Macbook A1989, 820-00850, won't boot. 20V, 0A.

[PITERPENY]

Today I have a MacBook A1989 at work 820-00850. When assembled, the laptop switches to 20 volts but the consumption is 0.00 ampere. if the motherboard is on the table then the consumption of all ports is 5 volts and0.35 amperes and does not go to 20 volts only if you assemble a MacBook.
Here are some measurements, maybe someone can tell what the problem is.
The initial problem was a burnt out induction coil L8504 (replaced).
When connected to another MacBook, it constantly hangs in dfu and cannot install updates, something is wrong.
here are some measurementsmotherboard on the table).

• UB300
• 0V6 diode mode on [n:USBC_TA_CC1] at [p:CB313:1] =0.558
  0V6 diode mode on [n:USBC_TA_CC2] at [p:CB314:1] =0.564
  
  5V on [p:FB200:1]=5v
  3V3 on [p:CB308:1] =3.34v
  1V8 on [p:CB305:1]=1.795v
  1V8 on [p:CB306:1]=1.8v
  1V1 on [p:CB304:1]=1.12v
  
  ~26V on [p:QB300:1]=10.82v and [p:QB300:4]=7.15v
  Check [n:PPDCIN_G3H] on [p:QB300:8]=5v
• UB400
  0V6 diode mode on [n:USBC_TB_CC1] at [p:CB413:1]=0.7
  0V6 diode mode on [n:USBC_TB_CC2] at [p:CB414:1]=0.7
  
  5V on [p:FB201:1]]=5v
  3V3 on [p:CB408:1]=3.34v
  1V8 on [p:CB405:1]=1.8v
  1V8 on [p:CB406:1]=1.8v
  1V1 on [p:CB404:1]=1.12v
  
  ~26V on [p:QB400:1]=10.82v and [p:QB400:4]=7.15v
  Check [n:PPDCIN_G3H] on [p:QB400:8]=5v
• U3100
  0V6 diode mode on [n:USBC_XA_CC1] at [p:C3113:1]=0.558
  0V6 diode mode on [n:USBC_XA_CC2] at [p:C3114:1]=0.564
  
  5V on [p:F3000:1]=5v
  3V3 on [p:C3108:1]==3.34v
  1V8 on [p:C3105:1]=1.796v
  1V8 on [p:C3106:1]=1.8v
  1V1 on [p:C3104:1]=1.12v
  
  Check 26V on [p:Q3100:1] =10.85v and [p:Q3100:4]=7.24v
  Check [n:PPDCIN_G3H] on [p:Q3100:8]=5v
• U3200
  0V6 diode mode on [n:USBC_XB_CC1] at [p:C3213:1]=0.550
  0V6 diode mode on [n:USBC_XB_CC2] at [p:C3214:1]=0.561
  
  5V on [p:F3001:1]=5v
  3V3 on [p:C3208:1]=3.34v
  1V8 on [p:C3205:1]=1.8v
  1V8 on [p:C3206:1]=1.796v
  1V1 on [p:C3204:1]=1.12v
  
  Check 26V on [p:Q3200:1]=10.81v and [p:Q3200:4]=7.48v
  Check [n:PPDCIN_G3H] on [p:Q3200:8]=5v
• 5V to 20V sequence
  USBC CC1/2 & T2-SMC I2C
  Diode mode ~0V6 on [n:USB_XA_CC1] at [p:C3113:1]]=0.558
  Diode mode ~0V6 on [n:USB_XA_CC2] at [p:C3114:1]=0.564
  Diode mode ~0V6 on [n:I2C_UPC_SDA] at [p:R5220:2]=0.421
  Diode mode ~0V6 on [n:I2C_UPC_SCL] at [p:R5221:2]=0.421
  
  Power getting to the CD3215...
  5V on [n:PP20V_USBC_XA_VBUS] at [p:F3000:1]=5v
  
  Basic CD3215 voltages + LDOs...
  3V3 on [n:PP3V3_UPC_XA_LDO] at [p:C3108:1]=3.34v
  1V8 on [n:PP1V8_UPC_XA_LDOA] at [p:C3106:1]=1.8v
  1V8 on [n:PP1V8_UPC_XA_LDOD] at [p:C3105:1]=1.795v
  1V1 on [n:PP1V1_UPC_XA_LDO_BMC] at [p:C3104:1]=1.12v
  
  Open [p:Q3100] so power goes through to [n:PPDCIN_G3H]...
  >5V on [n:UPC_XA_GATE1] at [p:Q3100:1]=10.84v
  >5V on [n:UPC_XA_GATE2] at [p:Q3100:4]=7.24v
  5V on [n:PPDCIN_G3H] at [p:C7000:1]=5v
  
  Power to the ISL [p:U7000] ...
  (in) 5V on [n:TBA_VDDA] at [p:C7075:1]=5.15v
  (out) >=3V3 on [n:CHGR_EN_MVR] at [p:R6907:2]=5.15v
  
  Getting [n:PP3V3_G3H_RTC] ...
  3V3 on [n:PP3V3_G3H_RTC] at [p:L6900:1]=3.38v
  
  20V switch over...
  20V on [n:PP20V_USBC_XA_VBUS] at [p:F3000:1]=5.08v
  >20V on [n:UPC_XA_GATE1] at [p:Q3100:1]]=10.84v
  >20V on [n:UPC_XA_GATE2] at [p:Q3100:4]=7.24v
  20V on [n:PPDCIN_G3H] at [p:C7000:1]=5v
  
  Final steps...
  5V on [n:TBA_AUX_DET] at [p:C7016:1]=5v
  MOSFETS [p:Q7030] and [p:Q7040] should now be open
  [p:U7000] should be generating [n:PPBUS_G3H]=12.31v

[PITERPENY]

I bought another working but blocked board! and moved T2 and u4770 (juice rum, I think so) to the blocked board, and the blocked T2 and u4770 to the board that is being repaired, so I have 5 boards with the same 5V symptoms and fluctuating values from 0-0.450A! what's wrong ?

[PITERPENY]

Did I transfer everything correctly or is something else needed? and do I need to transfer the u4770 or just the t2? both boards are not visible in dfu