No 5V found in this Circuit, Please help me.

[Compute]

Re: No 5V found in this Circuit, Please help me.

Yes motherboard works fully ok.

COOL

[Compute]

Re: No 5V found in this Circuit, Please help me.

asus X451ma Schematic.

This is written on the motherboard?

[Compute]

Re: No 5V found in this Circuit, Please help me.

this scheme is nowhere

[nazrul145]

Re: No 5V found in this Circuit, Please help me.

yes X451MA Rev 2.1

[Compute]

Re: No 5V found in this Circuit, Please help me.

this scheme is nowhere

I looked at all the closed resources, but this scheme nobody has

[nazrul145]

Re: No 5V found in this Circuit, Please help me.

OK, This ic marking is JC FL. i think it is RT8239B. it pin2 is 0.9v and pin4 is 5v. when i short pin4 to ground with twezer then 3.3v comes to Coil and power up laptop.

[Compute]

Re: No 5V found in this Circuit, Please help me.

Here about the same.
Resistor on pin 4 has a 100k?

[Compute]

Re: No 5V found in this Circuit, Please help me.

What is the marking of the transistor?

[nazrul145]

Re: No 5V found in this Circuit, Please help me.

pin4 248k and pin2 80k. when i remove pin 2 resistor 3.3v ok and when remove pin4 resistor 5v ok but when 2 resistor use motherboard 3.3v not come.

[Compute]

Re: No 5V found in this Circuit, Please help me.

pin4 248k.

100k resistor soldered here and check

[nazrul145]

Re: No 5V found in this Circuit, Please help me.

Transistor marking 4n34

[nazrul145]

Re: No 5V found in this Circuit, Please help me.

I uses 80k resistor and result same. When i put adapter power up laptop and shutdown after 2-3 second.

[Compute]

Re: No 5V found in this Circuit, Please help me.

I uses 80k resistor and result same. When i put adapter power up laptop and shutdown after 2-3 second.

I do not understand.
You've changed the resistor to pin 4 on 278k and put 80k resistor and the result is the same?

[Compute]

Re: No 5V found in this Circuit, Please help me.

In the datasheet says that the 2-pin and 4-pin stand at 100k resistors, try to put it to 100k for 2-pin and 4-pin

[nazrul145]

Re: No 5V found in this Circuit, Please help me.

yes same. also pin 4 have 5 so that 3.3v not going to coil.
when i remove pin2 resistor 3.3v ok when remove pin4 resistor 5v ok. but when use this two resistor only 5v continue present, but 3v come when adapter pluged in and turn off 2-3 second. that means 5v continue ok but 3v problem.

[Compute]

Re: No 5V found in this Circuit, Please help me.

In the datasheet says that the 2-pin and 4-pin stand at 100k resistors, try to put it to 100k for 2-pin and 4-pin

Just try to put resistors on 100k, not 80k, 100k is, it's not difficult, way to pin 2 and 4 should be a low level

[nazrul145]

Re: No 5V found in this Circuit, Please help me.

i connect 95k resistor to pin2 and 100k pin4 but same.

[Compute]

Re: No 5V found in this Circuit, Please help me.

Launch control duty 3 and 5 volts engaged EC, try to flash it flash drive

[nazrul145]

Re: No 5V found in this Circuit, Please help me.

reflash bios?

[Compute]

Re: No 5V found in this Circuit, Please help me.

reflash bios?

yes