XV-DV353
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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
(DVDMAIN Assy) disconnected or damaged ?
Connector / cable
Check that the following voltage is output :
Q1202-source on the 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 97 (MDATA) and pin 98 (SCLK)
on the DVDMAIN Assy ? (in the range of 0-3V)
DVDMAIN Assy
DVD IC (IC201)
Are the signals input into IC5501-pin 50 (MDATA) and pin 51 (SCLK)
on the DVDMAIN Assy ? (in the range of 0-3V)
DVDMAIN Assy
UCOM (IC5501)
Check that the following voltage are output :
Q1302-collector on the DVDMAIN Assy: 5V
DVDMAIN Assy
5V Regulator IC (IC751)
Is a resonator (X201: 27MHz) on the DVDMAIN Assy oscillating ?
DVDMAIN Assy
Crystal resonator (X201)
DVD IC (IC201)
• Is a signal input into IC203-pin26 (PCE#) on the 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 DVDMAIN Assy ?
(Is a signal fluctuating ?)
→
Communication with SDRAM
DVDMAIN Assy
DVD IC (IC201)
Flash ROM (IC203)
SDRAM (IC202)
Is a signal output from IC203-pin 28 (PRD#) on the DVDMAIN Assy?
(Is a signal fluctuating for several hundred mS after the power is turned
on ?)
DVDMAIN Assy
Flash ROM (IC203)
Is a signal input into IC5501-pin 67 (DVD ACK) on the DVDMAIN
Assy ? (Is a signal fluctuating ?)
→
Communication with FL Control IC
DVDMAIN Assy
DVD IC (IC201)
UCOM (IC5501)
Is a signal output from IC5501-pin 78 (XREADY) on the DVD MAIN
Assy ? (Is a signal fluctuating in the range of 0-5V ?)
DVDMAIN Assy
UCOM (IC5501)
Are the signals output from IC5501-pin 49 (SDATA) on the DVD MAIN
Assy ? (in the range of 0-5V)
DVDMAIN Assy
DVD IC (IC201)
UCOM (IC5501)
Are the signals of IC204-pin 5 (SDA) and pin 6 (SCL) on the DVD
MAIN Assy fluctuating for one or two seconds after the power is
turned?
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 (DVDMAIN Assy IC201)
and video-out terminal (see the block diagram)
DVDMAIN Assy
Video circuit after DVD IC
(IC201)
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