Asus k43u no power

[String2016]

I have this Asus k43u PBL50 LA-7321P REV:1A, 19v is present but on power button and on JBTN1 pin 1 ON/OFFBTN# has 17v instead of 3.3v.on the bios chip there is no 3.3 on pin 8, anyone can help on this please

[Techtiger]

Re: Asus k43u no power

One of the components are faulty PU301 PQ303 PQ304

[String2016]

Re: Asus k43u no power

I check pq303 pin 1 and pin4 are beeping does this short?

[Techtiger]

Re: Asus k43u no power

I check pq303 pin 1 and pin4 are beeping does this short?

remove PQ303 out of the bed & test S D G if short replace RT8202 check voltage pin 16 13 17 3 8 14

[String2016]

Re: Asus k43u no power

@Techtiger thanks for the response, replaced pq303 mosfet now no beeping on the pin1 and pin 4 and here is the measurement of RT chip pu301

pin 13= 3v
pin16= 19v
pin17=5v
pin14=2v
pin3=2v
pin8=3.3v

[String2016]

Re: Asus k43u no power

On PQ303 no voltage on S and G on drain it has 1.5v fluctuating voltage

[Techtiger]

Re: Asus k43u no power

On PQ303 no voltage on S and G on drain it has 1.5v fluctuating voltage

do you get B+ on PL301 19V ?

[Techtiger]

Re: Asus k43u no power

@Techtiger thanks for the response, replaced pq303 mosfet now no beeping on the pin1 and pin 4 and here is the measurement of RT chip pu301

pin 13= 3v
pin16= 19v
pin17=5v
pin14=2v
pin3=2v
pin8=3.3v

the voltage on RT is fine what is the voltage on PL305?

[String2016]

Re: Asus k43u no power

PL301 have B+ 19v but PL305 both sides 0v

[String2016]

Re: Asus k43u no power

PQ305 pin1 S and pin4 G beeping

[String2016]

Re: Asus k43u no power

replaced PQ305 still same issue PL305 no voltage

[Techtiger]

Re: Asus k43u no power

check resistance to GND on PL303 PL305 left one PAD of each coil & try if the voltage is back if not replace PC305 PC303

[String2016]

Re: Asus k43u no power

PL303 Pullout 1 side= 11omhs PL305 pullout 1side =2.2ohms tried plugged in with 1 side pullout still no voltage on PL303 and Pl305

[Techtiger]

Re: Asus k43u no power

PL303 Pullout 1 side= 11omhs PL305 pullout 1side =2.2ohms tried plugged in with 1 side pullout still no voltage on PL303 and Pl305

11 & 2.2 Ohms is very less can you check ENTRIP 1/2 it's connected to GND with 133k & 162K Résister make sure no leak & PQ307 pin 2/5 voltage check if PQ307 for any faulty

[String2016]

Re: Asus k43u no power

I check pc305 is shorted beeping when i pulled it out same its beeping pc303 is not shorted, I cannot find same value on this cap on my scrapboard

[String2016]

Re: Asus k43u no power

Problem solved!!! replacd PC305 laptop is now turns on and working fine @techtiger thank you for your help