DV-L70 (serv.man3). Trouble shooting guide - Sharp DVD Service Manual (repair manual)

dv-l70 (serv.man3) service manual
Model
DV-L70 (serv.man3)
Pages
4 Few pages! See other manuals at the bottom of the first or last page.
Size
51.18 KB
Type
PDF
Document
Service Manual
Brand
Device
DVD / Trouble shooting guide
File
dv-l70-sm3.pdf
Date

Read Sharp DV-L70 (serv.man3) Service Manual online

DV-L70S
DV-L70BL
DV-L70W
16
8.
 TR
OUBLESHOO
TING
Flow Chart NO.2
Flow Chart NO.3
NO
3.2V and 4.95V are not output to the pins 2 - 3 
and pins 6 - 8 of connector CN9002, respectively.
YES
The power is not turned on.
Check the DC jack and fuse F9001.
NO
Is almost the same voltage as the input voltage being 
applied to the source pins 1 - 3 of FET-TrQ9006?
YES
Check the IC9001 and FET-TrQ9004.
NO
Is the pulse being applied to the gate pin 4 of 
FET-TrQ9006? Or, is the voltage 1.5V or less?
Check the FET-TrQ9003, D9003 and L9003.
YES
Check the switch SW9001.
NO
Is the voltage of gate pin 4 of FET-TrQ9006 1.5V 
or less?
YES
Check the FET-TrQ9006.
NO
Is almost the same voltage as the input voltage 
being output to the drain pins 5 - 8 of Q9006?
YES
Are the connector CN9002 and FFC wire normal?
NO
Is the "H" voltage being applied to the pin 1 of 
connector CN9002?
YES
YES
Check the IC9001 and FET-TrQ9002.
NO
Is the pulse being applied to the gate pin 4 of 
FET-TrQ9001? Or, is the voltage 1.5V or less?
NO
Check the IC3200 and IC3205 on the main PWB.
(Power-H line.)
Check the IC9001, Q9005, D9004 and D9005.
4.95V is not being output.
Check the fuse F9002.
NO
Is almost the same voltage as the input voltage being 
applied to the source pins 1 - 3 of FET-TrQ9001?
YES
3.2V is not being output.
Is the control voltage normally into the pins 95 
and 96 of IC504? (95pin-key1, 96pin-key2)
Replace key switch.
Is key switch contact and installation state?
YES
YES
Check the peripheral circuit or replace IC504.
YES
Check the FET-TrQ9001, D9002 and L9002.
Key manipulation on the DVD function side doesn't function.
FLOW CHART NO.1
FLOW CHART NO.2
FLOW CHART NO.3
FLOW CHART NO.4
NO
The key matrix circuit of IC3200 is checked.
30~27pins(S0~S3), 26, 25,20pins(K0~K3), D3102, 
D3103~3108
Replace key switch.
Is key switch contact and installation state?
YES
YES
Check the main PWB unit of IC3200 and IC3205.
Key manipulation on the LCD function side doesn't function.
FLOW CHART NO.5
When S1001 is pressed, are the pins 1 and 2 
short-circuited?
NO
NO
YES
Is the tray lid open?
Replace the S1001.
Check the M_4.8V line.
The disc does not rotate.
FLOW CHART NO.7
NO
NO
NO
NO
Is 4.8V voltage supplied to the pin 2 terminal of
remote control receiver?
Replace the remote control receiver or replace the
remote control transmitter is necessary.
Operation is possible from the DVD, but no 
operation is possible from the infrared remote
control.
YES
Is the "L" pulse sent out pin 3 terminal of receiver 
when the infrared remote control is activated?
YES
Check 5V line. (IC3205)
Replace the remote control receiver.
YES
Is pulse signal supplied to the pin 32 of IC504 
and the pin 40 of IC3200?
Check the line between the remote control receiver 
and the pin 32 of IC504 and the pin 40 of IC3200.
YES
Check IC504, IC3200, IC3205 and their periphery.
NO
NO
NO
Does the pickup move in the direction of inner 
periphery?
YES
After moving in the direction of inner periphery, 
does the pickup move in the direction of outer 
periphery?
YES
Check the connection between pins 2 or 4 of S1001 
and pins 27 of IC504.
Check the cable connecting to the CN302.
(Check the CN302 and line of pins 2 and 3 of IC702.)
YES
Is 4.8V being applied to the pins 16 and 17 of 
IC701?
Check the cable connecting to the CN702.
(Check the line of pins 1 and 2 of CN702.)
YES
Check IC701 their periphery.
