Hitachi 42HDF52A Service Manual page 17

Key pad doesn't work
Key pad doesn't work.
Take off the back cover and check if
the wire of PCB-Speaker connectoer
has been well connected to the
PCB-Key Pad and PCB-Main?
Change PCB-Key Pad and
connect all wires properly.
Change PCB- Speaker
connectoer and connect all
wires properly. Check if it works
Change the PCB-Main.
Yes
Check if it works
No
Yes
No
17
Connect
the wire
properly
Test
again
Yes
No