A1706 820-00239-A no power

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

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.
 

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).
 

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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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
 

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

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.
 

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.
 

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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hgoncalves

Active member
Hi, I've replaced the UB300, and now the U3100 is steady, and all other ports are rebooting the meter...
Do you have any other ideas, or is better to give up on it?
 

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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