Read Sharp LL-T17A4 (serv.man8) Service Manual online
LL-T17A4-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
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