Hey guys,

I need some help on this board.. This board when i push the start button turn on and off in 1 sec and start booting!!

When i remove the PAD6404 and PAD6400 the board start normally.. But i don't get the +VTT !! i already replace a Processor, PCH, U6400 (TPS51218DSCR).. And no changes..

Anyone have one problem like that??

Thank you

hi there Porto, you must to chek +VBAT for short on ground
and also try to change
Q6001 FDMC8884
Q6002 AM4410NC
Q6005 AM4825P_AP
it's tipical
also analogs of parts is:
FDMC8884: AON7408L
AM4410NC: DMN3030LSS
AM4825P_AP: AO4455.

Thank for your reply recordista!!

i check + VBAT in diode mode and i have 450v!! i already replace q6001 and q6002 and same issue!! But the board without q6001 and q6002 start's well and don't go off!!

could be U6603 (TPS51621RHAR) ??

wow 1st time i see this voltage level.
TPS51621RHAR yeap will try because this one control battery rail.
after change this controller try do not on buttery for shure... if it's ok try to pull on battery inside

yes if you put the multimeter digital in Diode Mode the unit is (V).

This board make me upset!!!

new balance:

i already replace a TPS5621 and same issue! i have other same board working and i change all Q6600,Q6601,Q6602,Q6603!

i remove the PAD6600 and measure the Resistance in bought side off PAD6600 and compare with a working board and the measurements are the same...

The board without the PAD6600 start well, when i close the PAD6600 then same issue turn on and off!!

Any more idea???

Thank you for reply

Can't repair this board-.. Thank you Anyway!!