Sharp LL-T1510A Service Manual ▷ View online
(2) <An error occurs when using Power Save mode>
Is the signal input of the 42nd pin of
the U10 at low level (0 V)?
the U10 at low level (0 V)?
No
Check the microprocessor control circuit
for the U10.
for the U10.
Check the operation PWB and related
parts (LED and cables).
parts (LED and cables).
(3) <Backlight goes out improperly>
Is the 5th pin of the JP2 at DC+12V?
Check the CD+12V power line (12 V) and
the power supply circuit for the JP2.
the power supply circuit for the JP2.
Is the signal input of the 26th pin of
the U10 at low level (0 V)?
the U10 at low level (0 V)?
Check the microprocessor control circuit
for the U10.
for the U10.
Is the 1st pin of the JP2 at DC+5V?
Check the DC+5V power line (5 Va) and the
power supply circuit for the U17.
power supply circuit for the U17.
Yes
Yes
No
No
Yes
Yes
No
Check the inverter PWB unit.
Check the lamp inside the LCD module.
(5) <USB error>
Is DC+12 V outputted from the
power supply unit?
power supply unit?
Check the power supply unit and
fuses (power supply unit).
fuses (power supply unit).
Replace the USB unit with a new one.
Yes
Yes
No
No
Yes
Are the 1st pins of the inverter PWB
units CN2 and 3 at about 1500 Vrms?
(Use due caution not to get an electric
shock accident. For measuring the
voltage, use a high-voltage probe of
more than 100:1. )
units CN2 and 3 at about 1500 Vrms?
(Use due caution not to get an electric
shock accident. For measuring the
voltage, use a high-voltage probe of
more than 100:1. )
Is the 26th pin of the U17 at 0 V when
the backlight luminance is at the
maximum (OSD BRIGHT31)?
the backlight luminance is at the
maximum (OSD BRIGHT31)?
Check the operation PWB (operation PWB
and cables) and the microprocessor control
circuit for the U10 and U17.
and cables) and the microprocessor control
circuit for the U10 and U17.
No
No
Yes
Is the 3rd pin of the JP2 at 0 V when the
backlight luminance is at the maximum
(OSD BRIGHT31)?
backlight luminance is at the maximum
(OSD BRIGHT31)?
Check the backlight control circuit for the JP2.
(4) <Screen error>
Is the signal output of the 25th pin of
the U10 at low level (0 V)?
the U10 at low level (0 V)?
No
Check the microprocessor control circuit for
the U10.
the U10.
Yes
It the 8th pin of the U18 at DC+5V?
Check the DC+5 V power supply line (% Vb)
and power supply circuit for the U18.
and power supply circuit for the U18.
Is the signal output of the 1st pin of
the U12 at high level (Cd+5 V)?
the U12 at high level (Cd+5 V)?
Check the power supply control circuit for
the U12.
the U12.
Is the 2nd pin of the U14 at CD+3.3 V?
Check the DC+3.3 V power supply line (3.3 Vb)
and the power supply circuit for the U14.
and the power supply circuit for the U14.
Does the entire screen of the LCD
remain white?
remain white?
Check the LCD connector and LCD module.
Check the LCD control signal
circuit for the U1 and U3.
circuit for the U1 and U3.
Does the entire screen of the LCD
remain black?
remain black?
Check the LCD control signal circuit for
the U1 and U3.
the U1 and U3.
Is the size of the LCD screen abnormal?
Are the adjustment items, ADJUSTMENT,
MODE, and SELECT, properly set?
MODE, and SELECT, properly set?
Check the LCD control signal circuit for
the U1 and U3.
the U1 and U3.
Adjust and set the adjustment
items properly, following the
screen adjustment procedure.
items properly, following the
screen adjustment procedure.
Check the PLL circuits for the
U2, U4, U5, U6, U10, and U11.
U2, U4, U5, U6, U10, and U11.
Does the LCD screen jolt or flicker?
Are the adjustment items ADJUSTMENT,
MODE, and SELECT set properly?
MODE, and SELECT set properly?
Check the PLL circuits for the U2,
U4, U5, U6, U10, and U11.
U4, U5, U6, U10, and U11.
Adjust and set the adjustment
items properly, following the
screen adjustment procedure.
items properly, following the
screen adjustment procedure.
Do the colors of the LCD screen
abnormal?
abnormal?
Are the adjustment items GAIN, CONTROL,
and WHITE BALANCE properly set?
and WHITE BALANCE properly set?
Is the digital color signal output of the U2
normal? (See Waveform diagram 9.)
normal? (See Waveform diagram 9.)
Is the digital color signal input and output of
the U1 normal? (See Waveform 10.)
the U1 normal? (See Waveform 10.)
Check the LCD connector and LCD module.
Adjust or set the adjustment
items, following the screen
adjustment procedure.
items, following the screen
adjustment procedure.
Check the video amplifier
circuit for the U7.
circuit for the U7.
Check the AD conversion
circuit for the U2.
circuit for the U2.
Check the color signal
processing circuit for the U1
and U3.
processing circuit for the U1
and U3.
