LC-20SH1E (serv.man8). (8) Trouble Shooting Table — Sharp TV Service Manual (repair manual)

Model
LC-20SH1E (serv.man8)
Pages
5 Few pages! See other manuals at the bottom of the first or last page.
Size
32.19 KB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD / (8) Trouble Shooting Table
File
lc-20sh1e-sm8.pdf
Date

View Sharp LC-20SH1E (serv.man8) Service Manual online

15
LC-20SH1E
TROUBLE SHOOTING TABLE
No
No
No
Yes
Yes
Yes
Yes
Yes
No
No
Yes
No
Yes
Yes
No
No
Yes
No
Yes
No
Yes
No picture and No sound
Back light lamp failure to light up
Replace F7701.
Is Q7702 base 
voltage at "L" 
state?
Check all output 
voltage line for 
short circuit.
Do fuse F7701 
function?
Are T7701 secondary 
output at C7720, 
C7721, C7722, C7723 
and C7725 voltage 
normal?
Check Q6700-
Q6716 and their 
peripheral parts for 
short circuiting.
Is there any short 
circuit in INV +B 
line?
Check the OFL1 
line, OFL2 line, 
IC1201 and their 
peripheral parts.
Check the OFL line, 
Q3600, Q3601 and 
their peripheral 
parts.
Check Q6700-
Q6716 and their 
peripheral parts.
Replace the back 
light lamp with new 
one and check 
again.
Do fuse F6700-
F6704 function?
Are the pins (40) 
and (138) of IC1201 
in the "H" state?
Are the outputs of 
Q3600 and Q3601 
in the "L" state?
Is the pins (4) and 
(7) of T6700-T6704 
normal?
Is the pin (10) of 
T6700-T6704 
normal?
Check the error 
amp circuit D6702-
D6711, Q6706, 
Q6713, Q6717 and 
their peripheral 
parts.
Remove F7701 and 
check the load side. 
Is there short-
circuit?
Is there any short-
circuit in T7701 
primary side 
periphery?
Check IC7702, 
IC7704 and their 
peripheral parts.
Check IC7701 and 
its peripheral parts.
Is T7701 primary 
switching waveform at 
pin (1) of IC7701 
normal?
16
LC-20SH1E
TROUBLE SHOOTING TABLE
 (Continued)
No
No
No
No
Yes
Yes
No
No
Yes
Yes
No
Yes
No
No S-Video  output
No Picture (1/3)
No picture at all.
No Video 2  output
Check the power
line.
No TV output
Is output  Q801, 
Q802 and Q803 
normal?
Is input / output 
of IC1201 
normal?
Check LCD panel 
voltages and 
waveform.
Check IC501 and 
its peripheral 
parts.
Check IC1201 
and its peripheral 
parts.
Is voltage at pins 
(7) and (9) of 
tuner normal?
Is output at pin 
(11) of tuner 
normal?
Is input / output 
of SF201 
normal?
Is output of 
IC801 normal?
Check IC801 and 
its peripheral 
parts.
Check SF201 and 
its peripheral 
parts.
Check tuner and 
its peripheral 
parts.
Is video input at 
pin (B21) of 
IC501 normal?
Check the V1_V 
line and its 
peripheral parts.
Is input at pins 
(C18) and (D18) 
of IC501 normal?
Check the V1_SY 
and V1_SC line 
and their 
peripheral parts.
17
LC-20SH1E
TROUBLE SHOOTING TABLE
 (Continued)
No
Yes
No
No
No Picture (2/3)
R/G/B
CVBS
No Video 1 Output (SCART)
Is input at pin (C18) 
of IC501 normal?
Check V1_SY line 
and its peripheral 
parts.
Is input at pins (U23), 
(V23) and (V24) of 
IC501 normal?
Check SC_R, SC_G, 
SC_B line and their 
peripheral parts.
No TELETEXT 
output
No Video from 
SCART
Check Q3908, 
Q3909 and their 
peripheral parts.
Is output at pin (B23) 
of IC501 normal?
Check IC501 and its 
peripheral parts.
Check IC501 and its 
peripheral parts.
No
No
No
Yes
Yes
No
No
Yes
No
Is output of U/D normal?
No Picture (3/3)
Color is unusual
Gradation defect
Is output R0-R7 at 
SC1202 normal?
Is output G0-G7 at 
SC1202 normal?
Is output B0-B7 at 
SC1202 normal?
Check R1205 and its 
peripheral parts.
Check R1206 and its 
peripheral parts.
Check R1207 and its 
peripheral parts.
No picture image 
Is input/output of SPIO 
and SPOI normal?
Check R1216 and its 
peripheral parts.
Check R1210 and its 
peripheral parts.
Is output V0, V7, V21, 
V64, V112, V176, V235 
and V255 normal?
Check IC1101 and its 
peripheral parts.
18
LC-20SH1E
TROUBLE SHOOTING TABLE
 (Continued)
No
No
No
Yes
Yes
No
No
Yes
Yes
No
Yes
No Sound (1/2)
Check the L_MUTE, 
SO_DEF line and their 
peripheral parts.
Check IC501 and its 
peripheral parts.
Check Q3901, Q3904, 
Q3905 and their 
peripheral parts.
Is output at pin (3) of 
D3901 in "L" state?
Is output at pins (C16) 
and (D16) of IC501 
normal?
Check the line and its 
peripheral parts.
No Sound from 
headphone
Is input at pins (2) and 
(3) of J3701 normal?
Check IC3301 and 
its peripheral parts.
Check IC501, R_IN, 
L_IN line and their 
peripheral parts. 
Muting effect is on. 
Check the SP_Mute 
line and its peripheral 
No sound from 
front speaker.
Is input at pin (9) of 
IC3301 in "H" state?
Is output at pins (C17) 
and (D17) of IC501 
normal?
Is output at pins (2), (4), 
(10) and (12) of IC3301 
normal?
Check front speaker 
and connection cable.
No  Sound  from  
output line
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Download Sharp LC-20SH1E (serv.man8) Service Manual (Repair Manual)

Here you can view online or download Sharp LC-20SH1E (serv.man8) Service Manual in pdf. This Service Manual can help you recover, restore, fix, disassemble and repair Sharp LC-20SH1E (serv.man8) LCD. Information contained in Sharp LC-20SH1E (serv.man8) service manual (repair manual) typically includes:

  • Disassembly, troubleshooting, programming, maintenance, remote, adjustment, installation and setup instructions.
  • Schematics, wiring and block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Parts list (bill of materials).