Read Sharp LL-T155A (serv.man2) Service Manual online
CHAPTER4. TROUBLESHOOTING
1
No power supply
LED comes on in green when
power switch is turned on?
power switch is turned on?
No
Yes
LED comes on in red.
LED comes on in orange.
Is the unit in power save mode (No synchronizing
signal input)
signal input)
Check if personal computer is turned on?
Check if RGB cable is connected.
Check if synchronizing signal is applied.
Check if RGB cable is connected.
Check if synchronizing signal is applied.
Is voltage output to key
switch unit connector
terminal (J4)?
switch unit connector
terminal (J4)?
Key switch unit
defective
defective
+12 V/+5 V output at power
unit connector terminal
CN-JP5) ?
unit connector terminal
CN-JP5) ?
Defective
interface unit
interface unit
100 V AC input to power unit
input connector?
input connector?
Defective
power unit
power unit
Backlight comes on?
+12 V and On signal "H" at
inverter terminal (JP5)?
inverter terminal (JP5)?
Check AC
switch and cord.
switch and cord.
High voltage
*1 output to inverter PWB output
terminal?
*1 output to inverter PWB output
terminal?
Defective inverter unit
Check LCD module lamp.
Note 1: Note that up to about 1.4 kVrms is applied when the inverter is started or in normal operation.
Is LED in key switch unit normal?
(Check for disconnected cable.)
(Check for disconnected cable.)
No
Yes
Yes
No
Yes
No
No
No
Yes
Yes
No
Yes
No
Yes
No
Yes
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