Is triangular wave pulse sent to
TP4327(IVSYNC),
TP4329(OVSYNC)?
NO
Is 1.8 V applied to pin 2 of FB4308?
Is 1.2 V applied to pin 2 of FB4311?
Is 3.3 V applied to pin 2 of FB4312 and
FB4313?
Is 1.8 V applied to pin 2 of FB4305?
NO
Check the operation of IC6006,
IC6007 and IC6008.
YES YES
Go to the section "LSE1 sync signal
check" or "LSE2 sync signal check."
Is the signal (LVDS) sent to pin 5 of L5401?
NO
Go to the section "CLKGEN
check ."
YES
Go to the section "LVM operation check."
CLKGEN operation check
Is the 27 MHz frequency sent to
TL4807, TL4810 and TL4817?
Is the 37.125 MHz frequency sent to
TL4816?
NO
Is 3.3 V applied to pin 2 of FB4802?
NO
Check the operation of IC6007.
YES YES
Go to the section "FRC operation
check."
Does X4801 oscillate at 27 MHz?
NO
Check the operation of IC4804.
YES
The program of IC4804 may be damaged,
or IC4804 may be corrupted.
Replace IC4804 or rewrite the ROM.