DOWNLOAD Sharp LL-T1820 (serv.man9) Service Manual ↓ Size: 3.08 MB | Pages: 36 in PDF or view online for FREE

Model
LL-T1820 (serv.man9)
Pages
36
Size
3.08 MB
Type
PDF
Document
Service Manual
Brand
Device
Monitor / Complete
File
ll-t1820-sm9.pdf
Date
PREV: Sharp LL-T1820 (serv.man8) Service Manual

Sharp LL-T1820 (serv.man9) Service Manual ▷ View online

PC-UM10M
LL-T1820-H/B   TROUBLE SHOOTING
4 – 3
(No)
(No)
(No)
(Yes)
(Yes)
(No)
(No)
(Yes)
(No)
(Yes)
(Yes)
(No)
(Yes)
(No)
(Yes)
(No)
(Yes)
(Yes)
(Yes)
(No)
(No)
(No)
(Yes)
(Yes)
(Yes)
(Yes)
(No)
(Yes)
(No)
(No)
(No)
(Yes)
(No)
(No)
(Yes)
(No)
(Yes)
(Yes)
Check DC+5V power supply line (AV5) , 
POWER_CTL1 signal, and circuits around 
Q808.
Check DC+5V power supply line (PV5) , 
POWER_CTL3 signal, and circuits around 
Q800.
Check the power supply unit and cable and 
their connections, and POWER_CTL1 
Check DC+2.5V power supply line (DV25), 
POWER_CTL1 signal, and circuits around 
IC800.
Check DC+12V power supply line (LCDV), 
POWER_CTL2 signal, and circuits around 
Q800.
Check OSC500 and clock circuit around 
IC502.
Clock (R517) and DE (R515) signal outputs 
are normal?
ADJUSTMENT and MODE SELECT are set 
properly?
Signal waveform of test terminal LD510 is 
normal?
ADJUSTMENT and MODE SELECT are set 
properly?
Adjust according to "screen adjustment 
procedure".
Adjust according to "screen adjustment 
procedure".
Check circuits around IC300, IC301, and 
IC401.
Check circuits around IC701, and CN700 
and LCD module.
Check DC+5V power supply line (DV5A), 
POWER_CTL1 signal, and circuits around 
Q808.
Test terminals LD419, LD515, and LD700 are 
DC+3.3V?
Signal waveform of test terminal LD500 is 
normal?
Test terminals LD416, LD417, and LD418 are 
DC+3.3V?
8th pin of Q808 is DC+5V?
Test terminal LD809 is DC+5V?
Test terminal LD810 is DC+5V?
Test terminal LD807 is DC+12V?
Test terminal LD509 is DC+2.5V?
TP801 is DC+12.0V?
36th pin of LC601 is in H level (DC+5V)?
The entire LCD screen is white?
The entire LCD is black?
The size of LCD screen is abnormal?
 LCD screen jitters or flickers?
Check circuits around IC400.
Check circuits around IC402.
Check circuits around IC601.
Test terminal of LD701 is DC+12V?
Check circuits around X600 and IC601.
Check circuits around IC501.
Check circuits around CN700.
Check circuits around IC401.
Check circuits around IC501.
4
PC-UM10M
LL-T1820-H/B   TROUBLE SHOOTING
4 – 4
(No)
(No)
(No)
(Yes)
(Yes)
(Yes)
(Yes)
(No)
(No)
(Yes)
(No)
(No)
(Yes)
(Yes)
(Yes)
(No)
(Yes)
(No)
(No)
(Yes)
(No)
(Yes)
(No)
(Yes)
(No)
(Yes)
(Yes)
(No)
(Yes)
(Yes)
(No)
(No)
(Yes)
(Yes)
GAIN CONTROL and WHITE BALANCE 
are set properly?
Analog color signal output (C302, C304, 
C306, C317, C320, and C322) is normal?
Digital color signal output of IC401(ID0    
ID47) is normal?
Digital color signal output of IC501 (OD0    
OD47) is normal?
Check circuits around IC701, and CN700 
and LCD module.
Check circuits around IC401, IC403, and 
IC601.
