[SOLVED]Running out of FETs

Tony Tone

Member
820-2936 Water damage. Have made lots of progress. PPBUS_G3H is 3.23V.
I don't have my 3.3V rail, but do have PP5V_S5. I notice if I diode mode to ground on L7220-1 I get 0.130. I have changed Q7220 and also changed U7200 a couple times. Once I change I do my diode mode reading and something like 0.300 something that looks more normal. But once I connect power it goes back down to 0.025 or something really low. So I am guessing something else to blame.
My general question is: should I change all of these at once? U7200, Q7220, Q7260, Q7261, & Q7221?
 

Tony Tone

Member
I know I need to go back and check my ISL and current sensing resistors. I did change ISL and resistors were way bad. I need to recheck the second set. I think it was around 3.0Ohms, so I assume they were good.
 

dukefawks

Administrator
Why are you messing with U7200 when PPBUS is not even present? Is PP3V42 even there? If yes then probably still problem in U7000 area.
 

Tony Tone

Member
Fixed. I had a lot of work and lots of other questions. But I have figured them all out. Thank you Duke.
I apologize for being brain dead sometimes. Overworked, fatigued & stress I start to get stupid real fast. Been on this one for 5 days and finally got it : )
But thank you for pointing me in the right direction. Yes, it makes a lot of sense now. So my dumb question actually bared more fruit than I thought! Thank you again!
 
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