Re: Dell Inspiron 5437
Let's see.
What is the voltage (to ground) of PU5102 chip pin1 and pin2 ?
Pin1 is EN when it is high it turns the chip on.
Pin2 is PG it shows if the chip output is good.
RememberTheViolin
Member
Last Activity: 09-29-2024, 03:51 AM
Joined: 05-11-2020
Location: Greece
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Last edited by RememberTheViolin; 06-11-2021, 12:31 PM. -
Re: Dell Inspiron 5720 (17r) DA0R09MB6H1 - No Display ?
Did you try to observe (or search online for information on) beep codes or flash led codes?Leave a comment:
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Re: Dell Inspiron 3537 - Powers Off
Good this chip is then fine.
Just out of curiosity what voltage on pin 7 (PGOOD for power is good haha)?Last edited by RememberTheViolin; 01-13-2021, 01:12 PM.Leave a comment:
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Re: Dell Inspiron 3537 - Powers Off
Yes, this is my thought as well.
It should not be zero. Why not measure it again to verify? Still zero?
If you see my posts i was working on the same chip the last days.
Not output 3v but receive 3V. You see EN1, EN2 stands for ENABLE which is a voltage that tells the chip to output voltage 1, output voltage 2.
The outputs are 3.3V and 5V.Last edited by RememberTheViolin; 01-13-2021, 01:04 PM.Leave a comment:
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Re: Dell Inspiron 3537 - Powers Off
I check the datasheet.Last edited by RememberTheViolin; 01-13-2021, 12:45 PM.Leave a comment:
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Re: Beginner's guidelines
Hi, if you are a beginner like me, you have a schematic pdf, but you do not understand the notation for resistors and capacitors, in order to replace something. Check these pictures....Leave a comment:
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Re: Dell Inspiron 3537 - Powers Off
Since you observe this chip.
Observe if you have VIN, EN1, EN2, SW1, SW2, pins 12,20,6,18,8.
Voltages. What do you measure?Last edited by RememberTheViolin; 01-13-2021, 12:22 PM.Leave a comment:
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Re: Dell 3542 powers on then off or goes to sleep
Hi techtiger,
yes PU4503 outputs 3.3v at pin8 confirmed.
PU4501 pins, 5,6,7,8 get 19V.
PC4518 is not installed from factory, empty pads. haha
No soldering iron (for the moment)
so, big capacitor PT4501 is not getting hot compared to PT4502
but PU4503 is getting instantly hot (instantly dries out from alcohol while
all other mosfets PU4501,PU4502,PU4504,PU4505 stay wet).
PU4503 probably dead....
So, quick pause for me to get a soldering iron.
Hi Sametbey....Last edited by RememberTheViolin; 01-13-2021, 10:59 AM.Leave a comment:
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Re: Dell 3542 powers on then off or goes to sleep
Hi,
What i mean with PL4501=oV is that this chip PU4503 is no longer working, it does not give me the 5V output anymore. I am wondering if it died. I have the measurements for all its pins (voltage and resistance to gnd) and investigating (attached below).
Heatsink fan is connected. 2 days ago (before PU4503 stopped working) after powerbutton was pressed, heatsink fan started and then stopped after 3 seconds. But i was able to do voltage measurements on other chip controllers (PU4901, PU4601,PU8201) which...Last edited by RememberTheViolin; 01-13-2021, 06:20 AM.Leave a comment:
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Re: Dell 3542 powers on then off or goes to sleep
ok. now sth happened.
voltage on PL4501=0V, and 0 ohm to gnd.
on PU4503 pin 7=0v (pgood), pin18=0v, pin2=0v.
so 5V ...off...Leave a comment:
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Re: Dell 3542 powers on then off or goes to sleep
I follow the steps of power sequence diagram that i found in the forum (page 97).
I took measurements
A. first with voltage on without pressing power button
B. second after pressing powerbutton
step(-4)
NPCE285 pin 33 A=3.2V B=3.2V
NPCE285 pin 19 A=3.2V B=3.2V
NPCE285 pin 115 A=3.2V B=3.2V (3D3V_AUX_KBC)
step(-1)
NPCE285 pin 15 A=3.1V B=3.1V (RSM RST #_KBC)
step(2)
NPCE285 pin 117 A=3.1V B=0V AND THEN AGAIN...Last edited by RememberTheViolin; 01-11-2021, 07:44 AM.Leave a comment:
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Dell 3542 powers on then off or goes to sleep
Dell inspiron 3542 -13269 1-with discrete graphics card on, i7 processor.
Do not have many tools. Multimeter.
And i am beginner at this.
So,
I am using bare motherboard, (without RAM, HDD, etc).
Power given from power adapter 19V output DC working ok.
I measured voltages on big coils (both ends) before i push the power button and after.
And also resistances of coils to ground.
----------------Before:--------------------- after-------------resistance to gnd
PL4902---0.00V 0.00V--------1.35V 1.25V --------0.4...Last edited by RememberTheViolin; 01-10-2021, 10:13 AM. -
Re: New Members - please post your introductions here
Hello!
My name is John.
I am here to learn more for electronics.
Beginner.Leave a comment:
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