4-2
ELECTRICAL TROUBLESHOOTING GUIDE
Are the pin 44 of
5V, pin41 of 12V
respectively after the power cable
connecting?
Reset or Power Check.
Check the power(5V/12V) short.
Repair the SMPS Block
Check the LIC401(3.3V regulator IC).
Check the LIC201, LIC121.
Does the pin #1
(Reset) of LIC271 change 0V to 3.3V
at the power supply initial input
mode?
<Power>
Is the pin 5 of LIC401 3.3V?
<Reference>
1.65V(VREF) : Check pin113 of LIC121?
2.2V(HDVREF): Check pin78 of LIC121
NO
NO
YES
YES
YES
YES
Are the LX201 oscillating?
Check the LX201(16.9MHz).
Check the LIC201.
NO
Check the LIC401.
NO
Check the LIC121.
NO
Check it after connecting the power cable
only on interface cable for NO Reset or
Power ON.
YES
OK
Summary of Contents for HDR688X
Page 27: ......
Page 43: ...3 45 3 46 2 SMPS 2 CIRCUIT DIAGRAM A B C D E F G H I J K L M N O P Q R S T ...
Page 44: ...3 47 3 48 3 MPEG CIRCUIT DIAGRAM A B C D E F G H I J K L M N O P Q R S T ...
Page 45: ...3 49 3 50 4 FLASH DDR CIRCUIT DIAGRAM A B C D E F G H I J K L M N O P Q R S T ...
Page 46: ...3 51 3 52 5 RESET 1394 JEPG CIRCUIT DIAGRAM A B C D E F G H I J K L M N O P Q R S T ...
Page 47: ...3 53 3 54 A B C D E F G H I J K L M N O P Q R S T 6 ATAPI MEMORY CARD CIRCUIT DIAGRAM ...
Page 48: ...3 55 3 56 7 I O µ COM CIRCUIT DIAGRAM A B C D E F G H I J K L M N O P Q R S T ...
Page 49: ...3 57 3 58 8 TUNER MPX ADC DAC JACK CIRCUIT DIAGRAM A B C D E F G H I J K L M N O P Q R S T ...
Page 50: ...3 59 3 60 9 DECODER CIRCUIT DIAGRAM A B C D E F G H I J K L M N O P Q R S T ...
Page 51: ...3 61 3 62 10 TIMER CIRCUIT DIAGRAM A B C D E F G H I J K L M N O P Q R S T ...
Page 56: ...3 71 3 72 PRINTED CIRCUIT DIAGRAMS 1 MAIN P C BOARD TOP VIEW BOTTOM VIEW ...
Page 57: ...3 73 3 74 2 I O P C BOARD TOP VIEW ...
Page 58: ...3 75 3 76 BOTTOM VIEW 2 I O P C BOARD ...
Page 59: ...3 77 3 78 3 POWER P C BOARD ...
Page 61: ...3 81 3 82 6 HDMI P C BOARD OPTIONAL PARTS TOP VIEW BOTTOM VIEW ...
Page 78: ...4 17 2 DISC SPECIFICATION 3 DISC MATERIALS 1 DVD ROM Single Layer Dual Layer ...
Page 103: ......
Page 104: ...4 42 4 43 CIRCUIT DIAGRAMS 1 DSP CIRCUIT DIAGRAM A B C D E F G H I J K L M N O P Q R S T ...
Page 105: ...4 44 4 45 2 RF CIRCUIT DIAGRAM A B C D E F G H I J K L M N O P Q R S T ...
Page 106: ...4 46 4 47 3 DRIVE CIRCUIT DIAGRAM A B C D E F G H I J K L M N O P Q R S T ...
Page 108: ...4 50 4 51 PRINTED CIRCUIT DIAGRAMS 1 MAIN P C BOARD TOP VIEW ...
Page 109: ...4 52 4 53 2 MAIN P C BOARD BOTTOM VIEW ...
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Page 175: ......