Samsung HLR5078WX, Руководство по обслуживанию

Страница: 145 / 152

Circuit Description
13-8 Samsung Electronics
13-3-3 Description of Terminal Characteristics
Pin Name Description
SCTRL_BN/P B channel LVDS serial control
DCLK_BN/P B channel LVDS CLOCK
SCPDI SERIAL CONTROL DATA INPUT
SCPDO SERIAL CONTROL DATA OUTPUT
SCPENB SERIAL CONTROL ENABLE
SCPCK SERIAL CONTROL CLOCK
DMD RESETB DMD LOGIC RESET
MBRST(14:0) MIRROR BIAS RESET
MBRST_EXTRA UNUSED MIRROR BIAS RESET
SCR_CLR TEST CLEAR PINS(NORMAL GND)
READOUTA(1:0) A-CHANNEL SERIAL DATA OUT DURING SPAM READ TEST OPERATION
READOUTB(1:0) B-CHANNEL SERIAL DATA OUT DURING SPAM READ TEST OPERATION
TP(2:0) MANUFACTORING TEST POINT(NO CONNECTED DURING NORMAL CPERATION)
RSV_A(4:0)/RSV_B(4:0) RESERVED PINS(NORMAL:GND)
EVCC REFERENCE VOLTAGE DURING SPAM READ TEST OPERATION(NORMAL GND)
VCC2 MIRROR ELECTRODE VOLTAGE(7.3V)
VCC LOGIC SUPPLY
VSS LOGIC GROUND
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) DC220V~410V(typical 300V) is automatically supplied to the ballast.
Check whether the
DC220V~410V(typical 300V)
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 CN105 terminal.
Check whether 5V and 12V are
supplied to the CN105 terminal.
＊
12V must be supplied to operate the
motor.
3
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.)
After the set is powered on, check
whether 5V is detected on pin
No.49 of IC101.
→
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 CN109 on the DMD board is high (5V).
Check whether CN109 #2 signal is
5V.
＊
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 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 DDP1010 IC RESET is normal.
If the voltage between R254 and
R255 is 3V, it is normal.