820-2915 no power

aurel476

New member
green light and orange present, no power on from battery and charger

ppbus_g3h 16.60v

pp3v42_g3h 3.42v

smc_reset_l 3,42v

smc_on_off 3,42v

smc_bc_acok 3.31v

good charger and battery know,
 

dukefawks

Administrator
16.6V on PPBUS is a problem. Shorted Q7030 I bet. Replace U7000, Q7030/35 and check resistance between pins 17/18, 27/28.
 

dukefawks

Administrator
Define "short". This line will measure low just after removing power. Do a resistance measurement and make sure the board is fully discharged.
 

aurel476

New member
current draw 2.88A pin 1 with 5V pin 2 0.01A

resistance to gnd pin 1 0 ohm pin 2 15kohms
 
Last edited:

dukefawks

Administrator
Something must be getting warm at 3A and 5V. You are putting 15W into the board! Use the good old lips and go over the board.
 

dukefawks

Administrator
I cannot help you any further, that 15W must be going somewhere. Use thicker wires to the board and measure if the 5V is actually getting to the board and not already dropping somewhere in the PSU and wiring.
 
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