XV-DV740
97
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DVD Section
No.
Symptoms
Diagnosis Contents
Possible Defective Points
1
An opening screen is not
displayed on the monitor
(The FL display lights. The
mechanism does not work.)
Is the level at both IC5501-pin 93 (XDVDRST) and pin 1(DVD ON/OFF)
on the CONTROL Assy "H" ?
µ
com (CONTROL IC5501)
Check the voltage of CN901-pin 28 and 29 (VPR+8) on the DVDM
Assy.
DVDM Assy CN901
Check that the following voltages are output :
IC411-pin 3 : 1.8V, IC421-pin 3 : 1.8V and IC431-pin 1 : 5V on the
DVDM Assy
Each regulator on the DVDM
Assy
Are resonators (27MHz, 20MHz) on the DVDM Assy oscillating ?
Crystal resonator
(DVDM Assy X601 and X301)
Refer to contents of an FE error displayed on the FL display.
(SRAM defectiveness, I2C communication line defectiveness, etc.)
FRONT END IC
(DVDM IC301)
• Is a signal input into IC601-pin 132 (CE3) on the DVDM Assy ?
(Is a signal fluctuating for several seconds after the power is turned on ?)
→
Communication with flash ROM
• Are the signals input into IC602-pin 16 (SMIWE), pin 19 (SMICS0)
and pin 38 (SMICLK) on the DVDM Assy ?
(Is a signal fluctuating ?)
→
Communication with flash ROM
• BACK END IC (DVDM IC601)
• Flash ROM (DVDM IC603)
• 64M SDRAM (DVDM IC602)
Is a signal output from IC603-pin 28 (CPU_OE) on the DVDM Assy?
(Is a signal fluctuating for several seconds after the power is turned on ?)
µ
com (CONTROL IC5501)
Is a signal input into IC5501-pin 67 (DVDACK) on the CONTROL Assy
?
(Is a signal fluctuating ?)
• BACK END IC (DVDM IC601)
• Flash ROM (DVDM IC603)
Is a signal output from IC5501-pin 29 and 30 (SYS_1, 2) on the AF
Assy ?
(Is a signal fluctuating in the range of 0-5V ?)
µ
com (CONTROL IC5501)
Are the signals output from IC5501-pin 23, 24 and 25 on the CONTROL
Assy? (in the range of 0-5V)
µ
com (AF IC5501) – BACK END
IC (DVDM IC601)
communication line
2
An opening screen is not
displayed on the monitor
(The FL display lights. The
mechanism does not work.)
DVDM Assy
• Video circuit
• after BACK END IC (IC601)
3
A tray cannot be opened.
(An opening screen is
displayed on the monitor)
• Are wires of CN103 on the DVDM Assy disconnected or damaged ?
Connector / wire
LOADING SW (LOAB S101)
• Is a LOAD-DRVC signal reaching ?
• Does the voltage of CN105 pin 1 change by pressing the Inside
switch.
BACK END IC (DVDM IC601)
Inside switch
Check the video signal path between BACK END IC (DVDM IC601) and
video-out terminal
(see the block diagram)
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