LL-T2010W (serv.man15). Troubleshooting - Sharp Monitor Service Manual (repair manual)

ll-t2010w (serv.man15) service manual
Model
LL-T2010W (serv.man15)
Pages
6
Size
47.05 KB
Type
PDF
Document
Service Manual
Brand
Device
Monitor / Troubleshooting
File
ll-t2010w-sm15.pdf
Date

Read Sharp LL-T2010W (serv.man15) Service Manual online

LL-T2010W
TROUBLE SHOOTING
4 – 1
CHAPTER 4. TROUBLE SHOOTING
Check whether the following cables are connected correctly.
In addition, check whether the PCs video mode is properly set to the signal timing witch meets this machine.
*
Attached cables
•  Dedicated AC adapter
•  Dedicated signal cable (RGB cable, DVI cable)
(No)
(Yes)
1
When the power button is pressed, does 
LED light up?
Execute
(No)
(Yes)
1
1
When the RGB cable is disconnected, 
does LED change from Green to Orange?
Execute
(No)
(Yes)
2
When the RGB cable is connected, does 
LED keep Green? (No change from 
Green to Orange)
Execute
(No)
(Yes)
3
Does B/L light up?
Execute
(No)
(Yes)
4
Does the display work normally in each 
video mode?
No abnormality
Execute
(No)
(Yes)
2
Is 5V (main PWB D22 cathode) supplied? 
Execute
(No)
(Yes)
2
Does Q9 (1PIN)-R185 output? (3V)
Execute
(No)
(Yes)
Does FB7-CN5 (2PIN) output? (1.9V)
Check connection of the SW cable and 
the SW PWB. 
Check 09 and its peripheral circuits. 
2
(No)
(Yes)
Is the input signal port connected with the 
analog signal cable?
Press INPUT key to switch to the 
proper input signal port. 
Check the DC+5V power line and the 
IC19 peripheral circuits. 
Check the DC+12V power line, F1, F2, 
D1, D2 of the DC jack PWB, and their 
peripheral circuits. 
Check the exclusive-use AC adapter. 
(No)
(Yes)
Is DC+12V supplied from the exclusive-
use AC adapter?
(No)
Is CN8-3PIN at DC+12V?
(Yes)
(No)
Is D21 cathode at DC+5V?
The display does not work. (Analog RGB)
LL-T2010W
TROUBLE SHOOTING
4 – 2
(No)
(Yes)
Is D23 cathode at DC+3.3V?
Check the DC+3.3V power line and the 
IC21 peripheral circuits. 
Check the DC+2.5V power line and the 
IC22 peripheral circuits. 
Check the POWER_CTL signal and 
IC18 peripheral circuits. 
Check the RESET circuit in the 
peripheral of IC16. 
Check the peripheral circuits of IC24 
X1.
Check the clock circuit in the peripheral 
of IC6 X2. 
Check the analog signal cable and CN1 
(CN2).
Check the peripheral circuits of IC3 and 
IC4.
Execute      . Microcomputer circuit 
check/GM5060
Check the peripheral circuits of IC2. 
Check the peripheral circuits of Q7.
Check the MAINPW signal and wiring 
between CN5 the main SW on the SW 
PWB.
(No)
(Yes)
Is D25 cathode at DC+2.5V?
(No)
(Yes)
Is the voltage across the fuse F4 
DC+12.0V?
(No)
(Yes)
Is the positive side (no connection of part) 
of C145 at H level (DC+5V)?
(No)
(Yes)
Is the FB15 level changed by turning 
on/off the POWER SW?
(No)
(Yes)
Is the output level of Q7 (connected with 
R35) at L level (DC+0V)?
(No)
(Yes)
Is IC15-21PIN oscillating?
(No)
(Yes)
Is X3's PIN on C111 side oscillating?
(No)
(Yes)
Are the signal waveforms of R35 and R37 
(R25, R28) normal?
(No)
(Yes)
Is the signal waveform of R45 (R34) 
normal?
(No)
(Yes)
Are the signal waveforms of R74 and R76 
normal?
When R94 and R95 are disconnected, 
are the waveforms on IC8 side normal?
Check the DCLK  DEN line. 
(No)
Replace IC8. 
(No)
Are the signal waveforms of R94 and R95 
normal?
(Connect the cable of CN10 and CN11.)
(No)
(Yes)
(Yes)
(Yes)
Are the signal waveforms of test pins 
TP22 and TP23 normal? (The cable of 
CN10 and CN11 at the back can be 
disconnected.)
Continued from
2
5
LL-T2010W
TROUBLE SHOOTING
4 – 3
(No)
(Yes)
Are the waveforms of RN31~RN35
normal?
Is the positive side (no connection of 
part) of C163 at DC+3.3V?
Is R213 at H level (DC+3.3V)?
When the LCD module is disconnected, 
are the waveforms of RN31~RN35 
