Aspire 4736z KALG1 schematics

[salawayon]

Any one could share the schematics of KALG1 LA-5272P? Unit is totally dead... Tried already replacing ENE and isl6237... Switch voltage is always at 19vdc.

Thanks....

[jtamad44]

Re: Aspire 4736z KALG1 schematics

try to flash the bios.

[PlusCom]

Re: Aspire 4736z KALG1 schematics

Schematics.

[salawayon]

Re: Aspire 4736z KALG1 schematics

Is it possible due to bios problem why it is totally dead? I'm concerned with the supply voltage at the power switch that instead of 3.3vdc i got 19vdc. Which is not normal for me.

Thanks for the schematics.

[Francisco.s]

Re: Aspire 4736z KALG1 schematics

at the power switch that instead of 3.3vdc i got 19vdc. Which is not normal for me.

High voltage in power switch, is perfectly normal. It comes from PQ1 (page 37) trough its internal diode, and PR12/ PR13, reaching the 51ON# point.
Check pin 8 voltage of U13 (bios chip) in order to know if there is +3VALW.

[salawayon]

Re: Aspire 4736z KALG1 schematics

Thanks for the info.... BTW, is +3VALW is same with +3VALWP? I'm just a bit confused with the power up sequence of laptop computers. Just really wanted to know everything why it became dead. Because at some brands i always got 3.3vdc at power switch line.

[Francisco.s]

Re: Aspire 4736z KALG1 schematics

Yes, +3VALW is the same as +3VALWP, they are joined by PJ2. (JUMP_43X118)
You can cut down pj2, in order to isolate both voltages.

[salawayon]

Re: Aspire 4736z KALG1 schematics

When it will became 3.3vdc at switch line, after pressing the switch when everything is ok?or it will always be at 19vdc during standby?

[salawayon]

Re: Aspire 4736z KALG1 schematics

Found it (PJ2) at p37. Maybe i'm dealing with same problem with lenovo g475 they got same schematics.

[Francisco.s]

Re: Aspire 4736z KALG1 schematics

+3VALWP should be there as soon as you connect ac adapter, and signal MAINPWON go to high level, and if PU4 is not damaged.

[salawayon]

Re: Aspire 4736z KALG1 schematics

No voltage is present at all pins of U13... Even +3VALWP at PU4 not present.... Tried already replacing PU4 but still the same.

[Francisco.s]

Re: Aspire 4736z KALG1 schematics

No voltage is present at all pins of U13... Even +3VALWP at PU4 not present.... Tried already replacing PU4 but still the same.

Check 19volts at pin 6 of PU4, PR35 could be open.

[salawayon]

Re: Aspire 4736z KALG1 schematics

19vdc at pin6 of PU4 is measurable. Do i have to replace again the PU4?

[bowor]

Re: Aspire 4736z KALG1 schematics

I'm trying to add. if no voltage 3/5valw of: ic power, embedded controller (ec), sb chipset, vga.

[whaldsz]

Re: Aspire 4736z KALG1 schematics

You have 19v right? now, Check the voltage of pin 1, 7, 4, 14, 27 of PU4.