No AC Adapter installed Dell 15 5570 LA-F115P

[mferna14]

Hi all, I am working on this Dell 15 5570 ( Motherboard LA-F115P). The problem was battery not charging but it was working on AC power with Original Power adapter. Upon diagnosing, no PSID. Found that PD1 (Double Zener Diode Package) blown. Replaced it with another one. Now whenI turn on the motherboard with the ON/OFF switch , only then I get PSID 3.3V & works fine with the AC power adapter, but in the BIOS setup it say "AC Adapter Not Installed" & battery does not charge at all. I am using the Original Power adapter. I am listing pin voltages of the ISL9538HRTZ. Hope someone can help please, Thank you
PSID = 3.3V only with power switch is turned on. In Standby mode, no Volts
The voltage below are all in Standby Mode.
ADP = 19.58V (Pin 16)
DCIN = = 19.28 (Pin 17)
VDD = 5.1V (Pin 18)
ACIN = = 3.7V (Pin 19)
ACOK = 3.0V (Pin 24)
CSIP = 19.58V (Pin 15)
CSIN = 19.58V (Pin 14)

[mcplslg123]

Re: No AC Adapter installed Dell 15 5570 LA-F115P

SDA/SCL pin status??

[mcplslg123]

Re: No AC Adapter installed Dell 15 5570 LA-F115P

Remove PD1 again and test the mb without it. Are you sure replacement part is same as original??

[mferna14]

Re: No AC Adapter installed Dell 15 5570 LA-F115P

Thanks mcplslg123 for the tips... PD1 was the same as original., & without PD1, there was not a difference, the only thing I got back the PSID 3.3v. Even if the PD1 (Protection Diode Package) is not installed will not make a difference, isn't it just for protection & PD1 soldered or not will it make a difference??? I will check SDA/SCL today. Are the above given voltages from the ISL chip correct??

[mon2]

Re: No AC Adapter installed Dell 15 5570 LA-F115P

What are the voltage readings to ground on each pin of PQ1 ?

Often, PQ1 will get killed. If you remove it and bridge source & drain pins on the mosfet pads, then the EC controller will receive direct contact with the PSID pin of the power adapter.

The 3v3 voltage from the pull-up is used to power this parasitic single wire ID device from Dallas Semiconductor (then Maxim and now Analog Devices).

Be sure to review the datasheet for PQ1 to locate the source / drain pins.

[mferna14]

Re: No AC Adapter installed Dell 15 5570 LA-F115P

SDA/SCL pin status??? High when turned on (3.1V)
Thanks mon2 :: What are the voltage readings to ground on each pin of PQ1 ? On PQ1 Drain=3.3v Source=3.3V Gate= 5V
PSID is being generated 3.3V. Need to know whether this voltage is present when the motherboard is in Standby or off position?
But still it turns on fine with the AC power adapter, only it shows "Adapter not installed" in the BIOS Setting. Why is this so??

[mon2]

Re: No AC Adapter installed Dell 15 5570 LA-F115P

Any chance that you have another known good Dell adapter for testing?

Sounds like the single-wire communication is not progressing through between source & target. The single-wire ID device is embedded inside the Dell adapter.

You can try to scope the PS_ID line to see if there is any traffic or not but the 3v3 could be the static pull-up voltage from the EC side.

Gate @ 5v is good to enable the PQ1 mosfet. As long as PQ1 is not leaking, then PQ1 will act like a SPST switch when enabled.

To remove PQ1 from the equation, you can remove it and bridge source & drain pins but do confirm the pinout.

[mferna14]

Re: No AC Adapter installed Dell 15 5570 LA-F115P

Thanks mon2 I will do this what you have told me. I am using an Original Dell power adapter. I know that it was not giving any problem with other laptops. I will try again. I will remove PQ1 & jump source & drain so that I may know where the problem is.

[mcplslg123]

Re: No AC Adapter installed Dell 15 5570 LA-F115P

Removing PQ1 and putting ajumper between source and drain is the first step i do for dell psid problems.

[mferna14]

Re: No AC Adapter installed Dell 15 5570 LA-F115P

Thanks mcplslg123, I will do that today as I was busy with another unit yesterday.

