(No.YA712<Rev.002>)1-19
5.2
Video Signal Section
No
Is the "L" pulse sent out Pin(1) terminal of remote
control receiver (RS102) when the infrared remote
control is activated?
Check the line between Pin(1) terminal of remote
control receiver(RS102) and Pin(25) of CN301,
and service it if defective.
Yes
Is the "L" pulse supplied to Pin(25) of CN301?
Yes
Is 3.3V voltage supplied to Pin(2) terminal of the
remote control receiver (RS102)?
No
FLOW CHART NO.2
Operation is possible from the remote control unit.
Check AL+3.3V line and service it if defective.
No
Replace the remote control receiver(RS102)
or the remote control unit.
Yes
Replace Digital Main PWB Unit.
When pressing each switches (SW101A, SW103A~
SW107A) do the voltage of Pin(29) of CN302 and
Pin(2) of CN303 increase?
Yes
The key operation is not functioning.
FLOW CHART NO.1
Are the contact point and installation state of the key
switches (SW101A, SW103A~SW107A) normal?
Re-install the switches (SW101A, SW103A~SW107A)
correctly or replace the poor switch.
Check the switches (SW101A, SW103A~SW107A)
and their periphery, and service it if defective.
Yes
Replace Digital Main PWB Unit.
No
No
No operation is possible from the remote control unit.
Picture does not appear normally.(Video input)
FLOW CHART NO.3
Are the video signal inputted to Pin(4) of CN302?
Yes
Check the line between Pin(4) of CN302 and
JK752, and service it if defective.
No
Replace Digital Main PWB Unit or LCD Module
Assembly.