No operation is possible from the infrared remote control.
FLOW CHART NO.6 
17
DV-L70S
DV-L70BL
DV-L70W
YES
NO
YES
In case of DVD:Is the input signal supplied to the 
pins (58, 63), (59, 64), (60, 3) and (61, 2)of IC303?
In case of CD: Is the input signal supplied to the pins 
(49, 55), (50, 54), (52, 53), 46 and 47 of IC303?
NO
Is the FE signal output to the pin 21 of IC303?
Check the connection of optical pickup cable.
If it is normal, replace the optical pickup cable.
Refer to "The disc is not recognized. (When the 
focus servo does not function)".
NO
When the playback button is pressed while both 
tray switch(S1001) and LD switch(S502) are held 
down with a disc loaded, the disc rotates but stops 
immediately.
YES
The disc is not recognized.
(In case of focus error)
FLOW CHART NO.8
NO
NO
The disc is not recognized.
(When the focus servo does not function)
FLOW CHART NO.9
NO
NO
NO
YES
Is the focus control signal being output to the pin 
43 of IC707?
Check the line between pin 21 of IC303 and pin 
38 of IC707.
Is the FE signal being input to the pin 38 of IC707?
(Check item for the symptom)
YES
Check the connection of optical pickup cable.
If it is normal, replace the pickup.
YES
YES
Check the power supply peripheral circuit.
If it is normal, replace the IC707.
NO
Is the focus control drive voltage being applied to 
the pins 4 and 2 of CN301?
Check the line between IC707 and IC702.
Is the voltage of 4.8V being applied to the pins 5 
and 20 of IC702?
NO
Check the M_4.8V line.
Replace the IC702.
Check the line between IC702 and connector CN301.
Is the focus control voltage being output from the 
pins 24 and 25 of IC702?
Is the focus control voltage being input to the pin 
17 of IC702?
YES
NO
Is the drive signal (SEL) of Q301 (LD POWER 
ON) being output from the pin 52 of IC707?
Is the drive signal (LDO1) of Q307 (LD POWER 
CTL) being output to the pin 45 of IC303?
When S502 is pressed, is the base of Q309 0.8V?
NO
NO
NO
Is the voltage of 3.4V being applied to the emitter 
of Q308?
NO
Is the drive signal (LDO2) of Q308 (LD POWER 
CTL) being output to the pin 4 of IC303?
When S502 is pressed, is the base of Q309 0.8V?
YES
The CD disc is not recognized.
(When the laser beam does not go on)
FLOW CHART NO.11
The DVD disc is not recognized.
(When the laser beam does not go on)
FLOW CHART NO.10
NO
NO
Is the voltage of 3.1V being applied to the emitter 
of Q301? And, is the voltage of 3.4V being applied 
to the emitter of Q307?
YES
Is the voltage of 3.1V and 2.3V being applied to 
the pins 14 and 23 of CN301, respectively?
Check the line between the pin 4 of IC303 and 
base of Q308.
Check the line between S502 and R397.
YES
Check the D_3.1V line and A_4.8V line. (Q309)
Check the A_4.8V line. (Q309)
YES
Check the connection of optical pickup cable.
If it is normal, replace the pickup.
Check the Q301 and line between Q307 and 
CN301.
NO
Is the voltage of 2.3V being applied to the pin 9 
of CN301?
YES
Check the line between Q308 and CN301.
Check the connection of optical pickup cable.
If it is normal, replace the pickup
YES
Check the line from the pin 52 of IC707, through 
Q304, to the base of Q301.
Check the line between the pin 45 of IC303 and 
base of Q307.
Check the line between S502 and R397.
NO
YES
NO
NO
Is it possible to hold normally the disc with the 
check?
Set the disc on the disc tray.
YES
Replace the main pwb unit.
YES
YES
Check the loading switch (S502).
Replace the optical pickup unit.
It is laundered by the disk cleaner.
Is the level of RF signal which is output from the 
pin 28 of IC303, normal?
Check for contamination of objective lens of optical 
pickup.
YES
Does a signal come out in the following, each 
output terminal of the integrated circuit?
Picture signal
IC201   4pin   Y-SIG.
IC201   7pin   C-SIG.
Sound signal
IC801   16pin   AUDIO(L-CH)-SIG.
IC801   13pin   AUDIO(R-CH)-SIG.
Both picture and sound do not oper
ate nor
mally
.
FLOW CHART NO.12
DV-L70S
DV-L70BL
DV-L70W
18
NO
Does a signal come out in the following, each 
output terminal of the integrated circuit?
