When The Panel Pba Does Not Operate Normally - Samsung RF28R7201 AA Series Service Manual

TROUBLESHOOTING

4-2-9. When the Panel PBA does not operate normally

① When the entire or a certain section of the Panel PCB does not light up
There is a MICOM embedded in the Panel PCB. So, take care when doing repairs.
And, except the Solder Touch, replace the PCB.
② When the Panel PCB buttons do not work.
※ When it keeps troubling after check with the above procedures.
[Check after turning off the unit and turning it on again.]
Start
MAIN PCB
Connector (CN40) is inserted
normally?
Yes
The Panel
PCB Connecter is connected
properly?
Yes
When replacing
Panel-PCB, it lights up?
No
Check the Wire Cut
and the Wire Short.
Buttons get stuck
being pressed down?
No
Buttons get stuck
being pressed down?
No
Buttons get stuck
being pressed down?
No
Check the Wire Cut
and the Wire Short.
No
Insert MAIN PCB Connector again.
No
Repair the contact trouble.
Yes
Yes
Re-assemble PCB ASS'Y or clear the restriction.
Yes
Re-assemble PCB ASS'Y or clear the restriction.
Yes
90
Insert Connector again
Replace Panel PCB.
Replace Panel PCB.