CQ61-310EJ No Power

[s_henya]

Hey guys,

got this laptop, with bad contacts on DC jack (didnt power at all finally)

found some corrosion both on charger connector and dc jack (comes with harness of 6 pins).

cleaned them both but with no power at all,
the led on the jack wont ever light.

tested voltages on ouput pins:

2 blacks are shorted
2 reds are shorted

between yellow to black 18.22v
between yellow to red 17.55v
between yellow to white 15.95v

the specs on charger shows 18.5v 3.5a

so i figured the charger and harness are OK,

when the harness is connected got almost nothing on the outputs.

i saw this chip confused to be mosfet SD840S
but by the datasheet its a 2 diode form.

tested between too legs got short,
lifted one leg but still got short bewteen pads,
now between two legs got nothing, so im gussing its fine.

im pretty cluless right now. so any help will be very appriciated.

Shai.

[dj_ricoh]

Re: CQ61-310EJ No Power

unsolder the bios and see if the light from the power jack its restored.
the board its like g61 like a mirror.
i ahd a problem like that and usually 90% got bios problem.
don`t ask me why but i manage to find the problems here on the forum.

[s_henya]

Re: CQ61-310EJ No Power

hey dj_ricoh,
thanks for the reply,
i tried removing the bios chip

but still got no power dc jack led didn't came on.

any more ideas before ordering a replacement board?

[fddizon]

Re: CQ61-310EJ No Power

download schematic of this mobo first and check signals on bios and ene chip to confirm if its bios issue.

by the way... s_henya, do you sell untouched scrap mobos? (when i say untouched, parts are complete, nothing taken from it)

[s_henya]

Re: CQ61-310EJ No Power

hey fddizon
thanks the the reply,

i ruled out the bios chip, i still got a short between 2 pads of the sd804s
and a major voltage drop when the bios chip was out.

im gussing something else failed,

using a schematic would help, il try to find one but so far no luck...

by the way about dead mobos,
i usually gather them for a while to a pile and sell them to scrap yards for 5$ a kilo.

[fddizon]

Re: CQ61-310EJ No Power

can i buy them @ $8 per kilo?

[fddizon]

Re: CQ61-310EJ No Power

try this one... might be the same

[s_henya]

Re: CQ61-310EJ No Power

thats looks good,
its my first real challenging fix on a laptop mobo,
so where do i start from?

fddizon pm me about the boards later i will help as much as i can..

[s_henya]

Re: CQ61-310EJ No Power

well i didnt find a solution so i ordered a used mainboard on ebay (a little less than 100$)

but i think i made a mistake.

im starting to think that the charger is BAD,

between outer circle (-) and center pin(+) i get 17.52v
between inner circle (-) and center pin(+) i get 17.35v
between outer circle (-) and inner circle(+) i get 0.076v

is this reasonable?
i got today a hp probook with charging problems
(wont charge the baterry, replaced to new original battery but won't charge)
it has a universal charger
between outer circle and center pin i get 0
between outer circle (-) and inner circle(+) i get 19.37v

so i tested the CQ61 with the universal adaptor there is a light for 3 secs on dc jack.

i think that both of them are faulty.

please HELP!

[khaahk]

Re: CQ61-310EJ No Power

The outer circle is GND
Inner circle is +V
Center pin is ID (when not connected shows about +V, when connected to mainboard, should be 7-8 V)
When ID voltage is less, machine won't turn on.
You can emulate a smart adapter by connecting a resistor of ~200kOhm from V+ to ID pin.

[s_henya]

Re: CQ61-310EJ No Power

thank you khaahk, so that means that the original charger was BAD,
(were where you when i started this thred) :-)
(stupid charger wasted me hours)

So there is some progress, the charging light now lights!
but still no power when i press the power button.
(without the universal adaptor on battery only)
when i press the power button all 3 lights blinks 3 times

[dj_ricoh]

Re: CQ61-310EJ No Power

usually i`ll start with bios.
i`ll see tomorrow if i got a dump file so you can reprogram and test it.

[vinkos]

Re: CQ61-310EJ No Power

Blinking 3 times is problem with memory !
Maybe you forgot to put memory stick back !

http://h10010.www1.hp.com/ewfrf/wc/d...name=c01443366

[s_henya]

Re: CQ61-310EJ No Power

no the laptop wont ever power on
im not talking about power on with black screen
anyway the memory is inside.

i will try to get another charger in a couple
of hours and report back.
if it wont work i will open it back to check
bios voltages

[dj_ricoh]

Re: CQ61-310EJ No Power

its not a bad investment if you buy another bios from the web.
or maybe you got a spare one

[aknet_pc]

Re: CQ61-310EJ No Power

i have cq61.dc jacks light is on. but the computer doesn't work i think this problem is bios can you help me.please?