DAYTEK LC1521NT Посібник з експлуатації - Сторінка 8

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Trouble Shooting
Key IC list
Item
1
TDA15001H1
2
3
4
5
MP1410ES-SOIC-8
6
8
9
(only for
KLC-1521US)
11
12
14
Tuner AFT1/L301
Start order：
Turn on the
N401 RESET and
power
IO port initialize
1)Verify the state of TV set.Please switch the TV on ,then verify the LED color. Red is
standby state and green is working state.
2)Checking Supply Power.If the color of LED is yellow,the power supply for signal board 。
N801 supply 5V and N802 supply 3.3V(KLC-1508US,KLC-1521US),N804 、 N806 supply 3.3V
power(Test the PIN 2).N805 supply 2.5V(Test the PIN 2),D803 supply 8.3V,V401 and V402
supply 1.8V. All these are for main IC N401,N501.
3)After turning on the power, if blank screen appears (no back light lamp), just
press POWER button several times, if blank screen still there.Check if the voltage of
every power supply is normal.
4)Check if the crystal oscillator X501(14.318180MHz) X401(24.576MHz) oscillate or not,
and oscillate frequency is right or not.
5)Back light control signal (BKLON) of XS801 has high level (about 2.5V)
or not, if not, check whether fault soldered or short circuit happened。
6) If back light lamp is on while there is no display,check N407 and N501's reset circuit
and the output of the oscillator to confirm the CPU and SCALER are working or not.If RGB
is abnormal,check N501;If RGB is working correctly and the other channel is
abnormal ,please check N501.
Type
Maker
Philips
MST518
MSTAR
24LC32A
MICROCHIP
24LC21A
MICROCHIP
FDS9435A
FAIRCHILD
TDA1517
PHILIPS
FSAV330
FAIRCHILD
TS5V330
1117-3.3V
1117 serial
1117-2.5V
1117 serial
Qingjia
electrify,
N501
reset, initialize
Package
QFP128
PQFP160
SOIC-8
SOIC-8
MPS
SOIC-8
SOIC-8
SIL9MPF
TSSOP-16 N301,N303
TI
SOT223
SOT223
Turn on back
light lamp
Circuit No.
Qty.
N401
1
N501
1
N402
1
N302
1
N801,N802
2
N803
1
1
N200
2
N804,N806
2
N805
1
N100
1
Successful start
and LCD display