Digital color signal output of IC401 (ID0    
ID47) is normal?
Press INPUT key to switch over to the 
correct input signal port.
Check CN100 and 200, and signal source 
and digital signal cable.
Check circuits around IC100, IC102, IC103, 
IC200, and IC201.
Check CN100 and 200, and signal source 
and digital signal cable.
Display is normal in composite sync and sync-
on-green signal input.
Adjustment settings are stored after display 
screen is adjusted?
AUTO function of GAIN CONTROL operates 
properly?
Input signal port is the one to which digital 
signal cable is connected?
Waveforms of IC103s and 201s 5th and 6th 
pins change normally when resolution is 
changed?
Test terminals LD100, LD101, LD200, LD201, 
LD202, LD203, LD204, LD205 are DC+3.3V?
CN100 and 200 signals (at 1st, 2nd, 9th, 10th, 
17th, 18th, 23rd, and 24th pins) are normal?
IC101 and IC203 signal output (ID0    ID47, 
HIS, IVS,ICK, IACT) are normal?
LCD screen color is abnormal?
Input is changed over properly?
No error.
Display is normal in analog input?
TP100 and 200 are in H level (DV+5V)?
Check circuits around IC501.
Adjust according to "screen adjustment 
procedure".
Check circuits around IC401.
Check circuits around IC401 and IC501.
Check circuits around IC501 and IC701.
Check circuits around IC401 and IC403.
Check circuits around IC601.
check circuits around IC601 and IC604.
Check circuits around IC401.
First, check with analog signal input.
Check circuits around IC400.
Check circuits around IC101 and IC203.
continued from  4
5
PC-UM10M
LL-T1820-H/B   WAVE FORM
5 – 1
CHAPTER 5. WAVE FORM
Waveform measurement condition: Input each of the display patterns and measure the waveform (timing chart).
CAUTION
Reception mode: VESA 1280 X 1024
H: 80kHz V: 75Hz DOTCLK: 135MHz
WAVE FORM1 : REFCK (LD500)
Frequency:
60MHz
Display screen: Arbitrary
PV/DIV, 10ns/DIV
WAVE FORM2 : XTAL (2pin of the IC601)
Frequency:
14.318MHz
Display screen: Arbitrary
1V/DIV, 50ns/DIV
WAVE FORM3 : VSYNC (LD304)
Frequency:
75Hz
Display screen: Arbitrary
1V/DIV, 5s/DIV
Wave-form No.
Measurement point
Name of waveform
Display pattern
1
LD500
REFCK
Arbitrary
2
IC601 of 2PIN
XTAL
Arbitrary
3
LD304
VSYNC
Arbitrary
4
LD303
HSYNC
Arbitrary
5
LD510
ICK
Arbitrary
6
LD512
VS
Arbitrary
7
LD513
IHS
Arbitrary
8
IC701 of 10PIN
DCLK
Arbitrary
9
IC701 of 9PIN
DEN
Arbitrary
10
LD300, LD301, LD302
RGB OUT
16 monochromatic gradation patterns
Oscilloscope: LeCroy9362
Input signal:
VESA1280 X 1024
H: 80kHz  V: 75Hz
DOTCLK: 135MHz
GND
GND
GND
PC-UM10M
LL-T1820-H/B   WAVE FORM
5 – 2
WAVE FORM4 : HSYNC (LD303)
Frequency:
80kHz
Display screen: Arbitrary
1V/DIV, 5
µ
s/DIV
WAVE FORM5 : ICK (LD510)
Frequency:
67.5MHz
Display screen: Arbitrary
1V/DIV, 5s/DIV
WAVE FORM6 : VS (LD512)
Frequency:
75Hz
Display screen: Arbitrary
1V/DIV, 5s/DIV
WAVE FORM7 : IHS (LD513)
Frequency:
80kHz
Display screen: Arbitrary
1V/DIV, 5
µ
s/DIV
GND
GND
GND
GND
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