Daewoo DTQ-14U1FS/20U1FS, DTQ-14V1FC/20V1FC, DTQ-14V6NB/14V6NP, DTQ-14V1FS/20V1FS No Picture, Micom

TROUBLESHOOTING GUIDE

2. NO PICTURE

Check the waveform of I101 #46

NG : GO to the figure c

OK : Go the figure d

c	Check
the voltages
33V		5V
		U102			IF OUT	SF101
	TUNER					SAW FILTER
T-DATA			T-CLOCK
					Check
					clock/data signal				Check
	#29		#30			#5	#6
									IF AGC voltage
				#14	AFT	#10		#3
		I701				#8		#4
					Check				Check
	MICOM						I101
					IF Vcc (5V)				RF AGC voltage
				#27 SDA		#11
				#28	SCL			#46
#10		#11				#12			Z501
				#12
XC701					Check			#44	4.5M Trap
32.768KHz
			ST-BY
					clock/data signal
				5V
Check								Check
the crystal
								the waveform
d			Check
	composite video
Z501				#44			Check
						CHROMA/VER Vcc(5V)
		C525
				#18	#43
							Check
Check					#25	HOR/BUS Vcc(5V)
RBG Vcc (9V)
				#19	I101				Check
Check									200V LINE
				#20
RBG signal output				#21					D405
				#13			T402
Check							FBT		R412
ABL current									Check
									heater voltage
									21V
									-3V
					22