Most of the newer acer motherboard's have 3v problem where you get 5V on coil but no 3V on coil even though 3v LDO is present. This is cause of "thermal protect shutdown" circuit. In your case, it is there on pg 38 of schematic. You will find 3V_EN & 3V_EN_R missing(MAINPWON however remains present). The solution with repect to your motherboard is
01.Remove R2626 & R2627
02.Remove D2016
03.Put a jumper between 2 pads of D2016.
Now your dc amp reading should go close up to 0.0020A and there will be 3V on coil.Mb will give display on triggering if there is no other problem.
Tested it on many newer Acer motherboards and this trick works fine. Hope this will help a lot of members here.
Most of the newer acer motherboard's have 3v problem where you get 5V on coil but no 3V on coil even though 3v LDO is present. This is cause of "thermal protect shutdown" circuit. In your case, it is there on pg 38 of schematic. You will find 3V_EN & 3V_EN_R missing(MAINPWON however remains present). The solution with repect to your motherboard is
01.Remove R2626 & R2627
02.Remove D2016
03.Put a jumper between 2 pads of D2016.
Now your dc amp reading should go close up to 0.0020A and there will be 3V on coil.Mb will give display on triggering if there is no other problem.
Tested it on many newer Acer motherboards and this trick works fine. Hope this will help a lot of members here.
I tried it sir but the LED and charging light blinks at the same time the ntaking only 4 milliamps
This case sounds similar to ours for a HP unit we serviced recently.
Originally, every battery we tested would not charge. Then we brought in the very nice stand alone charger tool NLBA1 which confirmed that our replacement battery was deep discharged and was defective. We sent it back to the vendor and after weeks of chats, they replaced the unit with a fresh battery.
The original battery had 800+ charge cycles on it and the NLBA1 was able to charge it without our HP logic board. The logic board could not charge any attached battery.
In the end, thanks to this forum - the issue was that the first mosfet was shorted.
Remove all power. Meter in resistance mode.
Check the usual mosfet readings between SOURCE & DRAIN; GATE & DRAIN; GATE & SOURCE for the first 2 mosfets. PQ302 & PQ303.
If no issue found, you can check PQ305 & PQ306.
Next, with the adapter ON - what are the voltage readings @ +19V_P1 ?
Comment