Screen failure...

[Sylvia Else]

<https://www.dropbox.com/s/ukoaha26mvek740/IMG_20201105_130842242.jpg?dl=0>

Clearly, this is a backlight problem.

What I find odd about it, is that just turning the screen off and on
again will fix the problem for a while.

I opened it up. As far as I can see, there isn\'t a separate connection
for each light source, and anyway, thumping the device as hard as I dare
doesn\'t make any difference.

There also doesn\'t appear to be a separate a inverter (would have
surprised me if there had been).

Probably headed for the tip, but any thoughts?

Sylvia.

 

[legg]

On Sat, 7 Nov 2020 19:14:44 +1100, Sylvia Else <sylvia@email.invalid>
wrote:

https://www.dropbox.com/s/ukoaha26mvek740/IMG_20201105_130842242.jpg?dl=0

Clearly, this is a backlight problem.

What I find odd about it, is that just turning the screen off and on
again will fix the problem for a while.

I opened it up. As far as I can see, there isn\'t a separate connection
for each light source, and anyway, thumping the device as hard as I dare
doesn\'t make any difference.

There also doesn\'t appear to be a separate a inverter (would have
surprised me if there had been).

Probably headed for the tip, but any thoughts?

Sylvia.

Intermittent open circuit in a series section. Likely visible at the
board level - or measurable with diode test across individual emitter
pads.

RL