Service manual

DV-L70U
8-3
NO
Does a signal come out in the following, each output terminal of the integrated circuit? Picture signal IC2102 12pin Y-SIG. IC2102 8pin C-SIG. IC2102 10pin CVBS-SIG.
NO
NO
Are the video signals inputted to the pins of LCD DECODER IC1801. IC1801 3pin Y-SIG. IC1801 5pin C-SIG.
NO
NO
A disk is set on the tray, and played back. It confirms that there is no problem by flowchart NO.12.
YES
A video signal doesn't come out in the outside
projected image output terminal (J6002).
FLOW CHART NO.13
Check the peripheral circuit of IC1801.
YES
Doesn't the voltage adjustment of the line come off +7.5V? If it deviates, it is readjusted with R1102.
Check the peripheral circuit of IC2102, IC1805, Q2102, D2301.
NO
Check the line between the pin 20 of IC201 and pin 3 of IC1801. (Q203~210, IC2101, Q1801, Q1807, Q1808) Check the line between the pin 22 of IC201 and pin 5 of IC1801. (Q201~208)
NO
Do 19 of IC1801, 21, 24 pin (VR, VG, VB) output appear?
YES
LCD panel peripheral circuit and the existence of the failure place of the appearance are confirmed.
YES
A LCD panel power circuit and rogic circuit are examined. (IC1000, Q1100, T1100, etc.)
Is a power source being supplied to the LCD panel normally? VGH(+13V), VSS(-16V), VCC(-10.9V), VSH(4.8V), VGL(-10V)
YES
NO
COMMON AMP., CURRENT DET. circuit are examined. (Q1102~1103, IC1103, etc.)
YES
COMMON Doesn't AMP. adjustment come off? If it deviates, it is readjusted based on the GPOS adjustment.
Is the COM bias level of the LCD panel normal?
YES
NO
Check the peripheral circuit of IC1101.
Is TFT LCD CONTROL PROCESSOR (IC1101) normal?
YES
The outside output terminal (J6002) peripheral is checked from 12 of IC2102, 8 pin. The VIDEO DRIVER circuit composed of Q2201, Q2206 is examined.
Picture do not operate normally.
FLOW CHART NO.14
Does 13 pin of IC1801 gain the control voltage (about 3.1V) of TINT?
YES
YES
NO
Is the outside horizontal synchronizing of 34 pin of IC1801 normal?
NO
NO
Is (the 14,16 pin of IC1801) doing oscillation (3.58MHz) with VCO of the chroma circuit normally?
YES
NO
NO
NO
NO
Is the voltage of pins 5, 6, 7, and 8 of TP1191 normal?
Is the backlight going on?
YES
YES
Is each voltage of CN1105 normal? Is the oscillation of inverter normal?
NO
Check the pin 49 of IC3200 and pin 9 of IC3201. Replace the inverter unit.
Check the periphery of IC1000, Q1100 and T1100.
Is TFT LCD CONTROL PROCESSOR (IC1101) normal?
YES
LCD panel peripheral circuit and the existence of the failure place of the appearance are confirmed.
Check the periphery of IC1101.
NO
Check the periphery circuit 13 pin of IC1801.
NO
The readjustment of white balance is done.
Check the peripheral circuit 6 pins of IC1801.
Replace the backlight.
Is white balance normal?
YES
NO
Check the chroma periphery circuit of IC1801.
Are 19 of IC1801, 21, 24 pin (VR, VG, VB) output normal?
YES
Check the LCD panel unit.
YES
NO
Check the chroma periphery circuit of IC1801.
Are 19 of IC1801, 21, 24 pin (VR, VG, VB) output normal?
NO
Check the LCD panel unit.
NO
Check the periphery circuit of X1801 and pins 14, 16 of IC1801.
Does 6 pin of IC1801 gain the control voltage (about 3.0V) of COLOR?
YES
No picture
FLOW CHART NO.15
Color of the picture image is abnormal.
FLOW CHART NO.16
A color doesn't have it about the picture image.
FLOW CHART NO.17
Check the pins 38, 44, 43 of IC1101 and L1109, D1105, IC1102, Q1101, etc.