Acer Aspire 4752 JE40 HR MB 10267 -4 no power on problem i have to faced 5v and 3v not present in power coils pl4102,pl4101....and have short in 5v coil so i did trace the path in 5v section that 5v goes to ram ic's and ram coil pl4601 is dead shirt so i have to change the ram ic tps51116 now board is power on but no display
its Acer 4752 no power on power ic's rt8223mgqw-gp-u1
you should 3.3v_aux pin no 8 and 5v_aux pin no 17, and u have check that enable signal on pin no 18 is present 3.3v is k or not?? is ok enable voltage ??? but not present 3.3v/5v coil??? u should change the capacitor now power on is k otherwise u change power ic'c if u don't have any external shorts...
Acer Aspir 4752 je40 hr mb 10267-4 no power on problem this laptop already attended in local service center by not ready(n/r) battery connector getting 3v is presented and power coil 3.3v and 5vs are not coming but 3.3v coil is getting 0.26v and I find out the short in 5v_aux line then I have to trace the path and finally ram ic tps51116 is short I find out that ram coil 1.5v so replaced that ic but not get the voltage in power coil so then change power capacitors poth are now power on k but no display its take 0.67ampier on dc voltage regulator I would confused already local guys removed bios chip 4mb so I installed with programed one 4mb cfeon chip but same condition……
its Acer 4752 no power on power ic's rt8223mgqw-gp-u1
you should 3.3v_aux pin no 8 and 5v_aux pin no 17, and u have check that enable signal on pin no 18 is present 3.3v is k or not?? is ok enable voltage ??? but not present 3.3v/5v coil??? u should change the capacitor now power on is k otherwise u change power ic'c if u don't have any external shorts...
Acer Aspir 4752 je40 hr mb 10267-4 no power on problem this laptop already attended in local service center by not ready(n/r) battery connector getting 3v is presented and power coil 3.3v and 5vs are not coming but 3.3v coil is getting 0.26v and I find out the short in 5v_aux line then I have to trace the path and finally ram ic tps51116 is short I find out that ram coil 1.5v so replaced that ic but not get the voltage in power coil so then change power capacitors poth are now power on k but no display its take 0.67ampier on dc voltage regulator I would confused already local guys removed bios chip 4mb so I installed with programed one 4mb cfeon chip but same condition……
I also traced in vrm section fully
pin no 22-vdd 5v_s5,
pin no 23-vin 19v,
pin no 31-vddp 5v_s5,
pin no 7-vr_on 3v,
pin no 8-pgood 3v,
pin no 4-sda is 1v,
pin no 6-sclk 1v,
All voltage are k fine
Vcc_core voltage in cpu core voltage is k but gpu core
voltage not present finally I have to change winbond 25q32bvsig programed chip I got the display I
would happy to says that thank u
No comments:
Post a Comment