XV-DV350
65
5
7
8
5
6
7
8
C
D
F
A
B
E
7.1.8 DVD TROUBLE SHOOTING
No.
Symptoms
Diagnosis Contents
Possible Defective Points
1
The power is not turned on. Are wires of output connector (POWER SUPPLY Unit) and CN1001
(W51 DVDMAIN Assy) disconnected or damaged ?
Connector / cable
Check that the following voltage is output :
Q1202-collector on the W51 DVDMAIN Assy: 3.3V
POWER SUPPLY Unit
2
An opening screen is not
displayed on the monitor
(The FL display lights. The
mechanism does not work.)
Are the signals output from IC201-pin 98 (MDATA) and pin 99 (SCLK)
on the W51 DVDMAIN Assy ? (in the range of 0-3V)
W51 DVDMAIN Assy
DVD IC (IC201)
Are the signals input into IC5501-pin 50 (MDATA) and pin 51 (SCLK)
on the W51 DVDMAIN Assy ? (in the range of 0-3V)
W51 DVDMAIN Assy
UCOM (IC5501)
Check that the following voltage are output :
Q1302-collector on the W51 DVDMAIN Assy: 5V
W51 DVDMAIN Assy
5V Regulator IC (IC751)
Is a resonator (X201: 27MHz) on the W51 DVDMAIN Assy oscillating ?
W51 DVDMAIN Assy
Crystal resonator (X201)
DVD IC (IC201)
• Is a signal input into IC203-pin26 (PCE#) on the W51 DVDMAIN 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 IC202-pin 16 (DWE#), pin 19 (DCS#)
and pin 38 (SDCLK) on the W51 DVDMAIN Assy ?
(Is a signal fluctuating ?)
→
Communication with SDRAM
W51 DVDMAIN Assy
DVD IC (IC201)
Flash ROM (IC203)
SDRAM (IC202)
Is a signal output from IC203-pin 28 (PRD#) on the W51 DVDMAIN
Assy? (Is a signal fluctuating for several hundred mS after the power
is turned on ?)
W51 DVDMAIN Assy
Flash ROM (IC203)
Is a signal input into IC5501-pin 67 (DVD ACK) on the W51 DVDMAIN
Assy ? (Is a signal fluctuating ?)
→
Communication with FL Control IC
W51 DVDMAIN Assy
DVD IC (IC201)
UCOM (IC5501)
Is a signal output from IC5501-pin 30 (XREADY) on the W51 DVD
MAIN Assy ? (Is a signal fluctuating in the range of 0-5V ?)
W51 DVDMAIN Assy
UCOM (IC5501)
Are the signals output from IC5501-pin 23 (SDATA) on the W51 DVD
MAIN Assy ? (in the range of 0-5V)
W51 DVDMAIN Assy
DVD IC (IC201)
UCOM (IC5501)
Are the signals of IC204-pin 5(SDA) and pin 6(SCL) on the W51 DVD
MAIN Assy fluctuating for one or two seconds after the power is
turned?
W51 DVDMAIN Assy
EEPROM (IC204)
An opening screen is not
displayed on the monitor
(The FL display lights. The
mechanism works.)
Check the video signal path between DVD IC (W51 DVDMAIN Assy
IC201) and video-out terminal (see the block diagram)
W51 DVDMAIN Assy
Video circuit after DVD IC
(IC201)
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TEL 13942296513 QQ 376315150 892498299