Is the OSD display of the LCD screen
abnormal?
abnormal?
Check the color signal processing circuit for
the U1 and U3.
the U1 and U3.
Check the OSD display circuit
for the U8, U10, and U11.
for the U8, U10, and U11.
Is the LCD screen normal at the time of
composite sync or sync-on green?
composite sync or sync-on green?
Check the synchronizing signal processing
circuit for the U7, U19, U21, U22 and U23.
circuit for the U7, U19, U21, U22 and U23.
Are the settings of the display screen
adjustments properly stored in memory?
adjustments properly stored in memory?
Check the memory circuit for the U10 and u11.
The LCD unit is normal.
No
No
No
No
No
No
No
No
Yes
Yes
Yes
Yes
No
No
No
Yes
Yes
Yes
No
No
No
No
No
Yes
Yes
No
No
No
Yes
Yes
No
Are the signal outputs of the 9th and 14th pins
of the JP4(See Waveform diagrams 4 and 5.)
of the JP4(See Waveform diagrams 4 and 5.)
Are the output signals of the 15th pin of the U5
and the 8th pin of the U2 normal?
(See Waveform diagrams 6 and 7.)
and the 8th pin of the U2 normal?
(See Waveform diagrams 6 and 7.)
Are the analog color signal outputs of the 29th
pin, 32nd pin, and 35th pin of the U properly
set? (See Waveform diagram 8.)
pin, 32nd pin, and 35th pin of the U properly
set? (See Waveform diagram 8.)
Are the signal outputs of the 13th pin, 14th pin
and 15th pin of the U8 normal?
(See Waveform diagram 11.)
and 15th pin of the U8 normal?
(See Waveform diagram 11.)
CHAPTER 5. TRIMMING AND PROCESSING LEAD WIRES
Step 1
Put the CCFT cable and LCD cable into shield plate bushings to
prevent them from getting caught when installing the shield plate.
(Figs. 1 and 2)
prevent them from getting caught when installing the shield plate.
(Figs. 1 and 2)
Put the CCFT cable at the back of the LCD module to prevent it
from getting caught when installing the LCD module.
from getting caught when installing the LCD module.
Fig. 1
Fig. 2
Step 2
When installing the hinge cover, use caution not to get the power
cable and the LCD cable caught in the cover. (Fig. 3)
cable and the LCD cable caught in the cover. (Fig. 3)
Fig. 3
CCFT cable
Power supply
cable
cable
Switch cable
LCD cable
LCD cable
Power supply
cable
cable
CHAPTER 6. WAVE FORM
Waveform measurement condition: Input each of the display patterns
and measure the waveform (timing chart).
and measure the waveform (timing chart).
Wave-form
No.
Measurement point
Name of waveform
Display pattern
1
22nd pin of the U10
X1
Arbitrary
2
17th pin of the U10
TO_MCU_V
Arbitrary
3
15th pin of the U10
TO_MCU_H
Arbitrary
4
8th pin of the JP4
CLK
Arbitrary
5
14th pin of the JP4
BDE_OUT
Arbitrary
6
15 pin of the U5
DS
Arbitrary
7
8th pin of the U2
CLKOUT
Arbitrary
8
29th pin, 32nd pin, and 35th pin of the U7
PRE-Amp RGB OUT
16 monochromatic gradation patterns
9
52nd ~ 59th pins and 62nd ~ 89th pins of (R) of the U2
32nd ~ 39th pins and 42nd ~ 49th pins of the (G) of the U2
12th ~ 19th pins and 22nd ~ 29th pins of (B) of the U2
32nd ~ 39th pins and 42nd ~ 49th pins of the (G) of the U2
12th ~ 19th pins and 22nd ~ 29th pins of (B) of the U2
A/D OUT DATA
Monochrome pattern at every 2 lines
10
53rd ~ 59th pins, 63rd ~ 69th pins, and 73rd ~ 79th pins, 83rd ~
89th pins, 93rd ~ 99th pins, and 103rd and 109th pins of the U1
89th pins, 93rd ~ 99th pins, and 103rd and 109th pins of the U1
ASIC OUT DATA
Monochrome pattern at every 2 lines
11
13th, 14th, and 15th pins of the U8
OSD COLOR DATA
Black pattern on entire screen OSD menu
display
display
CAUTION
(1) Use the probe TektronixP6139A.
(2) Reception mode: VESA 1024 x 768 H:60.024 Khz
V:75.075 Hz DOTCLK: 78.750MHz
Oscilloscope
:
Tektronix TDS744A
Input signal
:
VESA1024 x 768
H: 60.02 kHz V: 75.075 Hz
DOTCLK: 78.750 MHz
H: 60.02 kHz V: 75.075 Hz
DOTCLK: 78.750 MHz
WAVE FORM 1 : X1(22th pin of the U10.)
Frequency :
8.000MHz
Display screen : arbitrary
WAVE FORM 2 : TO_MCU_V(17th pin of the U10.)
Frequency :
75MHz
Display screen : arbitrary
Click on the first or last page to see other LL-T1510A service manuals if exist.