My office VOIP phone Linksys SPA942 died a few minutes ago. The symptoms are as stated in the title:
- the screen flashes very shortly, goes blank about 1 second and repeats the same
- I can hear a clicking sound in the handset in the same pattern
I have measured the voltage on the adapter and it is as stated on the adapter: 5.2V. The adapter is labeled: INPUT: 100-240V~, 50-60Hz, 0.35A OUTPUT: 5.0V 2A.
I have opened the phone up and disconnected everything I could: handset, screen, speaker, case and the voltage all over the motherboard varies at the same rate as the screen flashes: from about 0.5V to about 1.9V. I cannot find 5V anywhere on the motherboard.
Everything on the motherboard looks absolutely pristine under visual inspection.
I don't have a replacement adapter to test if the adapter is failing under load.
My guess is the obvious:
#1 adapter is failing under load OR
#2 motherboard is going into some sort of a boot loop.
What would be the easiest way to figure out if it is actually the phone that is dead?
- the screen flashes very shortly, goes blank about 1 second and repeats the same
- I can hear a clicking sound in the handset in the same pattern
I have measured the voltage on the adapter and it is as stated on the adapter: 5.2V. The adapter is labeled: INPUT: 100-240V~, 50-60Hz, 0.35A OUTPUT: 5.0V 2A.
I have opened the phone up and disconnected everything I could: handset, screen, speaker, case and the voltage all over the motherboard varies at the same rate as the screen flashes: from about 0.5V to about 1.9V. I cannot find 5V anywhere on the motherboard.
Everything on the motherboard looks absolutely pristine under visual inspection.
I don't have a replacement adapter to test if the adapter is failing under load.
My guess is the obvious:
#1 adapter is failing under load OR
#2 motherboard is going into some sort of a boot loop.
What would be the easiest way to figure out if it is actually the phone that is dead?
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