MikeMac
Battery would charge again after another drop; opened it up, replaced the connector and replaced everything.  Charges fine and screen is great but fades after 10 or so secs power-on.  If you leave it, screen comes back perfectly and then fades - any suggestions?  

Hopoing it's not new screen time because it's a midnight blue and it looks like they are difficult to source.
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Andree27
It is possible that the one chip is hot, you may have damaged another chip ,
Has had a similar experience with other brands phone ...
Only it worked for me for 20 minutes and then ...
Many times it was dropped , i am change the motherboard ...
If you forget thermal paste, then there are similar symptoms ...
(  In your case, it's the paste ) ...

expi.jpg  expi 1.jpg  expi 2.jpg

PS.

    I understand the screen has changed ? is available to get the another lcd for test ? But i don't believe this version ...
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MikeMac
That's really helpful - thanks Andree.  I've not changed the screen - was working perfectly after the drop but just didn't charge because the connector was loose.  I don't have another LCD but given that it's perfect when it switches on and then fades, it could be the thermal silicone (heat...etc).  Worth a try and cheaper than a new screen.
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Andree27
I agreed with you - there should be no problem with the screen ...
I personally think - that it is a cooling problem , overheating protection is running ...
More potential problems which I allow - backlight fuse or display fuse ...
It can be determined visually - damaged diodes and coils , they are usually denoted by the letter V.
If the component is damaged - donors can be ipone an sam sung phone motherboards ...
ex.jpg  ex1.jpg  ex2.jpg 
PS.

I hope you don't get that far , if that doesn't help, let's take a deeper look at the problem ...
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Andree27

Thermal Pads or Thermal Paste

The surface of a CPU or a heat sink is never entirely flat. If you place a heatsink directly on a CPU,
there will be tiny, nearly invisible, gaps between the two. Since air conducts heat poorly, these gaps
have a very negative effect on the heat transfer. Therefore, an interface material with a high thermal
conductivity is needed to fill these gaps to improve heat conductivity between CPU and heatsink.
Here, you can decide between using thermal paste and thermal pads. But when should you use which solution?
What are their differences and what advantages do both solutions have?
colpad1.gif 
Thermal Pads
colpad.jpg 
Thermal pads are a lot easier to install than thermal grease. Unfortunately, they aren’t as effective as a thin layer of thermal paste.
If the gaps are large , must be used termal pads .
Some stock CPU coolers come with pads, because they’re nice and clean, and they’ll work fine.

But they are one-shot solutions only. You have to replace the pad if you ever remove the heatsink from its mounted position, because
the heat of the operating CPU will have caused the thermal pad to conform the top. So, once you move the heatsink there will be new
gaps between the surfaces. So never forget: If you dismount the heatsink, replace the thermal pad and remove all debris.

Avoid Common Mistakes

When using thermal pads or thermal paste, there are some mistakes that are often made. So, here are some ideas to avoid those:
Never use thermal compounds and thermal pads together. Just because you use both, the effect won’t increase. The reverse is true.
Adding thermal grease on top of a thermal pad actually reduces the ability of heat to flow to the heatsink.
Also, never stack several pads on top of each other. Two or three pads on top of each other between the CPU and a heatsink might kill the CPU.
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