XV-DV333
75
5
6
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 CN901
(DVDM Assy) disconnected or damaged ?
Connector / cable
Check that the following voltage is output :
+ side of C739 : 3.3V
DVDM Assy
3.3V Regulator IC (IC341)
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 DVDM Assy ? (in the range of 0-3V)
DVDM Assy
DVD IC (IC201)
Are the signals input into IC5501-pin 50 (MDATA) and pin 51 (SCLK)
on the CONTROL Assy ? (in the range of 0-3V)
CONTROL Assy
UCOM (IC5501)
Check that the following voltage are output :
IC751-pin 1 on the DVDM Assy : 5V
DVDM Assy
5V Regulator IC (IC751)
Is a resonator (X201: 27MHz) on the DVDM Assy oscillating ?
DVDM Assy
Crystal resonator (X201)
DVD IC (IC201)
• Is a signal input into IC203-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 IC202-pin 16 (DWE#), pin 19 (DCS#)
and pin 38 (SDCLK) on the DVDM Assy ?
(Is a signal fluctuating ?)
→
Communication with SDRAM
DVDM Assy
DVD IC (IC201)
Flash ROM (IC203)
SDRAM (IC202)
Is a signal output from IC203-pin 28 (PRD#) on the DVDM Assy?
(Is a signal fluctuating for several hundred mS after the power is turned
on ?)
DVDM Assy
Flash ROM (IC203)
Is a signal input into IC5501-pin 67 (DVD ACK) on the CONTROL
Assy ? (Is a signal fluctuating ?)
→
Communication with FL Control IC
DVDM Assy
DVD IC (IC201)
CONTROL Assy
UCOM (IC5501)
Is a signal output from IC5501-pin 30 (XREADY) on the CONTROL
Assy ? (Is a signal fluctuating in the range of 0-5V ?)
CONTROL Assy
UCOM (IC5501)
Are the signals output from IC5501-pin 49 (SDATA) on the CONTROL
Assy ? (in the range of 0-5V)
DVDM Assy
DVD IC (IC201)
CONTROL Assy
UCOM (IC5501)
Are the signals of IC204-pin 5(SDA) and pin 6(SCL) on the DVDM Assy
fluctuating for one or two seconds after the power is turned ?
DVDM Assy
EEPROM (IC204)
3
An opening screen is not
displayed on the monitor
(The FL display lights. The
mechanism works.)
Check the video signal path between DVD IC (DVDM Assy IC201) and
video-out terminal (see the block diagram)
DVDM Assy
Video circuit after DVD IC
(IC201)
