Sharp LC-R60HDU Service Manual page 39

TROUBLE SHOOTING TABLE
Checking LCD drive PWB
Are there output signals at
pins (1), (3), (5), (7) and (9)
NO
of LA: TP1448 [G], TP1449
[B], TP1450 [R], TP1451 [H]
and TP1452 [V]?
YES
NO
Is power supplied?
YES
Are there output signals at
NO
TP1439 [R], TP1443 [G],
TP1446 [B], TP1425 [H] and
TP1426 [V]?
YES
NO
Are there signals at TP1804
[R], TP1805 [G] and TP1806
[B]?
YES
NO
Are there signals at pins (36),
(32) and (21) of IC1801?
YES
Are there signals at
NO
TP1807 (R), TP1808 (G)
and TP1809 (B)?
YES
B
Check LA connection
cable.
Check output voltages at
EA, IC1701 thru IC1716,
and IC1722.
Check IC1401 and its
peripheral circuits.
Check IC1801 and its
peripheral circuits.
TP1807 [R] in trouble
Check IC1802, IC1805,
IC1808, IC1811, IC1812,
IC1817, IC1818, IC1823,
IC1824 and their peripheral
circuits.
39
(Continued)
Checking PLL and clock
circuits.
Are there waveforms at pins (21),
(20), (7) and (15) of IC1014?
YES
Are there clock signals at pins
(13) and (14) of ADC on IC1402,
IC1403 and IC1404? Are there
clock signals also at pins (17),
(20) and (21) of DAC on IC1006,
IC1007 and IC1008?
YES
Check LCD driver and γ IC.
Are there high-level output
signals at IC1001 and IC1020?
YES
TP1808 [G] in trouble
Check IC1803, IC1806,
IC1809, IC1813, IC1814,
IC1819, IC1820, IC1825,
IC1826 and their peripheral
circuits.
LC-R60HDU
NO
Check IC1041 and its
peripheral circuits.
NO
Check IC1009, IC1010,
IC1011, IC1012, IC1013
and their peripheral
circuits.
NO
Check IC1001, IC1020 and
their peripheral circuits.
TP1809 [B] in trouble
Check IC1804, IC1807,
IC1810, IC1815, IC1816,
IC1821, IC1822, IC1827,
IC1828 and their peripheral
circuits.