SAMSUNG HLP - 4663WX - POWER BOARD CONNECTOR PIN VOLTAGES - LIGHT ENGINE FAILURE INSPECTION
TROUBLESHOOTING
DESCRIPTION
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KEY
POINT
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REMARK
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1)
When the power cord is plugged in,
2) DC 380V is automatically supplied to the ballast.
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Check
whether the DC380V
power is supplied to the ballast.
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1)
When the power key is pressed via the remote control, the micom of the
digital board outputs high (5V) PWR signals.
2) The power board operates normally. 5V and 12V are supplied to the DMD CN105
terminal.
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Check whether 5V and 12V are supplied to the CN105
terminal.
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12V
must be supplied to operate the motor.
(The voltage of the motor driving power is 12V.)
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1)
The MTR Reset signal is supplied to the R161 terminal of the motor IC101 from
the micom on the digital board and then the
motor
starts to drive.
2)
If the color wheel rotates for a certain time and then stops, check whether
the color wheel sensor is normal. (Check
the waveform on the No.2 terminal below CN102.)
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After
the set is powered on, check whether 5V is detected on pin No.49 of IC101.
à After a while, the sound
generated by the rotating color wheel is heard.
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If 5V is not detected, the motor will not operate.
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1) Check whether the signal (SCI: START CONTROL
INPUT) that turns on lamp #2 of CN109 on the DMD board is high (5V).
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Check
whether CN109 #2 signal
is 5V.
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# When
SCI is high (5V), the lamp litz of CN109
is
low (0V).
# CN109 #2 terminal voltage changes to pulse
wave
form 14 seconds after (for 50 inch TV)
the
time that the voltage is 5V.
# When about 4 seconds have passed after
changing
to pulse waveform, the screens are
displayed on the set.
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1) Method for checking whether the DDP1010 IC RESET
is normal.
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If the voltage between R254 and R255 is 3V, it is
normal.
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POWER BOARD CONNECTOR PIN VOLTAGES
CN803
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Pin #
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1
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2
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3
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4
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5
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6
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7
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Spec
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5VA
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GND
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33VB
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GND
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Power-S/W
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N.C.
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N.C.
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Used
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Supplies DC voltage to the PCB ANALOG
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CN802
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Pin #
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1
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2
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3
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4
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5
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6
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7
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Spec
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Power-Muste
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S14.5VB
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S-GND
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S14.5VB
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S-GND
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5.7VB
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GND
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Pin #
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8
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9
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10
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11
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12
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13
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Spec
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12VB
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GND
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12VB
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GND
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70VB
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GND
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ASSEMBLY - POWER BOARD
LOCATION[POWER BOARD]
LINE FILTER
LOCATION [LINE FILTER]