rare AT6 dv600 board lots of issues , remaining a last one :P

[highpulse]

well this board entered the store yesterday , just today i had time to open it , symptom not turning on or charging bat . opened it and visually nothing seems burned . so start main test , were 19 volts goes . max until source of pq52 , and pin1 of system charger . ok , injected 19 volts with source lab to see if i found a short after that PQ52 , but nothing . all seems fine , started t chek coil to GND found te 5 volts line shorted , PC111 was dead , replaced it , 5 volts line no more n short . since i chekd that the gate of PQ52 was still 19 volts , simply there was no ACOK signal to the gate of the transitor that will make that gate to drop to 0 or negative allowing the 19 volts to pass all over the circuit . so replaced system charger after replacing system charger somehow PD22 got damaged , not allowing pin1 of system charger to receive power , replaced pd22 and all good , cheked coils , 5 and 3.3 on . i turn on machine , it turns on , but turn off . in that isntance i can measure very quickly the S0 of major coils , telling me they are giving correct values . for exception of PL22 PL23 does dont give me any values , but cheking them , got pl22 180ohm , pl23 22.5 ohm , compairing to outher board i got here , same ohmic value , so not a possible short on the 1.05 line .
im gonna now test S3 and S5 states n the KB , if all good im out of ideas.

any tought are welcome

[ktmmotocross]

Re: rare AT6 dv600 board lots of issues , remaining a last one :P

test all switched power rails and when all ok check the powergood logic

[highpulse]

Re: rare AT6 dv600 board lots of issues , remaining a last one :P

well cheking for KBC issue , and signal are beeing sent when pressing on , and the signal it should be receiving it is receiving , only signal not sent by KBC when pressing on off switch is the ECPWROK