asus k43s laptop no 3v and 5v

[String2016]

I have a asus k43sv rev 3.0, when plugged in the charger 19v rail is present but there is no 3v and 5v on coil, i noticed that RT8206A chip is getting very hot.anyone can help on this please

[SMDFlea]

Re: asus k43s laptop no 3v and 5v

Whats your usual plan for dealing with a hot IC like this ? Measure voltage and resistance to GND.

[String2016]

Re: asus k43s laptop no 3v and 5v

replaced ic?

[Techtiger]

Re: asus k43s laptop no 3v and 5v

replaced ic?

Whats your usual plan for dealing with a hot IC like this ? Measure voltage and resistance to GND.

Check the resistance ( SMDflea ) check all the caps connected to pin

[SMDFlea]

Re: asus k43s laptop no 3v and 5v

Check the resistance ( SMDflea ) check all the caps connected to pin

I was asking @mulong2019 ,i forgot to quote his post in my reply.

[String2016]

Re: asus k43s laptop no 3v and 5v

I have attached the photo of caps around the ic the two caps on the left measured 0.00kohms and on the right cap shows OL .

[String2016]

Re: asus k43s laptop no 3v and 5v

any help

[mcplslg123]

Re: asus k43s laptop no 3v and 5v

datasheet is available for RT8206A. You need to measure voltage on certain pins like VIN/LDO/EN1/EN2/ENLDO/VOUT/PGOOD. Measure resistance on suspect pins.Usually replacing a hot ic wont solve the issue. The IC is getting hot as some voltage rail is shorted. You need to findout which is the culprit rail. Else, it"ll be sheer wastage of time. Succesful repair can be carried out only if you have a clear & well understood strategy.

[String2016]

Re: asus k43s laptop no 3v and 5v

here is measurement of the RT8206a
PIN6 VIN=19V
PIN7 LDO=0.27V
PIN4 ENLDO=6.27V
PIN 14 EN1=0V
PIN 27 EN2=0V
PIN10 VOUT=0V
PIN13 PGOOD1=0V
PIN28 PGOOD2=0V

does this ic is bad?

[Conste]

Re: asus k43s laptop no 3v and 5v

IC is probably not bad, but one of the outputs is shorted

Could be Super I/O, had this before

[String2016]

Re: asus k43s laptop no 3v and 5v

but why is the ic is burning hot? i check the caps connected to the ic no short

[mcplslg123]

Re: asus k43s laptop no 3v and 5v

Check +3V EC is shorted or not. What is the resistance on Vout pin??

[TiteLive]

Re: asus k43s laptop no 3v and 5v

Hi,

I have also an issue with a RT8206A device on an ASUS U36SD motherboard:

Thanks

[SMDFlea]

Re: asus k43s laptop no 3v and 5v

Hi,

I have also an issue with a RT8206A device on an ASUS U36SD motherboard:

Thanks

Its a different model, so its off-topic. Start your own thread please .