[mferna14]

Re: No AC Adapter installed Dell 15 5570 LA-F115P

I did excatly what you guys told me to do. Removed PQ1 & jumped soure & drain. But I was getting PSID 3.3V after replacing the shorted Protection Diode, no difference. 3.3V I was getting before & after. Till now when I go to BIOS setup it shows "AC ADAPTER NOT INSTALLED" where as it working on AC Power it should show "AC Adapter UNKNOWN". & this is not the case when the adapter plugged in is 100% original. Where am I going wrong, Cannot understand. Do you thing BIOS has to be re-programmed or bad I/O controller chip?

[mcplslg123]

Re: No AC Adapter installed Dell 15 5570 LA-F115P

PUB01,pin8 voltage
PUB02,Pin4 voltage
MEC1416,Pin36/8/9/128//69/ voltage

Measure and report back.

[lapfix]

Re: No AC Adapter installed Dell 15 5570 LA-F115P

i face many dell with the same issue , and most of them was solved by replacing the 33ohm resistance , so test PR1

[mferna14]

Re: No AC Adapter installed Dell 15 5570 LA-F115P

Thanks Lapfix., First thing what I did was replace the 33ohms resistor & the protection diode. Still having the same error message.

[mon2]

Re: No AC Adapter installed Dell 15 5570 LA-F115P

Check the output of this comparator. What is the voltage to ground

a) with adapter ?

b) without adapter but using battery ?

c) ACIN_CHG pin ? Built from the resistor based voltage divider.

[mferna14]

Re: No AC Adapter installed Dell 15 5570 LA-F115P

Will do so, thanks mon2.... really appreciate your help. I had another notebook of this kind but not the same motherboard. PSID should be present the moment we plug in the AC power adapter jack in standby state., & not in the laptop ON status. So this this case 3.3V does not appear on PSID in Standby state, it only has the PSID 3.3v when I turn on the laptop. Here is the really cause of my problem!

[mcplslg123]

Re: No AC Adapter installed Dell 15 5570 LA-F115P

@mon2, from OP's post#1, its mentioned pin19 at 3.7V and thats correct.

[mcplslg123]

Re: No AC Adapter installed Dell 15 5570 LA-F115P

PUB01,pin8 voltage
PUB02,Pin4 voltage
MEC1416,Pin36/8/9/128//69/ voltage

Measure and report back.

@mferna, choose to ignore??

[mcplslg123]

Re: No AC Adapter installed Dell 15 5570 LA-F115P

Will do so, thanks mon2.... really appreciate your help. I had another notebook of this kind but not the same motherboard. PSID should be present the moment we plug in the AC power adapter jack in standby state., & not in the laptop ON status. So this this case 3.3V does not appear on PSID in Standby state, it only has the PSID 3.3v when I turn on the laptop. Here is the really cause of my problem!

Perhaps not. have you worked on LA-J091P motherboard. PSID voltage is present only after turning on -I too thought it should be present in off condition but thats not the case on this mb. Not sure about LA-F115

[reformatt]

Re: No AC Adapter installed Dell 15 5570 LA-F115P

Will do so, thanks mon2.... really appreciate your help. I had another notebook of this kind but not the same motherboard. PSID should be present the moment we plug in the AC power adapter jack in standby state., & not in the laptop ON status. So this this case 3.3V does not appear on PSID in Standby state, it only has the PSID 3.3v when I turn on the laptop. Here is the really cause of my problem!

I'd say so. Refer to pg3 of the schematic, +3VALW will be present in S4/S5 power states unless an AC Adaptor is installed. So if this is missing in standby, the indicates that there is something wrong the adaptor sensing logic. Any data from the PS_ID circuit is irrelevant in this case.

Destruction of the diode for PSID indicates the charger plug probably collapsed (shorting 19V onto the PSID line). Other damage around the input may have occurred potentially, so I'd be looking closely around PQ3/PQ4, AC_OK (PR13/15 should be around 2V or so). PWR_SELECT indicates which adaptor is in use, should be high for barrel, low for USB C. Gives you an avenue to investigate.