820-3437-b no chime no image

MegaObi

Member
Hey guys. This one has no chime no boot. doesn't seem to have any liquid. all the voltages I have measured look good as I was probing around I found r7630 is at 6.2v seems a bit crazy! I measured and from u7600 pin 15 there is 6.2v on p1v0s0_vbst & p1v05s0_boot_rc

There is fan spin
light on charger is present
also activity on usb is present

anyways voltages;
ppbus_g3h 8.63v
pp3v42 3.46v
ppvrtc 3.34v
pp5v_s0 5.1v
pp3v3_s0 3.3v
pp3v3_sus 3.3v
pp1v8_s3 1.79v
pp1v2_s3 1.2v
pp1v05_s0 1.05v
pp1v05_sus 1.05v
pp1v5_s0 1.5v
pp0v6_s0_ddrvtt 0.6v
pp1v05_s0 1.05v
ppvcc_s0_cpu 1.762v

smc_lid 3.4v
smc_onoff_l 3.4v
smc_adapter_en 3.42v
pm_slp_sus 3.3v
pm_slp_s4_l 3.3v
pm_sysrst_l 3.3v
pm_pch_pwrok 3.4v
pm_pch_syspwrok 3.45v
pm_rsmrst_l 3.3v
pm_sysrst_l 3.3v
pm_batlow_l 3.3v
pm_pwrbtn_l 3.4v
put_reset_L 3.3v

not sure what else.
 

2informaticos

Administrator
Staff member
"I found r7630 is at 6.2v seems a bit crazy! I measured and from u7600 pin 15 there is 6.2v on p1v0s0_vbst & p1v05s0_boot_rc"
Not crazy at all, just correct...

"also activity on usb is present"
Can you confirm with pendrive OSX with LED Link?
If yes, try PRAM reset.
Then post voltage for J8300, pins 2/3, 14, 15, 16, 18/19.
Check if you get voltage at least in the first seconds.
Test external video too.

You can also try new BIOS.
 

MegaObi

Member
usb activity i usually just plug in usb mouse see if laser turn on...

but i also try with osx usb drive and flashing!
i also try pram.

i think u mean pin 3/4 because pin 2 no connect?

anyways
3 25.35
4 25.36
14 2.6
15 3.2
16 3.2
18 3.3
19 3.3

in first few seconds no voltage. i will test external after lunch thanks
 
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