Samsung HL-R4667W Service Manual page 140

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13-3-4 Engine Failure Inspection Flow Chart for the DMD Board
No.
1) When the power cord is plugged in,
1
2) DC 330V is automatically supplied to the ballast.
1) When the power key is pressed via the remote control,
the micom of the analog board outputs high (5V) PWR signals.
2
2) The power board operates normally.
5V and 12V are supplied to the DMD CN602 terminal.
1) The MTR Reset signal is supplied to the TP713 terminal of the
motor IC704 from the micom on the digital board and then the
motor starts to drive.
3
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 CN502.)
1) Check whether the signal (SCI: START CONTROL INPUT)
4
that turns on lamp #2 of CN504 on the DMD board is high (5V).
5 1) Method for checking whether the DDP1011 IC RESET is normal.
Samsung Electronics
Description
Published in Heiloo, Holland.
Key Point
Check whether the DC 330V
power is supplied to the ballast.
Check whether 5V and 12V are
＊12V must be supplied to operate the
supplied to the CN602 terminal. motor.
After the set is powered on, check
whether 5V is detected on pin
No.20 of IC704.
＊If 5V is not detected, the motor will
not operate.
→ After a while, the sound
generated by the rotating color
wheel is heard.
＊When SCI is high (5V), the lamp litz
Check whether CN504 #2 signal is
of CN504 is low (0V).
5V.
＊CN504 #2 terminal voltage changes
to pulse wave form 14 seconds after
(for 50 inch TV) the time that the volt-
age is 5V.
* When about 4 seconds have passed
If the voltage R204 is 3V, it is
after changing to pulse waveform, the
normal.
screens are displayed on the set.
9/13/15
Circuit Description
Remark
13-9