Troubleshooting Chart - Sharp QA-1650 Service Manual

TROUBLESHOOTING CHART
START
Handle TFT-LCD panel with care,
because it is very expensive parts.
POWER ON ie LED lighting? >S2
YE
Is power supply
oltage OK described below:
Go to Power Source
Circuit Check.
Input digital video
signal.
(CGA,14.318MHz)
Press the RESET
SW on the panel.
ls normal display made
by phase adjustment?
Input analog video
signal.
(VGA,25.175MHz) input digital video
signal.
(CGA,14.318MHz)
Is display normal?
YES|
Press tha RESET
SW on the panel.
Is normal display made
by phase adjustment?
Press the RESET
SW on the panel.
ls normal display made
by phase adjustment?
Does screen condition
changes when threshold
value is changed?
Go to Analog Video Signal Go to LCD Display
Display Failure Check. © Failure Check@
Go to Analog Video Signal
Display Failure Check. ©
Input composite sync.signal.
(MAC 1 ,31.24MHz)
is display normal?
YES) Press the RESET
SW on the panel.
TP206 (VCPU) 5.1V
TP207 (VLCD) 5V
TP20g(VCC) 5V
TP205 -10V
CN201-@ 12V
TP(A-VCC) 5V
TP210(A-VCC) 5V
\s normal display made
by phase adjustment?
Go to Cimposite Sync.
(8) Signal Display Failure Chéck.@
4