LC-15B2EA (serv.man5). Troubleshooting table (p.12-17) - Sharp TV Service Manual (repair manual)

lc-15b2ea (serv.man5) service manual
Model
LC-15B2EA (serv.man5)
Pages
6
Size
19.5 KB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD / Troubleshooting table (p.12-17)
File
lc-15b2ea-sm5.pdf
Date

Read Sharp LC-15B2EA (serv.man5) Service Manual online

12
LC-15B2EA
TROUBLE SHOOTING TABLE
No picture, No sound
Check all the settings microprocessor's adjust process menu.
Do F1 and F2 function?
Are T3701's secondary 
outputs +31V, +22V, +9V, 
+5V and -8V normal?
Remove F1 and F2 and 
check the load side.
Is there short-circuiting?
Is there short-circuiting of 
T3701 primary side periphery, 
Q3700, Q3701 and S4701?
Replace F1 and F2.
Check S4701 and 
connection cable.
Is T3701's primary oscillator 
waveform normal?
Check T3701's secondary 
load.
Yes
Yes
No
No
No
No
Yes
Check J3702 periphery and 
connection cable.
Yes
Back light lamp failure to light up
Replace F6500 and F6501.
Is the pin (34) of IC1201 in 
the "H" state?
Is the primary side of 
T6500~T6503 periphery 
short-circuiting?
Replace the back light lamp 
with new one and check 
again.
Yes
Yes
No
No
Yes
Check the OFL1 line, IC1201 
and their peripheral parts.
Check T6500~T6503, 
Q6500~Q6505 and 
connection cable.
13
LC-15B2EA
TROUBLE SHOOTING TABLE
 (Continued)
No picture (1)
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 
S-Video
output
Is voltages at 
pins (6), (7) and 
(18) tuner 
normal?
Is output at pin 
(13) of tuner 
normal?
Check the 
power line.
Check tuner 
and its 
peripheral parts.
Is input at pin 
(3) of IC402 
normal?
Is the pins (2) 
and (4) of IC402 
at "H" and "L" 
state?
Yes
Yes
No
No
No
No
No
Yes
No TV output
Is the pins (65) 
and (66) of 
IC2001 at "H" 
and "L" state?
Yes
Check the its 
line.
Check the its 
line.
Check IC402 
and its 
peripheral parts.
Is input at pin 
(75) of IC801 
normal?
Check V1 IN 
line and its 
peripheral parts.
No
No VIDEO 2 
output
14
LC-15B2EA
TROUBLE SHOOTING TABLE
 (Continued)
No picture (2)
Check all the settings microprocessor’s adjust process menu.
Is input at pin 
(74) of IC801 
normal?
Check the AV2 
line and its
peripheral parts.
Check the W9, 
SY-line, SC-line 
and their 
peripheral parts.
No
No VIDEO 1
output
Is input at pin (1) 
of IC402 and pin 
(71) of IC801 
normal?
No
No S-VIDEO 
output
Check IC1203 
and its
peripheral parts.
No
No
Yes
Yes
Yes
No TELETEXT 
output
Yes
Is input at pins (2), 
(5), (11), and (14) 
of IC1203 normal?
Is input at pins (3), 
(4) and (5) of 
SC1602 normal?
Is output at pins (1) 
and (7) of IC1619 and 
pin (1) of IC1620 
normal?
No
Check connection 
cable
Check the R, G 
and B line.
No
Check IC1619, 
IC1620 and their 
peripheral parts.
Is output at pins 
(57)~(59) of IC1601 
normal?
No
Yes
Check V2V0 line 
and its peripheral 
parts.
Is input at pin (21) of 
IC1601 normal?
Check IC1601 and its 
peripheral parts.
15
LC-15B2EA
TROUBLE SHOOTING TABLE
 (Continued)
No picture (3)
Check all the settings microprocessor's adjust process menu.
Is output of 
R0~R7 
normal?
Is output of 
G0~G7
normal?
Is output of 
B0~B7 
normal?
Yes
Yes
No
No
No
Colour is 
unusual
Is in/output of 
SPIO and 
SPOI normal?
No
No picture
image 
inversion
No
Gradation
defect
Is output of U/D
 normal?
Yes
No
Check R1202 and 
its peripheral parts.
Check R1209 and 
its peripheral parts.
Check IC1206, 
IC1207, Q1201 and 
their peripheral 
Check R1203 and 
its peripheral parts.
Check R1204 and 
its peripheral parts.
Is output V0, V7, V17, 
V21, V32, V64, V112, 
V176, V235 and 
V255 normal?
Check IC1106, 
IC1107, IC1108, 
IC1114, IC1115 and 
their peripheral parts.
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Here you can read online and download Sharp LC-15B2EA (serv.man5) Service Manual in PDF. LC-15B2EA (serv.man5) service manual will guide through the process and help you recover, restore, fix, disassemble and repair Sharp LC-15B2EA (serv.man5) 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.