DA0AX1MB6H1 (HP G62-358CA) - Does not turn on & Adapter Led light off when plugged

[orientalsniper]

Re: DA0AX1MB6H1 (HP G62-358CA) - Does not turn on & Adapter Led light off when plugge

Thank you, I just did, I applied current to PR228 and I hear a buzzing sound that doesn't stop, but I can't well place it, but it's in the area where I took the pictures from. I'm going to try to increase the voltage.

[khaahk]

Re: DA0AX1MB6H1 (HP G62-358CA) - Does not turn on & Adapter Led light off when plugge

If you are looking for shorts using lap power supply, keep the voltages low or you can trigger different semiconductors and get very confusing results (including buzzers in some other part of the mainboard). If the part of the circuit is in short, then 1V (limited to 1-2 Amps) is enough to sort out the shorted part.

[orientalsniper]

Re: DA0AX1MB6H1 (HP G62-358CA) - Does not turn on & Adapter Led light off when plugge

You are right, RT8206B was buzzing, so I ordered a replacement already... lol

[rtstorm]

Re: DA0AX1MB6H1 (HP G62-358CA) - Does not turn on & Adapter Led light off when plugge

RT8206B is not a easy replace component, do you have some easy method for replacing this part?

[orientalsniper]

Re: DA0AX1MB6H1 (HP G62-358CA) - Does not turn on & Adapter Led light off when plugge

Yeah, I already desoldered it, I have Hot Air rework machine.

[bluestone]

Re: DA0AX1MB6H1 (HP G62-358CA) - Does not turn on & Adapter Led light off when plugge

have you been able to solve it now

[orientalsniper]

Re: DA0AX1MB6H1 (HP G62-358CA) - Does not turn on & Adapter Led light off when plugge

Not yet, but I ordered the power IC, should be coming in 2-3 weeks. Had so much to repair this last week, I promise I will update with resolution.

[orientalsniper]

Re: DA0AX1MB6H1 (HP G62-358CA) - Does not turn on & Adapter Led light off when plugge

Alright, I'm back, I replaced RT8206B and I got the following readings:
1: 2V
3: 5V
4: 14.6V
6: 19V
7: 5V
14: 3V
19: 5V
27: 4.7V

Yet it won't turn on, DC jack still won't light on.

[orientalsniper]

Re: DA0AX1MB6H1 (HP G62-358CA) - Does not turn on & Adapter Led light off when plugge

I left it unsupervised for a bit and the damn board was smoking, saw the KBC chip (KB3926QF) and the RT8206B burnt out.

Was the KBC chip damaged or did something else damage it?

[orientalsniper]

Re: DA0AX1MB6H1 (HP G62-358CA) - Does not turn on & Adapter Led light off when plugge

Welp, I put it another new RT8206B without KBC and it got smoked too. I only bought 5 of these

[lgcyber]

Re: DA0AX1MB6H1 (HP G62-358CA) - Does not turn on & Adapter Led light off when plugge

Hi... I was just wondering... have you resolved this problem already? I'm curious because I have the same problem and maybe you can help me a bit with this. Thanks.

[orientalsniper]

Re: DA0AX1MB6H1 (HP G62-358CA) - Does not turn on & Adapter Led light off when plugge

Sorry, I couldn't solve it, but you should check voltage regulator, charging IC, KBC and BIOS, use a lab power supply to detect shorts through heat.

[dycc]

Re: DA0AX1MB6H1 (HP G62-358CA) - Does not turn on & Adapter Led light off when plugge

RT8206B is not a easy replace component, do you have some easy method for replacing this part?

got good flux like AMTEC , hakko tips for iron solder ,good hot air gun

[dycc]

Re: DA0AX1MB6H1 (HP G62-358CA) - Does not turn on & Adapter Led light off when plugge

those board have always the same issue . after flashing bios if the lapy still not turn on replace EC KB3926 by the same or by KB926

southbridge

1-check for +3VS5 when turning on (without this voltage the southbridge will not reply to the EC )

2-check EC RSMRST# 3.3v when turning on

3- check EC DNBSWON# if it is high(3.3v) it must be 0v when turning on or 3v if it is low(0v)

without those voltage assume EC is not good

4-check EC SUSC# 3.3v when turnin on
5-check EC SUSB# 3.3v when turnin on

if SUSC# SUSB# are not present assume southbridge is not good

for those who don't have +PRWSRC(19v pq52 pin3) check pin1 pq52(must be 28v) if not , replace pq55 P MOSFET(even if it seem to work).

[kuldeep]

Re: DA0AX1MB6H1 (HP G62-358CA) - Does not turn on & Adapter Led light off when plugge

most probably CPU Section mosfet are faulty ..so pull out n check it ..19v at current limiting resistance(R020)..& generation of 5v & 3.3v