820-01700 5v 0.40amp no power

[Donlan78]

replaced cd3217 chips because of cycling issue, the cycling has stopped and i have solid 5v with 0.40 amps, but no power, ppbus is stabile at 12.30v and device is not in dfu mode, curious what to check next, seem to be missing pp3v3_s5

 

[2informaticos]

What about PPBUS_G3H and 3V3_G3H_RTC?
Did you follow all the steps to enter DFU ,ode?
Check SLPS2R and AWAKE voltages; on the small coils around U7800.

 

[Donlan78]

ppbus_d3h 12.30v
3V3_G3H_RTC 3.3v
P1V1SLPS2R_SW1 1.1v
P1V8SLPS2R_SW0 1.8v
PP1V8_AWAKE 1.8v
PP1V2_AWAKE 1.2v

just noticed that top right port u3200 is cycling every 12 sec or so
u3200 and u3100 have been replaced

 

[Donlan78]

what steps are you referring to, for entering dfu mode, keyboard combo isn't working, , how to i force enter dfu

 

[2informaticos]

Use SWK003 pads; see last page schematic.

 

[Donlan78]

was not able to force dfu,
still have 5v .30amp all ports, ppbus still only 12.30,
PP3V3_G3H_RTC_X is 3.3v, all ports still 5v .30 amp, i have 3 units all with same issue,
thermal cam shows T2 getting warm, not hot temp about 90 degrees

 

[2informaticos]

How did you try DFU with SWK003?
Must solder a tiny wire and connect charger.
When machine appears in AC2, cut off the wire.