Sharp LL-T17D4H (serv.man10) Service Manual ▷ View online
LL-T17D4-H/B
TROUBLE SHOOTING
5 – 1
CHAPTER 5. TROUBLE SHOOTING
1. No Power
YES
NO
NO
YES
YES
NO
NO
YES
NO
YES
Power board
failure.
failure.
F201, FB205
failure.
failure.
Is there 13V on CN201
connection ?
connection ?
Is there 13V on C203
positive terminal ?
positive terminal ?
Is there 5V on C205
positive terminal ?
positive terminal ?
IC201 failure.
L201, D201 failure.
IC400, IC300 failure.
1. IC202, D205 failure.
2. IC203, D206 failure.
1. Is there 3.3V on C233 positeve
terminal ?
terminal ?
2. 2.5V on C213 positeve terminal ?
Is there any voltage
waveform on IC201
PIn2 ?
waveform on IC201
PIn2 ?
1. IC400
Pin126 ,127 H& V s ync
2. IC400 Pin122
The s ignal cable
is disconnected
is disconnected
YES
NO
NO
YES
YES
NO
400 failure
YES
NO
Q203 failure
YES
NO
YES NO
IC301, Q306 failure
NO
IC02, IC03, IC04, IC05
T01, T02 failure
T01, T02 failure
IC01 failure
Is the backlight lighted ?
Check signal cable is fully connected to CN400
Check wire harness is fully connected
between the Lamp and P
between the Lamp and P
-I
board
The cable is desconnected
Check that C205 positive is
5V, CN01 pin8 is 5V
5V, CN01 pin8 is 5V
Is there 5V on CN400
Pin 1~3
Pin 1~3
2. No Display on Screen (LED is green)
Check IC01 pin15
Panel cable, IC400
Panel failure
Panel failure
LL-T17D4-H/B
TROUBLE SHOOTING
5 – 2
3.
Show “No Signal ” on screen
NO
IC400 failure
YES
NO
YES
NO
Check CN602 Pin13, Pin14
Signal cable is not
fully connected
fully connected
Check IC400 Pin127 same as
V-sync of input
V-sync of input
Check IC400 Pin126 same as
H-sync of input
H-sync of input
D618 failure
D619 failure
(Test patern: 32 Gray 1280 x 1024@60Hz)
YES
NO
The Signal cable not fully
connected
IC400 failure
NO
Check signal cable fully connected between
signal source and Interface Board
signal source and Interface Board
Check CN602 Pin1, 2, 3
RIN, GIN, BIN
RIN, GIN, BIN
D614, D615, D616 failure
4. color interference
5. Show "No Signal" on screen
YES
NO
Check Signal cable fully
connected between signal
source and Interface Board
connected between signal
source and Interface Board
IC601, IC603, IC400 failure
The Signal cable not fully connected
LL-T17D4-H/B
TROUBLE SHOOTING
5 – 3
6. Function key can not work
YES
NO
IC301 failure
YES
NO
KeyBoard failure
Check wire harness
is connected form I/F
board to Key
is connected form I/F
board to Key
Check voltage of IC301
pin38, 39, 40, 41, 42, 43 while key is
pressing
INPUT
MENU
MODE/DOWN
LEFT
RIGHT
Power-ON/OFF
pin38, 39, 40, 41, 42, 43 while key is
pressing
INPUT
MENU
MODE/DOWN
LEFT
RIGHT
Power-ON/OFF
The key cable is disconnected
7. No Sound
Check IC801 Pin15, 16 is approximately 12V
Check IC801 Pin 12 is Low voltage
YES
YES
NO
NO
YES
NO
NO
YES
NO
Earphone output normal
The speakers are failure
CN805 is failure
The cable is deiconnected
Check wire harness is connected
from CN804, CN802 to earphone board
from CN804, CN802 to earphone board
IC801failure
D807 failure
IC301failure
(Test signal: Vrms sine waveform)
Adjust VOLUME to max and check
IC801 pin 14, 17
IC801 pin 14, 17
LL-T17D4-H/B
CIRCUIT DIAGRAM
6 – 1
A
B
C
D
876
5
4
3
21
1
2
3
4
5
6
7
8
D
C
B
A
A
B
C
D
876
5
4
3
21
1
2
3
4
5
6
7
8
D
C
B
A
1/7
C
HAPTER 6. CIRCUIT D
IAGRAM
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