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2. If the LCD lights up using normal pressure, then the actual button hardware is ne and any issues you may
be having are not related to button failure. However, if you need to press multiple times, or with force, then
the tactile button dome is failing and should be replaced. Press the Glow button to turn off the LCD and test
the next button and so on and so forth. Each button can be tested the same way until you hit one of the Ac-
tivity buttons that surround the LCD, since, pressing one of these will actually start an Activity. But, once the
Activity has started, each of the buttons that surround the LCD can be tested the same way (again, even if
there is no command associated with a particular button).
Harmony One
The Harmony One uses tactile button domes; small, convex metallic discs that, when pressed down, make
contact with the corresponding pad on the PCB. These discs can deform with time or develop microscopic pit-
ting and corrosion and, most often, these tactile domes require replacement as cleaning the underside of the
dome and pad on the PCB is not effective. Each button should respond with a light touch. If you need to use
even slightly more pressure to activate a button (we call this ‘lazy’), it is usually a good idea to replace it. This
is the procedure:
1. Place the remote down on a at surface and, without starting any Activity, allow the LCD to go to ‘sleep’
(turn off). Now, without jostling the remote, so as not to disturb the tilt-sensor (motion sensor), press down
on any button that you suspect is not working.
2. If the LCD lights up using normal pressure, then the actual button hardware is ne and any issues you may
be having are not related to button failure. However, if you need to press multiple times, or with force, then
there is something wrong with the actual button and/or contact surface. You can test every button exactly
the same way and it does not matter if the button is mapped for use or not.
3. If none of the hard-buttons are working, but the touch screen buttons are working, this is usually due to a
failure in the button controller IC and replacement of the logic board is usually required. However, some-
times this symptom can be caused by a partially stuck button or a glitch in the rmware. So, rst check for
these possibilities. To test for a partially stuck button, massage each button to ensure that it has the cor-
rect travel and does not feel like it is partially depressed. Press each button rmly and see if there is any
difference in travel. Often, buttons near the bottom of the remote, where the front cover begins to narrow,
can become partially stuck. If all the buttons feel like they are moving correctly, then it’s time to check for a
power or rmware glitch. Try doing a battery-pull, wait 30 seconds and re-install. If the buttons are still not
working, then try re-applying the Firmware using the Harmony Software. If there is still no change in behav-
ior, the logic board generally needs to be replaced.
Harmony 900
The Harmony 900 uses tactile button domes; small, convex metallic discs that, when pressed down, make con-
tact with the corresponding pad on the PCB. These discs can deform with time or develop microscopic pitting
and corrosion and, most often, these tactile domes require replacement as cleaning the underside of the dome
and pad on the PCB is not effective. Each button should respond with a light touch. If you need to use even
slightly more pressure to activate a button (we call this ‘lazy’), it is usually a good idea to replace it. This is the
procedure:
1. Place the remote down on a at surface and, without starting any Activity, allow the LCD to go to ‘sleep’
(turn off). Now, without jostling the remote, so as not to disturb the tilt-sensor (motion sensor), press down
on any button that you suspect is not working. This should be done in a slightly darkened room, as you will
need to watch if the keypad backlight goes on. Note that with the Harmony 900, the LCD will only go on if
certain buttons are pressed, so the LCD cannot be used for this testing.
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