HP DA0R62MB6E1 Rev E Startup problem

[NConstantinou]

Hi all
i have the above motherboard which has the 19v rail, on PL11 i have 2.5v(battery coil), i have on BIOS and KBC 3.3v, power button 3.3v BUT i do not have the 3&5 V rails AND THERE IS NO SHORT.
the PL22 (3v coil) gets the voltage from a capacitor pc223. pc223 one side has 4.89v and the side connected to the coil is 0v. capacitor is not short.
same with PL24 (5v) is connected to pc234 witch on one side is 4.89v and the other side which is connected to pl24 is 0v.
on IC PU9 and PU10 the S5_ON pins are 0v.
Tracing S5_ON is comming from KBC3940.
is it a problem with KBC!If YES
is there any compatible IC!
On power switch i have 3.3v and when i press it goes to 0V and then to 3.3v.
on PQ32 one side is 19v and the other side is 2.5V charging mosfet

Please advice

Thanks

[mcplslg123]

Re: HP DA0R62MB6E1 Rev E Startup problem

Check pin11 of PU9/10 for shorting. What is the voltage on PIN 1/6/7/11 of PU9??

[NConstantinou]

Re: HP DA0R62MB6E1 Rev E Startup problem

Thanks for the reply

on pin 11 of pu9 i get 3.3v
on pin 11 of pu10 i get 5v

pu9 pins

1- 19v
6- 3v
7-0v
11-5v

[mcplslg123]

Re: HP DA0R62MB6E1 Rev E Startup problem

It seems ok, Pin7 no voltage output is expected when EN is missing. Missing S5_ON is the issue. Try replacing KBC. I dont think there is any alternative to Ene3940.

[mcplslg123]

Re: HP DA0R62MB6E1 Rev E Startup problem

However, before going for kbc replacement, have you checked all the requirement of kbc??

[NConstantinou]

Re: HP DA0R62MB6E1 Rev E Startup problem

Not really because i thought if i do not have S5_ON then there is problem with kbc.
keep in mind that PQ32 Mosfet on one side i have 19v and on the coil side 2.5v.
does this matter!

Thanks

[mcplslg123]

Re: HP DA0R62MB6E1 Rev E Startup problem

For any IC to work, you need to check its basic requirement first. If all the requirements are not met, definitely no output. Same applies to kbc as well. Pq32 is not bothering me at this stage. first we need to fix 3/5 alw line.

[ktmmotocross]

Re: HP DA0R62MB6E1 Rev E Startup problem

first u need to fix 3VL line for KBC standby. without it u dont have EN signal for 3/5V.

[barkinaksoy]

Re: HP DA0R62MB6E1 Rev E Startup problem

Hello i have the same problem as here did you fix it ?

[Sametbey]

Re: HP DA0R62MB6E1 Rev E Startup problem

PQ32 one side is 19v and the other side is 2.5V normal. Is there a light in the capslook led lamp, blink. its need bios programming