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