8-4
A0CF0TR
No
Is the "L" pulse sent out Pin(1) of RS102 (remote control
receiver) when the infrared remote control is activated?
Check the line between Pin(1) of RS102 (remote
control receiver) and Pin(13) of CN403, and service
it if defective.
Yes
Is the "L" pulse supplied to Pin(13) of CN403?
Yes
Is 3.3V voltage supplied to Pin(2) of RS102 (remote
control receiver)?
No
No operation is possible from the remote control unit.
FLOW CHART NO.12
Operation is possible from the unit.
Check AL+3.3V line and service it if defective.
No
Replace the RS102 (remote control receiver) or
remote control unit.
Yes
Replace Digital Main CBA Unit.
Picture does not appear normally. (Video input/S-Video input/Y/Pb/Pr input/RGB input)
Are the video signals outputted to the specific
terminal?
Check the luminance signal line, and service it if
defective.
Check the chrominance signal line, and service it if
defective.
Check the RGB video signal line, and service it if
defective.
Check the composite video signal line, and service it
if defective.
Check the component video(Y/Pb/Pr) signal line,
and service it if defective.
Check the line between each pin of CN401 and
CN404 and input terminal and service it if defective.
No
No
No
No
No
Yes
Are the luminance signals outputted to Pin(27) of
CN401?
Are the chrominance signals outputted to Pin(29)
of CN401?
Are the component video(Y/Pb/Pr) signals outputted
to Pin(4, 6, 8) of CN404?
Are the RGB video signals outputted to Pin(26, 28, 29)
of CN404?
Are the composite video signals outputted to
Pin(2,12,22) of CN404?
Replace Digital Main CBA Unit or LCD Module
Assembly.
FLOW CHART NO.13
When pressing each switches (SW101, SW103-
SW107) do the voltage of Pin(11) on CN403 increase?
Yes
No
FLOW CHART NO.11
Are the contact point and installation state of the key
switches (SW101, SW103-SW107) normal?
Re-install the switches (SW101, SW103-SW107)
correctly or replace the poor switch.
No
Check the switches (SW101, SW103-SW107)
and their periphery, and service it if defective.
Yes
Replace Digital Main CBA Unit.
The key operation is not functioning.
Summary of Contents for LT850-M32 - SERVICE
Page 13: ...4 2 A0CF0DC_rev 2 Rear Cabinet 1 Stand Assembly S 4 S 4 S 2 S 3 S 2 S 2 S 2 S 1 S 5 Fig D1...
Page 36: ...10 4 A0CF0SCP2 Power Supply 2 Schematic Diagram...
Page 37: ...10 5 A0CF0SCP3 Power Supply 3 Schematic Diagram...
Page 39: ...10 7 A0CF0SCF Function IR SENSOR Junction Schematic Diagram...
