iFixit has completed the Apple Watch series 4 teardown. While it may look like other
series, its internals have had a major
shakeup for the better. It gets a 6-out-of-10 for repairability.
Apple watch series 4 teardown reveals a much more orderly build not plagued with masses of uber-sticky glue. All that is needed is a heat opener and scalpel to remove the glass and pentalobe screwdriver and tweezer to access the insides. Once in battery replacement is easy.
iFixit says the first Apple Watch was revolutionary, but Apple has
put some serious design thought into series 4. “A device that knows its priorities
and wants to look elegant inside and out.”
Apple Watch series 4 screen
It comes in 40mm and 44mm sizes (Watch 3 is 38/42mm) and
uses a new LPTO OLED screen patented by Apple. It is 5-10% more power efficient
for the same 1000 nit maximum brightness. The larger display is 759/977 sq mm
against Watch 3 of 563/740sq mm.
Significantly better is the dual-core S4 processor going
64-bit for the first time and 16GB storage. Apple claims it is 100% faster than
the S3 using similar power. The W3 wireless chip is Wi-Fi N 2.4GHz now supports
The Apple Watch series 4 includes an ECG. It is a LEAD 1
style that measures the voltage between
the right and left arms. The first electrode is on the Watch back. The second
is the crown, held by your opposite hand’s fingers. Apple’s software is the key
to making sense of the reading. It is no substitute for a proper medical ED+CG
but can detect atrial fibrillation.
The accelerometer/gyroscope has been beefed up to include a
fall sensing capability. Again, the software
takes this information and allows a user to say they are OK, or it sends an
Gone is a ceramic case – its either aluminium or stainless
steel. The front and back are a mix of sapphire glass and ceramic. It still has
about an 18-hour maximum battery life, is waterproof to 50 metres and uses the same bands as Watch 3.