- 3-3 -
3. Test & debug flow
TEST
Check the AC Voltage
Power PCBA(110V or 220V)
NO
Replace power PCBA or
AC transformer.
YES
Switch on the Power PCBA
Is the DC Voltage
outputs OK?
(5V,1.8V,3.3V,8V,12V)
Repair or Replace Power PCBA
NO
Make sure the main PCBA don't
short on VCCs and switch it on.
YES
Is 3.3V and 1.8V DC
outputs normal on main
PCBA?
Check the regulators or related diodes.
NO
YES
Connect to PC RS232 Cable and
update the FLASH memory code.
Update FLASH
successfully?
A
YES
NO
1. Check 27MHz system clock.
2. Check system reset circuit.
3. Check FLASH R/W enable signal PRD,RWR.
4. Check RS232 SIGNALS.
5. Check FLASH Memory related circuit.
Summary of Contents for XH-T9546
Page 1: ...DVD CD RECEIVER SERVICE MANUAL 2004 MODEL XH T9546 SERVICE MANUAL MODEL LGDVT418 CD R RW ...
Page 6: ... 1 5 SPECIFICATIONS ...
Page 7: ... 1 6 MEMO ...
Page 10: ... 2 3 3 FRONT CIRCUIT 1 2 ...
Page 11: ... 2 4 4 FRONT CIRCUIT 2 2 ...
Page 12: ... BLOCK DIAGRAM 2 5 2 6 ...
Page 13: ...2 7 2 8 SCHEMATIC DIAGRAMS FRONT SCHEMATIC DIAGRAM ...
Page 14: ...2 9 2 10 MICOM SCHEMATIC DIAGRAM ...
Page 15: ...2 11 2 12 I O SCHEMATIC DIAGRAM ...
Page 16: ...2 13 2 14 DSP SCHEMATIC DIAGRAM ...
Page 17: ...2 15 2 16 AMP SCHEMATIC DIAGRAM ...
Page 18: ...2 17 2 18 SMPS WIDE SCHEMATIC DIAGRAM ...
Page 19: ...2 19 2 20 POWER SCHEMATIC DIAGRAM ...
Page 20: ...2 21 2 22 WIRING DIAGRAMS ...
Page 21: ...2 23 2 24 PRINTED CIRCUIT DIAGRAMS MAIN P C BOARD COMPONENT SIDE ...
Page 22: ...2 25 2 26 MAIN P C BOARD SOLDER SIDE ...
Page 23: ...2 27 2 28 FRONT P C BOARD SOLDER SIDE FRONT P C BOARD COMPONENT SIDE ...
Page 24: ...2 29 2 30 POWER P C BOARD ...
Page 25: ...2 31 2 32 MEMO MEMO ...
Page 26: ... 3 1 1 Power check flow ELECTRICAL TROUBLESHOOTING GUIDE SECTION 3 DVD PART ...
Page 39: ... 3 14 FIG 7 2 DVD FIG 7 3 CD ...
Page 40: ... 3 15 FIG 7 4 CD FIG 8 1 DVD 8 FOCUS ON W VEFORM ...
Page 41: ... 3 16 FIG 8 2 CD FIG 9 1 9 SPINDLE CONTROL W VEFORM NO DISC CONDITION ...
Page 42: ... 3 17 10 TRACKING CONTROL RELATED SIGNAL System checking FIG 10 1 DVD FIG 10 2 CD ...
Page 44: ... 3 19 ADAT0 3 FIG 12 2 FIG 13 1 2 COMPOSITE VIDEO SIGNAL 13 MT1389 AUDIO OUTPUT TO PWM IC ...
Page 45: ... 3 20 FIG 14 1 14 AUDIO OUTPUT FROM PWM IC ...
Page 50: ...3 25 3 26 DVD PART SCHEMATIC DIAGRAMS MPEG SCHEMATIC DIAGRAM ...
Page 51: ...3 27 3 28 SERVO SCHEMATIC DIAGRAM ...
Page 55: ... 5 2 MODEL XHS T9546C 755 756 757 755 759 758 751 750 752 754 753 752 ...
Page 57: ... 5 4 MEMO ...
