A1534 820-00244 no power

hgoncalves

Active member
HI,
I have an A1534 820-00244 that has no power.

At first it pulled 19.9V from ampmetter, but no amp.
I notice that PPBUS_G3H was low and so I replaced U7000 = ISL95530HIZ-TR5664 for an U7100 = ISL95530HIZ-TR5655 (not sure if compatible but I got none ISL95530HIZ-TR5664). For a while I geted the 8.7V on PPBUS_G3H but after a while it failed, and now only get 4.9V from ampmeter, and already replaced CD3215 but with the same result (4.9V).

Can you help?
 

hgoncalves

Active member
HI,
I get 1.1V on PP1V1_UPC_XA_LDO_BMC, but PP3V3_G3H only gets 2.8V
PPVIN_G3H_P3V3G3H has 5.2V on C6900. Is this ok?
 

2informaticos

Administrator
Staff member
1V1 LDO appears only on the powered port.
If you can't get it on the other CD3215 chip (when powered), there is a problem.
 

2informaticos

Administrator
Staff member
Why?
You can't get there more than the voltage provided by charger.
Be sure R6990 and R/C6994 are good.
Compare diode mode to ground at 3V3_G3H with good board.

You should try another CD3215 chip.
 

hgoncalves

Active member
R6990 has 9.9 ohm and R6994 has 0.06 ohm. C6994 seams to be ok, and the traces arte fine too.
I don't have other 820-00244 to compare, and I already replaced 3 cd3215 just to be sure, but the same result.
Can you give me a diode reference value of PP3V3_G3H? On my board I get 0.383V
 
Last edited:
Top