DV-285-S
55
5
7
8
5
6
7
8
C
D
F
A
B
E
7.1.7 TROUBLE SHOOTING
No.
Symptoms
Diagnosis Contents
Possible Defective Points
1
The power is not turned on.
Check the voltage of AT+3.3V, –28V and FLDC on the POWER
SUPPLY Unit.
POWER PCB ASSY
Are wires of output connector (POWER PCB ASSY) and CP4003
(DVDM Assy) disconnected or damaged ?
Connector / cable
Check that the voltage at IC651-pin 10 (K 1) on the FLKY Assy
becomes about 2.7V when the POWER key is pressed and 0 V when it
is released.
OPERATION 2 Assy
Tact SW
(when operation of only the
POWER key on the main unit is
not accepted)
Check that the voltage at OS651-pin 1 (IR) on the OPERATION1 Assy
is in the range between 0 and 3.3 V while receiving signals from the
remote control unit when any key on it is pressed.
FLKY Assy
Remote receiver section
(when operation of only the
POWER key on the remote
control unit is not accepted)
2
An opening screen is not
displayed on the monitor
(The FL display lights. The
mechanism does not work.)
• Check the voltage of E+6.8V and SW+3.3V on the POWER SUPPLY
Unit.
• Check the voltage of P.ON-H is about 2.8V on the POWER SUPPLY
Unit.
POWER SUPPLY Unit
Check that the following voltage are output :
IC4006-pin 5 : 1.8V, on the DVD MT PCB Assy.
DVD MT PCB Assy
1.8V Regulator IC (IC4006)
Is a resonator (X4001 : 27MHz) on the DVDM Assy oscillating ?
DVD MT PCB Assy
Crystal resonator (X4001)
• Is a signal input into IC4004-pin26 (PCE#) on the DVDM Assy ?
(Is a signal "H" for 80 mS and then "L" after the power is turned
on ?)
→
Communication with flash ROM.
• Are the signals input into IC4005-pin 16 (DWE#), pin 19 (DCS#)
and pin 38 (SDCLK) on the DVDM Assy ?
(Is a signal fluctuating ?)
→
Communication with SDRAM
DVD MT PCB Assy
DVD IC (IC4001)
Flash ROM (IC4004)
SDRAM (IC4005)
Is a signal output from IC4004-pin 28 (PRD#) on the DVD MT Assy?
(Is a signal fluctuating for several hundred mS after the power is turned
on ?)
DVD MT PCB Assy
Flash ROM (IC4004)
Are the signals of IC4001-pin 5(SDA) and pin 6(SCL) on the DVDM
Assy fluctuating for one or two seconds after the power is turned ?
DVD MT PCB Assy
EEPROM (IC4002)
Check the video signal path between DVD IC (DVD MT Assy IC4002)
and video-out terminal (see the block diagram)
DVD MT PCB Assy
Video circuit after DVD IC
(IC4001)
www. xiaoyu163. com
QQ 376315150
9
9
2
8
9
4
2
9
8
TEL 13942296513
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