normal?
Replace the LCD module. 
Check the DC+12V power line and fuse 
F2. 
Check the main PWB in the peripheral 
of Q11, Q12, D20, and CN7, and check 
the DC jack PWB. 
Replace the inverter PWB unit. 
Check the main PWB in the peripheral 
of IC14, and check the DC jack PWB.
Check the peripheral circuits of R203 
and IC21. 
Check the peripheral circuits of IC18. 
(No)
(Yes)
Is the positive side of C164 at DC+12V?
(No)
(Yes)
Is CN11-20PIN at DC+3.3V?
Replace the LCD module. 
(No)
(Yes)
Are 1PIN and 2PIN of CN3 on the DC jack 
PWB at DC+12V?
(No)
(Yes)
Is Cn7-5PIN at DC+5V?
(No)
(Yes)
Are test pins LD3 and LD4 at DC+2.5V or 
less?
(No)
(Yes)
Is 1PIN of CN2~CN7 on the inverter PWB 
about 750Vrms? (Be careful of electric 
shock. For voltage measurement, use a 
high-voltage probe of 100:1 or more.)
Check the lamp in the LCD module. 
(Yes)
(Yes)
(No)
(No)
(No)
Check the peripheral circuits of FB16 
and IC21. 
Check Q10 and POWER_LINE signal. 
Check the peripheral circuits of IC17. 
(Yes)
(Yes)
(Yes)
Continued from
2
3
Check the DC+5V power line and the 
IC19 peripheral circuits. 
Check the DC+3.3V power line and the 
IC21 peripheral circuits.
(No)
(Yes)
Is D21 cathode at DC+5V?
(No)
Is D23 cathode at DC+3.3V?
4
LL-T2010W
TROUBLE SHOOTING
4 – 4
(No)
Is D25 cathode at DC+2.5V?
Check the DC+2.5V power line and the 
IC22 peripheral circuits. 
(Yes)
(Yes)
Does the whole display remain black?
Is the voltage across the fuse F3 
DC+12.0V?
(No)
Check the POWER_CTRL2 signal and 
the Q4 peripheral circuits. 
(No)
(Yes)
(Yes)
Is the display size abnormal?
Is the setup item of MODE SELECT in 
the adjustment properly set?
Check X1, X3, IC15, the peripheral 
circuits, and the software. 
(No)
Adjust properly according to the display 
adjustment procedure. 
(No)
(Yes)
When the whole black display is shown 
from the signal source, is there any flicker 
of colors?
Check IC10, IC11, IC12, and the 
peripheral circuits. 
(No)
(Yes)
(Yes)
Is there any deflection or flicker on the 
LCD display?
Is the setup item of MODE SELECT in 
the adjustment properly set?
Check IC2, IC3, IC4, and the peripheral 
circuits.
(No)
Adjust properly according to the display 
adjustment procedure.
(No)
(Yes)
(Yes)
(Yes)
Is there any abnormality in colors of the 
LCD display?
Are the setup items of GAIN CONTROL 
and WHITE BALANCE properly set?
(No)
Adjust properly according to the display 
adjustment procedure.
(No)
(Yes)
Is the analog color signal output 
normal? (Pins on C7, C11, C15, C18 
side)
(No)
Check the IC1 peripheral circuits. 
(Yes)
When BRIGHT   CONTRAST of a 
gradation pattern, is the abnormal area 
shifted?
Check the IC10, IC11, and IC12 
peripheral circuits. 
(Yes)
Display the RGB color gradation of the 
output data lines of RN1~Rn12 and 
check the line corresponding to the 
abnormal color.
(No)
Is the positive side of C28 at DC+5V?
(No)
Check the L10 peripheral circuits. 
(Yes)
Are the oscillation circuits of X1 and X3 
normal? (24MHz)
(No)
Check X1, X2, and the IC15 peripheral 
oscillating circuit. 
(Yes)
Are the clock (R94) and the signal 
output of DE (R95) normal?
Check the IC17 peripheral circuits, 
CN10, CN11, and the LCD module. 
(No)
Execute
(Yes)
Continued from
4
2
Page of 6
Display

Download Sharp LL-T2010W (serv.man15) Service Manual (Repair Manual)

Here you can read online and download Sharp LL-T2010W (serv.man15) Service Manual in PDF. LL-T2010W (serv.man15) service manual will guide through the process and help you recover, restore, fix, disassemble and repair Sharp LL-T2010W (serv.man15) Monitor. Information contained in service manuals typically includes schematics / circuit diagrams, wiring diagrams, block diagrams, printed wiring boards, exploded views, parts list, disassembly / assembly, pcb.