LA-3741P issue with TPS51120

[rookieme]

I need some help with this MB.
Schematic available at
https://www.badcaps.net/forum/showth...24#post1272124

I have the 19,5V but not the 3,3 & 5 V.
TPS51120 gets warm
VREF2 = 2.00V
VREG3 = 1,01V
VREG5 = 4,99V

so far I have replaced the TPS but with same results
I cannot find any short
I have removed PJP4, PJP5 & PJP12 and after the PQ4,PQ5, PQ6 & PQ7.
the VREG still is low

Could the second TPS I had to be faulty too? I don't have more to try.

[Techtiger]

Re: LA-3741P issue with TPS51120

Check if the +RTC_CELL /+3.3V_RTC_LDO & PC30 capacitor for any short And check the resistance to ground Diode mode pin 9/12/ 29/19

[rookieme]

Re: LA-3741P issue with TPS51120

105K at PC30
22K at +RTC_CELL

I have also injected 3V at PC30 to see if anything heats up but nothing came out.

[Techtiger]

Re: LA-3741P issue with TPS51120

Maybe the TPS replaced is faulty or +3.3V_RTC_LDO line is connected to PC 118 / PU7 check these two components fault

[rookieme]

Re: LA-3741P issue with TPS51120

PR160 is missing from the pcb and there is no connection between +3.3V_RTC_LDO and the PC118 / PU7

TPS could be faulty but it's strange that it has same output with the original one