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A1706 820-00239-A no power

H

hgoncalves

Active member
I think that are all normal...

U3100:
PP3V3_UPC_XA_LDO = 0.515V
PP1V8_UPC_XA_LDOA = 0.534V
PP1V8_UPC_XA_LDOD = 0.493V
PP1V1_UPC_XA_LDO_BMC =0.529V

U3200:
PP3V3_UPC_XB_LDO = 0.518V
PP1V8_UPC_XB_LDOA = 0.527V
PP1V8_UPC_XB_LDOD = 0.487V
PP1V1_UPC_XB_LDO_BMC =0.522V

UB300:
PP3V3_UPC_TA_LDO = 0.505V
PP1V8_UPC_TA_LDOA = 0.533V
PP1V8_UPC_TA_LDOD = 0.489V
PP1V1_UPC_TA_LDO_BMC =0.526V

UB400:
PP3V3_UPC_TB_LDO = 0.515V
PP1V8_UPC_TB_LDOA = 0.532V
PP1V8_UPC_TB_LDOD = 0.493V
PP1V1_UPC_TB_LDO_BMC =0.529V
 
2informaticos

2informaticos

Administrator
Staff member
JB500 has 2 USB-C ports.
Each port has 2 ways conection possible; 4 possibilities then.
Check which CD3215 gives the steadt¡y 5V.
 
H

hgoncalves

Active member
I belive that it is the UB300, because with that i have 5V on FB200.

I think that this one is the problem, because i have 0.150V in diode mode, and only 0.600 k ohm on FB200, while on F3000 i get 2.6 K ohm and 0.191V on diode mode (not sure if it makes sense to you).
 
H

hgoncalves

Active member
On UB300 i get the 1.1V
On UB400 i get 1.1V until reboots
On U3200 and U3100 I don't get the 1.1V. I get 0V on both 1.1V LDO lines, but i get 5V on F3000/1
 
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H

hgoncalves

Active member
I get 1V1 LCO on UB300 (steady), and on UB400 (until reboots meter).
I don't get it on U3100 and U3200, witch were the ones I replaced
 
H

hgoncalves

Active member
Yes i changed U3100 and U32000, both new from China.
Is there any way for me to confirm if the chips are ok? When i changed both, the meter went from black to reboot, and now i get 5V on both fuses, and a steady 4.97V on one of the ports (with original CD3215 UB300).
 
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2informaticos

2informaticos

Administrator
Staff member
Too many "new" fake chips from China.
I prefer wing boards they sell after cut off the main logic boards.
You can expect 10-30% of burnt chips.
At least the you can get original chips.
 
H

hgoncalves

Active member
I have a scrap board here from a 1706 and tomorow i'll reball those CD3215.
Can you send me some link from where you buy those wings?
Tks.
 
H

hgoncalves

Active member
Hi,
I replaced again both CD3215 (U3100 / U3200) for two from a scrap board, but with the same result. The meter is rebooting on 3 ports, and stays steady, at 4.97V, on one of the ports (UB300). All LDO lines are as they were before.
 
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2informaticos

2informaticos

Administrator
Staff member
If now power cycles, possibly problem on secondary power supplies.
Check them for short.

Also see what happens in SMC bypass mode.
 
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