Sharp LC-17SH1E (serv.man2) Service Manual ▷ View online
TROUBLESHOOTING GUIDE
E-1
(LCD SECTION)
POWER DOES NOT TURN ON
YES
NO
CHECK IC101.
NO
YES
CHANGE LCD PCB.
IS THERE VOLTAGE AT
PIN 1~6 OF CD3804 ?
PIN 1~6 OF CD3804 ?
CHECK Q3804, IC3804, IC3805,
IC3806 AND IC3809.
IC3806 AND IC3809.
NO
IS F3801 BROKEN ?
YES
CHANGE F3801.
NO
YES
CHECK IC3803, AND AT 5V
LINE.
LINE.
IS THERE VOLTAGE
OF 1 PIN OF IC3803
AT9.5V AND 3 PIN
AT5V ?
OF 1 PIN OF IC3803
AT9.5V AND 3 PIN
AT5V ?
AT STATE OF POWER
KEY PUSHING, IS THERE
HI AT PIN 6 OF IC101 ?
KEY PUSHING, IS THERE
HI AT PIN 6 OF IC101 ?
TROUBLESHOOTING GUIDE
E-2
THE PICTURE APPEARS, BUT
THE AUDIO DOES NOT
APPEAR. (AT RF MODE)
THE AUDIO DOES NOT
APPEAR. (AT RF MODE)
YES
NO
NO
YES
CHECK IC6601 AND
PERIPHERAL CIRCUIT.
PERIPHERAL CIRCUIT.
CONNECT SP301.
NO
CHECK IC301, IC302 AND
PERIPHERAL CIRCUIT.
PERIPHERAL CIRCUIT.
YES
NO
CHANGE TU4401.
IS SP301 CONNECTED ?
IS THERE SIGNAL ON
PIN 11 OF IC301 AND
IC302 ?
PIN 11 OF IC301 AND
IC302 ?
YES
NO
IS THERE SIGNAL ON
PIN 16 OF TU4401 ?
PIN 16 OF TU4401 ?
IS THERE SIGNAL ON
PINS 1 AND 4 OF
CP301 ?
PINS 1 AND 4 OF
CP301 ?
CHAGE SP301.
YES
CHECK IC6601 AND
PERIPHERAL CIRCUIT.
PERIPHERAL CIRCUIT.
IS THERE SIGNAL ON
PIN 67 OF IC6601 ?
PIN 67 OF IC6601 ?
TROUBLESHOOTING GUIDE
E-3
THE PICTURE DOES NOT
APPEAR (1).
APPEAR (1).
NO
YES
CHECK THE CONNECTED
OF CP3803 AND THE
VOLTAGE OF PINS 6, 7 AND
8.
OF CP3803 AND THE
VOLTAGE OF PINS 6, 7 AND
8.
CONNECT CD7201.
NO
YES
IS CD7201 CONNECTED ?
DOSE BACK LIGHT SHINE ?
YES
NO
CHANGE V2301.
IS THERE SIGNAL
AT IC7201 ?
AT IC7201 ?
CHANGE IC7201.
IS THERE SIGNAL AT
PINS 5, 6, 8, 9, 11, 12, 14,
15, 17 AND 18 OF
CD7201 ?
PINS 5, 6, 8, 9, 11, 12, 14,
15, 17 AND 18 OF
CD7201 ?
YES
NO
CHECK IC801.
TROUBLESHOOTING GUIDE
E-4
THE PICTURE DOES NOT
APPEAR (2).
APPEAR (2).
YES
NO
YES
CHANGE IC5001.
CONNECT CP5003.
NO
NO
YES
CHANGE IC801 AND
PERIPHERAL CIRCUIT.
PERIPHERAL CIRCUIT.
CHECK C832, C859 AND
C883 AND PERIPHERAL
CIRCUIT.
C883 AND PERIPHERAL
CIRCUIT.
IS CP5003 CONNECTED
AND IS THERE SIGNAL AT
PIN 1, 3 AND 5 ?
AND IS THERE SIGNAL AT
PIN 1, 3 AND 5 ?
IS THERE SIGNAL
AT C832, C859
AND C883 ?
AT C832, C859
AND C883 ?
IS THERE SIGNAL AT
PIN 31, 33 AND 35 OF
IC5001 ?
PIN 31, 33 AND 35 OF
IC5001 ?
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