Electro help: SAMSUNG HLP - 4663WX - POWER BOARD CONNECTOR PIN VOLTAGES

Saturday, March 02, 2013

SAMSUNG HLP - 4663WX - POWER BOARD CONNECTOR PIN VOLTAGES - LIGHT ENGINE FAILURE INSPECTION

TROUBLESHOOTING

DESCRIPTION	KEY POINT	REMARK
1) When the power cord is plugged in, 2) DC 380V is automatically supplied to the ballast.	Check whether the DC380V power is supplied to the ballast.
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.	Check whether 5V and 12V are supplied to the CN105 terminal.	12V must be supplied to operate the motor. (The voltage of the motor driving power is 12V.)
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. à After a while, the sound generated by the rotating color wheel is heard.	If 5V is not detected, the motor will not operate.
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 voltage is 5V. # When about 4 seconds have passed after changing to pulse waveform, the screens are displayed on the set.
1) Method for checking whether the DDP1010 IC RESET is normal.	If the voltage between R254 and R255 is 3V, it is normal.