LC-15M4E (serv.man3). - Part 2 - Troubleshooting (17-21) - Sharp TV Service Manual (repair manual)

lc-15m4e (serv.man3) service manual
Model
LC-15M4E (serv.man3)
Pages
5 Few pages! See other manuals at the bottom of the first or last page.
Size
18.32 KB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD / - Part 2 - Troubleshooting (17-21)
File
lc-15m4e-sm3.pdf
Date

Read Sharp LC-15M4E (serv.man3) Service Manual online

17
LC-15M4E
TROUBLE SHOOTING TABLE
No picture, No sound
Check all the settings microprocessor's adjust process menu.
Do F701 function?
Are T701's secondary 
outputs, +34V, +15V, +10V, 
+5V and -9V normal?
Remove F701 and 
check the load side.
Is there short-circuiting?
Is there short-circuiting of 
T701 primary side periphery, 
Q701, Q703 and S4101.
Replace F701.
Check S4101 and 
connection cable.
Is T701's primary oscillator 
waveform normal?
Check T701's secondary 
load.
Yes
Yes
No
No
No
No
Yes
Fluorescent lamp failure to light up
Does F703 function?
Replace F703.
Is the pin (34) of IC1201 in 
the "H" state?
Is the Q3603 short-circuiting?
Is there short-circuiting of 
T1771 and T1772 primary side 
periphery, Q1771~Q1773.
Yes
Yes
No
No
No
Yes
Replace the fluorescent lamp 
with new one and check 
again.
Yes
Check the OFL1 line, IC1201 
and their peripheral parts.
Check Q1774 and their 
peripheral parts.
Check T1771, T1772, 
Q1771~Q1773 and 
connection cable.
No
18
LC-15M4E
TROUBLE SHOOTING TABLE
 (Continued)
No picture
Check all the settings microprocessor's adjust process menu.
Is in/output of 
IC801 normal?
Is in/output of
IC1201 normal?
Check IC801
and its 
peripheral parts.
Check IC1201 
and its 
peripheral parts.
Check IC402 
and its 
peripheral parts.
Check IC801, 
AV1 line and its 
peripheral parts.
Check LCD 
panel voltages 
and waveform.
Yes
Yes
No
No
No picture 
at all
Is in/output of 
IC402 normal?
Is input at pin 
(73) of IC801 
normal?
Yes
No
No
No TV and 
VIDEO 1 
output
Is input at pin 
(1) of IC402 
normal?
Is the pins (2) 
and (4) of IC402 
at "L" state?
Check the its 
line.
Check the its 
line.
Check IC402 
and its 
peripheral parts.
Is the pins (65) 
and (66) of IC2001 
at "L" state?
Yes
Yes
No
No
No
No VIDEO 1 
output
Is input at pin 
(5) of IC402 
normal?
Is the pin (4) 
of IC402 
at "H" state?
Check the its 
line.
Check the its 
line.
Is the pin (68) 
of IC2001 
at "H" state?
Check IC402 
and its 
peripheral parts.
Yes
Yes
Yes
No
No
No VIDEO 2 
output
19
LC-15M4E
TROUBLE SHOOTING TABLE
 (Continued)
No picture
Check all the settings microprocessor's adjust process menu.
Is source GND 
normal?
Is CSCOM 
waveform 
normal?
Check R1212 
and its
peripheral parts.
Check IC1109, 
Q1101, Q1102, 
D1101, R1120, 
R1130 and their 
peripheral parts.
Check R1231 
and its
peripheral parts.
Yes
No
No
Becomes
dark
No
Time passes,
becomes 
dark
Is gate GND 
normal?
Check R1223 
and gate aray 
peripheral parts.
Yes
Check D1201 
and its
peripheral parts.
No
Is B-5.5V being 
outputted?
Is VCC being 
outputted?
Check T701's 
secondary +5V
outputs line.
Yes
No
Is GSP 
waveform 
normal?
Check R1223 
and its
peripheral parts.
Is gate clock
(GCK) normal?
Is output at pin
(3) of IC1205
noeml?
No
Yes
No
Becomes
white.
Is 3.3V VSH 
being 
outputted?
Is source clock 
(CK) normal?
Check +3.3V 
outputs line of 
IC781.
Check R1210, 
R1211 and their 
peripheral parts.
Check FB1203 
and gate aray 
peripheral parts.
Is output of LBR 
and HG 
normal?
Yes
Yes
Yes
No
No
No
Vertical line 
output
20
LC-15M4E
TROUBLE SHOOTING TABLE
 (Continued)
No picture
Check all the settings microprocessor's adjust process menu.
Is output of 
R0~R5 
normal?
Is output of 
G0~G5 
normal?
Is output of 
B0~B5 
normal?
Check R1202,  
R1203 and their 
peripheral parts.
Check R1204,  
R1205 and their 
peripheral parts.
Check R1206,  
R1207 and their 
peripheral parts.
Check T701's 
secondary +5V 
outputs line.
Yes
Yes
No
No
Colour is 
unusual
Is VLS 5V 
being 
outputted?
No
Picture 
image is 
gloomy
Is in/output of 
SPIO and 
SPOI normal?
Check R1209 
and their 
peripheral parts.
No
No picture
image 
inversion
Is output V0, 
V16, V32, V48 
and V63 
normal?
Check IC1106, 
IC1107, IC1108 
and their 
peripheral parts.
No
Gradation
defect
Is output of U/D
 normal?
Check Q1201 
and their 
peripheral parts.
Yes
No
Page of 5
Display

Download Sharp LC-15M4E (serv.man3) Service Manual (Repair Manual)

Here you can read online and download Sharp LC-15M4E (serv.man3) Service Manual in PDF. LC-15M4E (serv.man3) service manual will guide through the process and help you recover, restore, fix, disassemble and repair Sharp LC-15M4E (serv.man3) LCD. Information contained in service manuals typically includes schematics / circuit diagrams, wiring diagrams, block diagrams, printed wiring boards, exploded views, parts list, disassembly / assembly, pcb.