LL-T1512W (serv.man5). Chapter 4 Troubleshooting - Sharp Monitor Service Manual (repair manual)

ll-t1512w (serv.man5) service manual
Model
LL-T1512W (serv.man5)
Pages
2 Few pages! See other manuals at the bottom of the first or last page.
Size
11.24 KB
Type
PDF
Document
Service Manual
Brand
Device
Monitor / Chapter 4 Troubleshooting
File
ll-t1512w-sm5.pdf
Date

Read Sharp LL-T1512W (serv.man5) Service Manual online

LL-T1512W
4 – 1
CHAPTER 4. TROUBLESHOOTING
No power supply
Does LED turns on in green 
when power switch is turned 
on?
No
No
No
No
No
No
LED turns on in red?
Yes
Yes
Yes
Yes
Yes
Yes
Yes
*  Check LED for breakage.
*  Check cable for disconnection.
Replace any unit (main PWB, SW PWB, cable) 
which shows any defect, with a new one.
1) PC is turned off?
2) RGB cable is disconnected?
3) Synchronizing signal is output from RGB 
cable?
Check whether the unit is in power save 
mode (synchronizing signal is not input.).
Synchronizing signal is input to main PWB?
Replace RGB cable 
with a new one.
LED turns on in orange?
Check power input system.
1) AC adapter
   *  Normal?
   *  Connected properly?
2) Blown out fuse (F1, F2) ?
3) Each signal of 5V, D3, 3V, PVDD, 
AVDD1.8V is output ?
4) LED
   *  Check LED for breakage.
   *  Check the path between CN10 and 
IC22.
   *  Check the cable for disconnection.
Replace any defective unit.
[ 1) Adapter, 2) A Main PWB, 3) Switch 
PWB, ] with a new one.
Backlight turns ON?
Check for RGB cable input 
signal.
Replace RGB cable.
Normal
Normal
Normal
Defective
Defective
*  Check inverter block of main PWB.
Note: Use caution when checking output 
side because it has a high voltage. 
Replace LCD module lamp with 
a new one.
Replace main PWB 
unit with a new one.
A
Check each signal of 
BL_ON,+12V,BRI(150Hz,
Duty 15~65%)
LL-T1512W
4 – 2
A
Screen does not operate normally.
Check RGB cable.
Check DVI cable.
Defective
Replace RGB cable or 
DVI cable with a new 
one.
Check screen condition by changing display modes.
Reset the all adjustment to check if screen condition changes.
(Press and hold MENU and SELECT buttons while turning on power switch.)
Screen stays in black.
Screen stays in white.
Screen jitters or on-screen 
characters flicker.
Abnormal color
Check the following signals
1) Check if module control signal (IC15) is output.
2) Check if gate voltage (5VLCD) is output 
normally.
3) Check if Source voltage (3.3VLCD) is output 
normally.
Yes
No
Yes
No
Yes
No
CLOCK and PHASE 
can be adjusted?
Does abnormal area move on 
screen when BLACK LEVEL or 
CONT is changed after H-POS 
or V-POS is set?
Switch PWB defective
Main PWB defective.
LCD panel defective.
Normal
3.3 V output is generated? 
(USB PWB IC1 3pin)
Check regulator 
(USB PWB IC1) 
and its peripheral circuits.
No
Yes
Clock is generated 
(4 MHz: USB PWB IC3, pin 25)
Check clock generator 
(USB PWB X1) 
and its peripheral circuits.
No
Yes
RESET 
(USB PWB IC3, pin 6) is High?
Check USB PWB R3, C203, 
and D7.
No
Yes
Data input 
(USB PWB IC3, pins 7 and 8)?
Check the path from USB 
PWB CN1 to IC3.
No
Yes
Data output 
(USB PWB IC3, pins 9, 10, 12, 
and 13)?
Check the path from USB 
PWB IC3 to CN2.
No
USB is inoperative.
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Here you can read online and download Sharp LL-T1512W (serv.man5) Service Manual in PDF. LL-T1512W (serv.man5) service manual will guide through the process and help you recover, restore, fix, disassemble and repair Sharp LL-T1512W (serv.man5) 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.