acer d270 3v_alws become 6.70v

[HarryPK]

i have an acer d270 5v_alws is oke but 3v_alws become 6.70v. any advanced is very apricieted....

[ktmmotocross]

Re: acer d270 3v_alws become 6.70v

check fb resistors on ic

[HarryPK]

Re: acer d270 3v_alws become 6.70v

thanks for reply. i cheked pr 183 6.8K and pr 184 9.9K out from board

[HarryPK]

Re: acer d270 3v_alws become 6.70v

is that oke? on page 30

[atsio]

Re: acer d270 3v_alws become 6.70v

Probably faulty fets (PQ13, PQ17) but better replace and PU3

[HarryPK]

Re: acer d270 3v_alws become 6.70v

i have changed with another resistor from other board. it is become 5.5v.

[HarryPK]

Re: acer d270 3v_alws become 6.70v

and changed pq13,pq17. become short 3v alws on somewhere.

[HarryPK]

Re: acer d270 3v_alws become 6.70v

i' m sorry set wrong polarity of pq13..

[HarryPK]

Re: acer d270 3v_alws become 6.70v

setting pq13 and pq17. 3v alws become 2.3v and 5v alws become 0 v. my b PU3 has dead.

[polytek]

Re: acer d270 3v_alws become 6.70v

check pc43 and pr78 and pc42 pr76 just remove pu3 ,pl4, pl3 and compare value on the board.

[HarryPK]

Re: acer d270 3v_alws become 6.70v

pc 43 = 105mf
pr 78 = 1.4 ohm
pc 42 = 108mf
pr 76 = 1.4 ohm
pu3 an pl4,pl3 take out from board

[polytek]

Re: acer d270 3v_alws become 6.70v

values seem good, you need new pu3 Rt8223M, 4 mosfet pq13,pq14 pq17;pq21
and the 2 cap:pc46, pc58 (220uf/6.3V)

[HarryPK]

Re: acer d270 3v_alws become 6.70v

i have changed pu3 5and 3v alwys has come. but still cannot power on. missing 3,3v on power switch button and no light at all

[HarryPK]

Re: acer d270 3v_alws become 6.70v

changed ec kbc. same result. bios pin
pin 1 = 0.50
pin 2 = 0
pin 3 = 3.3
pin 4 = 0
pin 5 = 0
pin 6 = 0
pin 7 =3.3
pin 8 = 3.3

[polytek]

Re: acer d270 3v_alws become 6.70v

is the 5VPCU exist ? if not, CHECK PIN 17 OF PU3 if you find 5V the problem is related to other componenet not pu3, if there is no 5V on pin 17 the problem is pc49 or pu3;
good luck friend

[HarryPK]

Re: acer d270 3v_alws become 6.70v

after changed pu3. 5vpcu available on pl3 and 3vpcu exist on pl4

[HarryPK]

Re: acer d270 3v_alws become 6.70v

but 3.3v un exist on power button pin

[ktmmotocross]

Re: acer d270 3v_alws become 6.70v

i am not amazing about that. 3,3v have many ics and with your 6,7V many of them goes to hell

[HarryPK]

Re: acer d270 3v_alws become 6.70v

any idea?

[mosttafaabdo]

Re: acer d270 3v_alws become 6.70v

any idea?

cheek your I/O