Picture signal
IC2102   12pin   Y-SIG.
IC2102   8pin     C-SIG.
IC2102   10pin   CVBS-SIG.
NO
NO
Are the video signals inputted to the pins of LCD 
DECODER IC1801.
IC1801   3pin   Y-SIG.
IC1801   5pin   C-SIG.
NO
NO
A disk is set on the tray, and played back.
It confirms that there is no problem by flowchart 
NO.12.
YES
A video signal doesn't come out in the outside 
projected image output terminal (J6002).
FLOW CHART NO.13
Check the peripheral circuit of IC1801.
YES
Doesn't the voltage adjustment of the line come off
+7.5V? If it deviates, it is readjusted with R1102.
Check the peripheral circuit of IC2102, Q1805, 
Q2102, D2301, D2303.
NO
Check the line between the pin 4 of IC201 and 
pin 3 of IC1801. (Q203~204, IC2101, Q1801, 
Q1807, Q1808)
Check the line between the pin 7 of IC201 and 
pin 5 of IC1801. (Q201~202)
NO
Do 19 of IC1801, 21, 24 pin (VR, VG, VB) output 
appear?
YES
LCD panel peripheral circuit and the existence of 
the failure place of the appearance are confirmed.
YES
A LCD panel power circuit and rogic circuit are 
examined. (IC1000, Q1100, T1100, etc.)
Is a power source being supplied to the LCD panel 
normally?
VGH(+13V), VSS(-16V), VCC(-10.9V), VSH(4.8V),
VGL(-10V)
YES
NO
COMMON AMP., CURRENT DET. circuit are 
examined. (Q1102~1103, IC1103, etc.)
YES
COMMON Doesn't AMP. adjustment come off? 
If it deviates, it is readjusted based on the GPOS 
adjustment.
Is the COM2 bias level of the LCD panel normal?
YES
NO
Check the peripheral circuit of IC1101.
Is TFT LCD CONTROL PROCESSOR (IC1101) 
normal?
YES
The outside output terminal (J6002) peripheral is 
checked from pins 12 and 8 of IC2102.
The VIDEO DRIVER circuit composed of Q2201,
Q2206 is examined.
Picture do not oper
ate nor
mally
.
FLOW CHART NO.14
Does 7 pin of IC1801 gain the control voltage
(about 3.1V) of TINT?
YES
YES
NO
Is the outside horizontal synchronizing of 34 pin of 
IC1801 normal?
NO
NO
Is (the 14,16 pin of IC1801) doing oscillation 
(4.43MHz) with VCO of the chroma circuit 
normally?
YES
NO
NO
NO
NO
Is the voltage of pins 5, 6, 7, and 8 of TP1191 
normal?
Is the backlight going on?
YES
YES
Is each voltage of CN1105 normal?
Is the oscillation of inverter normal?
NO
Check the pin 49 of IC3200 and pin 9 of IC3201.
Replace the inverter unit.
Check the periphery of IC1000, Q1100 and T1100.
Is TFT LCD CONTROL PROCESSOR (IC1101) 
normal?
YES
LCD panel peripheral circuit and the existence of 
the failure place of the appearance are confirmed.
Check the periphery of IC1101.
NO
Check the periphery circuit 7 pin of IC1801.
NO
The readjustment of white balance is done.
Check the peripheral circuit 6 pins of IC1801.
Replace the backlight.
Is white balance normal?
YES
NO
Check the chroma periphery circuit of IC1801.
Are 19 of IC1801, 21, 24 pin (VR, VG, VB) output 
normal?
YES
Check the LCD panel unit.
YES
NO
Check the chroma periphery circuit of IC1801.
Are 19 of IC1801, 21, 24 pin (VR, VG, VB) output 
normal?
NO
Check the LCD panel unit.
NO
Check the periphery circuit of X1801 and pins 14, 
16 of IC1801.
Does 6 pin of IC1801 gain the control voltage 
(about 3.0V) of COLOUR?
YES
No picture
FLOW CHART NO.15
Colour of the picture image is abnormal.
FLOW CHART NO.16
A colour doesn't ha
v
e
 it about the picture image
.
FLOW CHART NO.17
Check the pins 38, 44, 43 of IC1101 and L1109, 
D1105, IC1102, Q1101,  etc.
19
DV-L70S
DV-L70BL
DV-L70W
NO
Is a signal being inputted to the following, each 
output terminal of the integrated circuit?
IC6000   3pin   AUDIO(L-CH)-SIG.
IC6000   5pin   AUDIO(R-CH)-SIG.
