Re: Dell Precision 7510 charge battery and left side board problem.
Easiest way in my opinion would be to just unsolder it and check both sides. Taking uz26 as example, measure resistance on pin 1,2 to ground then 13,14 to ground.
Re: Dell Precision 7510 charge battery and left side board problem.
Had an almost similar issue a while back. In my case it was a dead Core voltage controller and a USB protection IC. Try removing PU1100 and see if that changes anything.
Last resort would be to inject voltage on the 20Ohm line. Although not much current would flow, at 5V about 250mA to be expected. Might not be enough to get hot but something might get warm.
Re: Dell Precision 7510 charge battery and left side board problem.
By all pins you mean +5V_ALW, correct? Does both side of PJP102/3 still show same value or are they different now (pin1 is one value and pin 2 is different).
Still low but 85 is better than 20, so atleast that's some progress. Try checking different IC connected to +5V_ALW. Stuff like PU200, PU1200, PU1201, PU1400, PU1401, PU1402, PU1600, PU1700, etc.
Try resoldering everything back except PU1100 and see if its still 85Ohm. Then try removing the above mentioned IC and check if resistance increases(unless someone can provide a better approach). If you have a similar donor board, check what the resistance should be or maybe check the forum if someone with a recent post has a similar model and if they can provide the resistance value.
Just as a precaution, check if there is no solder bridge remaining after you disoldered pjp102/3.
Dont inject voltage if the driver chips are desoldered, at 85ohms (injecting 5V max) not much would happen anyway.
Well, since removing pu1100 (vcore related) changed resistance from 20 to 85 I'd suggest starting around vcc core chip first (pu1200, etc)
Okay, so i solder back everything (except PU1100) and cleaned up very well the jumper pins.
Now i have 80Ω on upper pins of both jumpers, bottom pins (the ones that are connected to PL102) have very high resistance.
Sure, try and see what happens. If no change, resolder all ICs and replace PU1100 with a known good chip and recheck resistance value. Around 120-170 Ohm should be OK for that rail.
Sure, try and see what happens. If no change, resolder all ICs and replace PU1100 with a known good chip and recheck resistance value. Around 120-170 Ohm should be OK for that rail.
Hello!
Removed all PU1200, 1201 & 1202 but resistance still stuck at 97Ω.
What do you suggest next?
Re: Dell Precision 7510 charge battery and left side board problem.
Resolder everything back except those that caused resistance to increase when removed. I would replace those, especially PU1100.
Once you have resoldered and replaced necessary parts, measure resistance again. Then resolder the PJP jumpers. If it is still within 90ish ohms, try to power on and see what happens.
Comment