Thanks @jkyoho
Checked measurements on this post against my board and mine doesn’t match, assuming 8316 IC not on right
On my board with Ram issue, the black component with he arrow pointing to it is OL both sides and gets 175k resistance to ground on both sides and diode reading of 540. on this board I get 5ohms resistance to ground and diode reading of 0v.
Also my other readings dont match the post by @jkyoho so it does look like I did not do a good job on the 8316 IC. Its a bugger as that is the 4th time I have tried that IC. Got 5 new pre-balled ones from RS Components and have 1 left. Was sure it was on right this time unless there could be something else causing them to blow each time? Would be nice to think I got it on right at least one time 
Going to take it off again and recheck readings without it to see if they are back to normal before trying to put my last one back on
I haven’t checked, but that sounds about right, the black component is an inductor btw
Yeah, that’s no good, I’d pull the IC and see if that 5 ohm short to ground disappears
Ahh I didn’t realise you’d went through so many of them, I would verify the resistance to ground on the +/- 5V outputs at the 8316 IC when the chip is removed and also measure directly across those two diodes (using the nearest neighbour components/pads) in resistance to determine if they are shorted, while it’s possible a shorted diode could blow the 8316 IC it’s not actually that common but worth checking. The other possibility is bridges at the LCD connector pins/joints, I think you said you already verified this but worth double checking too
Most important thing is checking those above measurements prior to attaching battery/power to the board when you’ve put the replacment on, the chip won’t blow if you don’t power it up 
@Severence Sound advice thank you, will give this all a go tonight if I get chance, if not tomorrow and report back, thanks again for all the replies, will not let this switch beat me lol. Only doing it for the fun and to see if I can, while improving my soldering and diagnosis skills so wouldn’t be a challenge if it was easy 
So took the IC off and get OL on most readings but assume that’s because the chip links the components and without it there is not path??
Resistance to ground on the +5v is 90kohm and -5v is 0.3kohm but that may be right as it links straight to ground if I’m not mistaken.
I am getting a normal reading now on the inductor but low diode reading of 0.134v drop on the +5v diode and OL both ways on the -5v diode - it doesn’t look very good. Resistance over the +5v one way is 6.5kom, the other way is 1.8kohm, the -5v diode is 295kohm both ways. Do you know what diodes these are or can be replaced with?
Seems a little high in one orientation, I measure approx 480 ohm across this in one polarity (though worth noting that the bare die versions of this diode which your board doesn’t use measure approx 4K in one polarity) and an effective fluctuating open in the other, perhaps meter differences at play here… what diode mode reading do you get across this diode in both polarities?
This diode has blown open by the sounds of it
I don’t tbh I usually just pull them off donors usually
Unfortunately I don’t have any I can use but looking at the datasheet below it says 30v 1a
And looking on RS I found a few but the first one looks promising, what do you think?
Its size is 1.25mm x 2.5mm which sounds about right I think?
Here’s the ones listed in the datasheet example circuit
https://www.mouser.co.uk/ProductDetail/ROHM-Semiconductor/RSX101VA-30TR?qs=4kLU8WoGk0tB41wg4aRbGQ==
I’d verify the size of the diode package with some calipers though first just to be sure.
Provided the specifications are a close match, will be fine as a replacement, though I don’t imagine either of these rails draw anywhere near 1A max, you could probably go lower if you wanted worst case
yeah saw that but down as not recommended anymore and not in stock, the alternative that is recommended is RSX101VAM30 but that is slightly larger than the one I found and the shipping costs are too much compared to the part price and size. Do you thing the ones on RS look ok for the purpose?
Yeah wil be fine provided the size is correct
Suppose if you wanna do a mouser order and get the order price up for the free shipping then here are some things I’d pick up
a roll of 63/37 Chipquik solder
If your planning on continuing to work on Switch boards, grab some fuel gauages
some more 8316 IC’s just incase
your diodes
That should bring your order up to about the limit if you wanna go the Mouser route
Hi @Severence
Changed the bad diode and now the readings all seem within tolerance with my meter.
Booting into RCM works and can send payload, backlight then comes on but no display on the screen.
I get +5v but only -680ma on the negative line.
Do you think the IC is still not on right, something else to check, or could it be the LCD connector. It looks ok but cant tell for sure.
Thanks
That’s good, likely means the chip hasn’t blown up this time
Can you clarify, do you mean volts? as if you mean mA and you have your meter in the current/amps mode you’d effectively be shorting it out measuring in this fashion
if you mean volts, disconnect batter/power and make sure the negative rail diode isn’t open again, and if it isn’t make sure it’s on the right way round, after this has been verified, check to see if your getting your 1.8V enable present for the -5V rail (there is two of them)
Sorry, meant -680mv
Getting 1.8v on both the 2 leftmost pads to the IC
on the diode i get .14 one way and 1.5 the other which matches my boards that displays but has a ram issue. Assuming as one side is tied to ground from the coil?
I’d just doubly make sure that diode is on the right way round just incase
That’s good
Seems about right off the top of my head, what’s the resistance to ground on the -5V output in both polarities?
Yes effectively
Can you also let me know the voltage at the cap coming off C2 from my previous image?
pretty sure the diode is on the right way, also checked data sheet before soldering it on to ensure it matches the diode image orientation on the board
Resistance with black on ground = 3kohm / red on ground doesn’t give a proper reading, flashed OL then I just get a moving dot on the screen as if its trying to get the reading but stays like that
Which is cap C2, couldn’t see a previous image?
it’s the one cap in that row of resistors going to pad C2 of the IC (brown)
I’d cross compare this with your other board noting which reading relative to which polarity, I get significantly different readings on my board
C2 = 180kohms on other board, OL on this one
Resistance on other board to -5V black on ground = 36kohm red on ground fluctuates above 100kohms
just checked C2 again under the microscope and it fluctuates between 30k and 80k but cannot settle on a reading
Can you provide the voltage please
Sorry, anything from 2mv to 300mv fluctuating