Set the disc on the disc tray.
It confirms that there is no problem by flowchart 
NO.12.
YES
The control signal line of IN_H is checked.
NO
Check the line between the pins 16, 13 of IC801 
and pins 3, 5 of IC6000.
YES
YES
The control peripheral circuit of IN_H is examined 
in each of 9 of IC6203 and IC6202, the 10 pin.
YES
The control signal line of SMUT is checked.
NO
Is a signal being inputted to the following, each 
output terminal of the integrated circuit?
IC6203   2, 5pin   AUDIO(L-CH)-SIG.
IC6202   5pin       AUDIO(R-CH)-SIG.
YES
Check the line between the pins 1, 7 of IC6000 and 
pins 2, 5 of IC6203 and IC6202.
NO
Does a signal come out in the following, each 
output terminal of the integrated circuit?
IC6203   2, 5pin   AUDIO(L-CH)-SIG.
IC6202   4pin       AUDIO(R-CH)-SIG.
YES
Is the control signal of IN_H added to each of 9 of 
IC6203 and IC6202, the 10 pin?
NO
Is a signal being inputted to the following, each 
output terminal of the integrated circuit?
IC6203   12pin   AUDIO(L-CH)-SIG.
IC6202   12pin   AUDIO(R-CH)-SIG.
YES
The line of the space to 12 pin of IC6203, IC6202 is 
checked through sound volume (R6010) from 4 pin 
of IC6203, IC6202.
NO
Is a signal being inputted to the following, each 
output terminal of the integrated circuit?
IC6002   2pin   AUDIO(L-CH)-SIG.
IC6002   6pin   AUDIO(R-CH)-SIG.
The actuation of the audio mute circuit of Q2004, 
Q2005, Q6615, Q6616 is checked.
YES
Sound do not oper
ate nor
mally
.
FLOW CHART NO.19
YES
YES
YES
NO
NO
NO
Is the PDP signal of 38 pin of IC1101 normal?
Is the synchronizing signal of 7 pin of IC1101 
normal?
YES
YES
Is a synchronizing signal being inputted to 36 pin of 
IC1801?
Is a synchronizing signal being outputted to 3 pin 
of IC1900?
NO
Check the betweenthe emmiter and pin 36 of IC1801.
Check the pins 38, 44, 43 of IC1101 and pins 
L1109, D1105, IC1102, Q1101, etc.
Check the peripheral circuit pins 71, 70 of IC1101,
C1122 and R1103 (image plane center position).
Is the horizontal position of the picture image 
normal?
YES
The readjustment of R1103 (SCREEN. CENTER 
POS.) is done.
SYNC SEPA. (IC1900), Q1900 and MONO MULTI
(IC1901), IC1902, IC1801 are checked.
The synchronism of the picture image can't be tak
en.
FLOW CHART NO.18
Replace the IC1900.
Check the LCD panel unit.
The headphone audio output is not emitted.
FLOW CHART NO.21
Check or replace IC6002 (AUDIO POWER OUT) 
and IC6601 (POWER REG.)
The control signal line of SMUT is checked.
The control signal line of IN_H is checked.
NO
YES
The control peripheral circuit of IN_H is examined 
in each of 9 of IC6203 and IC6202, the 10 pin.
Is the control signal of IN_H added to each of 9 of 
IC6203 and IC6202, the 10 pin?
NO
YES
YES
Check or replace speaker.
YES
Check the outside output terminal (J6000).
YES
Check the headphone output terminal (J6001).
YES
Does a signal come out in the following, each 
output terminal of the integrated circuit?
IC6002   16, 13pin   AUDIO(L-CH)-SIG.
IC6002   12, 9pin     AUDIO(R-CH)-SIG.
NO
NO
Does a signal come out in the following, each 
output terminal of the integrated circuit?
IC6203   3, 15pin   AUDIO(L-CH)-SIG.
IC6202   3, 15pin   AUDIO(R-CH)-SIG.
Check the periphery circuit of IC6602.
NO
Does a signal come out in the following, each 
output terminal of the integrated circuit?
IC6602   1pin   AUDIO(L-CH)-SIG.
IC6602   7pin   AUDIO(R-CH)-SIG.
The outside output audio doesn't come out.
 
(Speak
er audio comes out.)
FLOW CHART NO.20
The actuation of the audio mute circuit of Q2004, 
Q2005, Q6615, Q6616 is checked.
The control signal line of SMUT is checked.
NO
The actuation of the audio mute circuit of Q2004, 
Q2005, Q6012, Q6013 is checked.
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