Electronics > Repair
Phone backlight puzzle
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amyk:

--- Quote from: PlainName on December 12, 2024, 11:02:33 am ---
--- Quote ---If the backlight driver IC is on the panel itself, it could be incompatible with the original one
--- End quote ---

Oh, there's a thought. But I would assume it would be OK even if not original else they wouldn't be able to sell these things. Well, they could sell them but they'd have an awful lot of returns!

--- End quote ---
Perhaps there's a difference that earlier (or later) versions of the software were sensitive to.

The FTDI fiasco should've taught everyone that compatible, doesn't always mean 100% compatible.

I haven't researched the details but it might be possible to get the replacement to work with a software change.
PlainName:
I think a software change  is probably beyond me, if for no other reason than I want to keep this particular version. I have another one of these (white gold case, yuk) but that runs LineageOS and suffers for it (although LOS itself is great and in other circumstances would be fine). This particular phone is still running the latest official release, which I rather like.

Yeah, I know this sounds a bit picky but that's the nature of this project - it is mostly an emotional thing. Looked at dispassionately it makes no sense since the phone is crap for nowadays. For instance, WiFi runs down the battery super quickly now all the access points are WiFi6 (no idea what that's about, but worked around with a util to disable WiFi when the phone isn't being used). But there are good things too, like Google Messages actually being usable, not having RCS crap and allowing more than 5 characters on input before a line feed. So, unfortunately, even if it did turn out that a software change would fix it I'm not sure it would be worth doing  :-//
PlainName:
To round this off...

Went to the Aliexpress supplier, who have a shop and do their own customer service, and explained the issue.  They said they can either give a partial refund or have it returned, and although I tried to explain I wasn't after either and just wanted to understand how it couldn't work but still power on OK, we resolved it by doing a free return and re-ordering. However, I ordered from a different supplier who was shipping what looked like the same thing (same product photos and packaging).

That arrived yesterday and isn't the same: no cardboard box or battery sticky pads, for instance. But otherwise looked fine so I gave it a go and it works perfectly.

Wish I'd done a partial refund instead of free return now, then I could've tried to figure out the problem with the other screen. But knowing my luck I'd break something else when trying stuff so it's probably for the best  :)
u666sa:
Bingo! It's a hit or miss with these things. We don't get our stuff from ali, we get it from local suppliers, parts shipped by couriers same or next day. We can return stuff for credit in the store. However, it's the time wasted. Plus you get angry customer, where is my phone it should have been done yesterday, give it back to me. So often you end up with time spend, no money, and time lost to credit in the store.

In other words, these phones are time wasters.

We just don't do them.
PlainName:
Yes, I appreciate that for a professional repairer, and I accept that my time on this is worth less than the £10 the replacement cost. What was bugging me was not understanding how the fault could occur: the backlight worked, the LCD worked, the PCBs were OK and when powered on it was good. But moving past the boot code the backlight was dead.
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