acer one d270 dead

[Romulo]

Re: acer one d270 dead

anyone please help on this

[raajkumar]

Re: acer one d270 dead

thanks for the response raajkumar i already done inject 1v on shorted side of pr133 now pl7 and pl8 getting hot should the two the culprit?

No PL7 and PL8 was the coils. No need to replace it. Did you checked PQ1 and PQ50 for short, if it's not short circuited first you remove pl8 only. and inject power through PR133 and increase the power to 3 to 5V and see what happening. I think PU2 may be shorted. But can't be sure.

[Romulo]

Re: acer one d270 dead

i remove PL8.there is no short on PQ1 and PQ50 i inject again 5v and now PU8 is getting hot

[raajkumar]

Re: acer one d270 dead

Check pq4, PQ3, PQ2, PQ5 for short. if its not shorted you can replace PU8.

[Romulo]

Re: acer one d270 dead

pq5 s to d 76ohms pq2 fluctuating reading pq3 104ohms pq5 126ohms now i rechecked pq1 and pq50 now it becomes fluctuating reading

[raajkumar]

Re: acer one d270 dead

Did you removed them and checked. sometimes it will show the circuit connectivity.

[Romulo]

Re: acer one d270 dead

no i checked in the board ok thanks ill try to remove them and checked again

[ganiboy76]

Re: acer one d270 dead

@ romulo we have same problem now that im working on acer d270 netbook. so there no point for me to start a new thread...shorted on main power rail Vin..im starting to check capacitor that are connected directly to Vin and ground PQ38 is getting hot..

[ganiboy76]

Re: acer one d270 dead

update: when i remove the PL6 pq38 not getting hot but if a replace pl6 and put it back the same issue pq38 goes hot what could it be the culprit for this?please anyone help

because.. PL6 is the main b+ of the charger. concentrate on all capacitors first that are connected to the main power rail.. Vin.. then mosfets

[ganiboy76]

Re: acer one d270 dead

there are lots of capacitors FROM 0.1 4.7 and 2200. ..connected from main power rail to ground connected from PR 133 main power rail.. usually that two capacitors besides two mosfet..as per BoardView..

[ganiboy76]

Re: acer one d270 dead

lets check together @Romulo these capacitors and mosfets.. as they are connected to main Vin..

[aprilbg087]

Re: acer one d270 dead

Specs are very similar so it should be OK.

sir how can i open this free node site, user name and password

[dellxps15]

Re: acer one d270 dead

u are making some confusion on approacing a short on 19v rail. if u look on schematic, u see that first thing u removed is pl6 but it's not a a capacitor.

look schematic on page 29. if pq38 is getting hot u have short on 19 v rail. remove pr133 and see if u still have short... if short is pq38 side then u need to focus on taht zone, otherwise is some component that get that 19volt to generate something else.

now take bench power supply, solder a wire to the side that has short and get positive on that side and gnd on some metal part. start with 3 volt and see if psu get red light... meanwhile see if some component is getting hot..... and monitor ampere and voltage... for a short u neeed around 10 watt of power consumption so like 4 ampere and 2.5volt

if wire get hot but nothing on the board increase a bit voltage till max 4 volt and see if some zone is getting hot. after about 45-60 seconds from the time u started inject volt on mainboard , power off psu bench and touch mainboard for some hot zone... then power psu again and focus on that zone.... till u go further and further... when u fing some capacitor or similar, uve found the short.

most common all component that get Vin as input voltage could be the shorted one, like for example pu3 (3.3 and 5 volt regulator)