Sharp LC-30HV4E (serv.man10) Service Manual ▷ View online
60
LC-30HV4E
TROUBLE SHOOTING TABLE
(Display)
LCD LED: ON
AVC-C LED: OFF
Check power switch, AC power cable and power unit of AVC-C.
LCD LED: OFF
AVC-C LED: ON
Check power switch, AC power cable and power unit of LCD.
LCD LED: BLINKING
(Once per second)
Check system cable, power switch, AC power cable and power unit of AVC-C.
LCD LED: BLINKING
(4 times per second)
Check cooling fan, IC2102 and peripheral circuits.
LCD LED: ON IN RED
AVC-C LED: ON IN RED
LCD LED never turns to
green.
Check power switch, AC power cable and power unit of LCD.
AVC-C LED never turns
to green.
Check power switch, AC power cable and power unit of AVC-C.
LCD panel backlight
never lights up.
Reset the lamp error count. (See adjustment procedure.)
Check Q6551, Q6554, Q6557, Q6560, Q6563, and Q6566 as well as peripheral circuits.
Initialize EEPROM. (See
adjustment procedure.)
If not successful: Check power switch, AC power cable and power unit of LCD.
No Power
61
LC-30HV4E
TROUBLE SHOOTING TABLE
(Continued)
(Display)
No 800-MHz signal input at pins (186), (187), (191), (192), (196) and (197) of IC2201.
No signal output from pins (95), (96) and (97) of IC2201.
Check IC2201 and peripheral circuits.
Is each pin normal at IC4701?
Faulty: Check IC4701 and peripheral circuits.
Is each pin normal at IC4901?
Faulty: Check IC4901 and peripheral circuits.
Is each pin normal at IC4551?
Faulty: Check IC4551 and peripheral circuits.
Check SC4501, -4502, -4503 and -4504 and their cables.
Check outputs of main unit and headphone.
Is signal waveform normal at Q2105 and Q2106?
Faulty: Check Q2105 and Q2106 and peripheral circuits.
Is signal waveform normal at IC3802 and IC3804?
Faulty: Check IC3802 and IC3804 and peripheral circuits.
Is signal waveform normal at IC3805, IC3806 and IC3807?
Faulty: Check IC3805, IC3806 and IC3807 and peripheral circuits.
Check IC3809 and peripheral circuits.
1
No Picture
2
No Sound
61
LC-30HV4E
TROUBLE SHOOTING TABLE
(Continued)
(Display)
No 800-MHz signal input at pins (186), (187), (191), (192), (196) and (197) of IC2201.
No signal output from pins (95), (96) and (97) of IC2201.
Check IC2201 and peripheral circuits.
Is each pin normal at IC4701?
Faulty: Check IC4701 and peripheral circuits.
Is each pin normal at IC4901?
Faulty: Check IC4901 and peripheral circuits.
Is each pin normal at IC4551?
Faulty: Check IC4551 and peripheral circuits.
Check SC4501, -4502, -4503 and -4504 and their cables.
Check outputs of main unit and headphone.
Is signal waveform normal at Q2105 and Q2106?
Faulty: Check Q2105 and Q2106 and peripheral circuits.
Is signal waveform normal at IC3802 and IC3804?
Faulty: Check IC3802 and IC3804 and peripheral circuits.
Is signal waveform normal at IC3805, IC3806 and IC3807?
Faulty: Check IC3805, IC3806 and IC3807 and peripheral circuits.
Check IC3809 and peripheral circuits.
1
No Picture
2
No Sound
61
LC-30HV4E
TROUBLE SHOOTING TABLE
(Continued)
(Display)
No 800-MHz signal input at pins (186), (187), (191), (192), (196) and (197) of IC2201.
No signal output from pins (95), (96) and (97) of IC2201.
Check IC2201 and peripheral circuits.
Is each pin normal at IC4701?
Faulty: Check IC4701 and peripheral circuits.
Is each pin normal at IC4901?
Faulty: Check IC4901 and peripheral circuits.
Is each pin normal at IC4551?
Faulty: Check IC4551 and peripheral circuits.
Check SC4501, -4502, -4503 and -4504 and their cables.
Check outputs of main unit and headphone.
Is signal waveform normal at Q2105 and Q2106?
Faulty: Check Q2105 and Q2106 and peripheral circuits.
Is signal waveform normal at IC3802 and IC3804?
Faulty: Check IC3802 and IC3804 and peripheral circuits.
Is signal waveform normal at IC3805, IC3806 and IC3807?
Faulty: Check IC3805, IC3806 and IC3807 and peripheral circuits.
Check IC3809 and peripheral circuits.
1
No Picture
2
No Sound
