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Dell Inspiron 1520 power chip disable.
#1
Good day!

I have notebook Dell Inspiron 1520 (core 2 duo t7500, bios v. A09), but a few time ago cpu perfomance became lower (3 GFlops instead 10 GFlops). According to some sources, Dell power adaptors contain special chip that confirmes originality of power adapter, and if this chip is dead, you can't use cpu on full power.
So I have a question, can this problem be solved by disabling scanning by hardware power chip data directly in bios?

Thanks in advance.
find
quote
#2
Many notebook manufacturers have this same feature, the notebook will reduce performance if, for example, a 65w power adapter is used instead of a 90w adapter. My understanding is that this is done with a resistor, much lower tech than any special chip. The center pin of your power adapter outputs a specific voltage to let the laptop know which power adapter is in use (this is typically low, 1.5v - 5v, and can be measured with a multimeter) If that center pin breaks or begins to output the wrong voltage due to a defect in the adapter, the laptop assumes the lowest wattage adapter to be in use.

Do you have a working 90w adapter available for comparison to verify voltage output on this center pin and compare it to yours?
find
quote
#3
(07-11-2014, 09:18 AM)siryoink Wrote: Many notebook manufacturers have this same feature, the notebook will reduce performance if, for example, a 65w power adapter is used instead of a 90w adapter. My understanding is that this is done with a resistor, much lower tech than any special chip. The center pin of your power adapter outputs a specific voltage to let the laptop know which power adapter is in use (this is typically low, 1.5v - 5v, and can be measured with a multimeter) If that center pin breaks or begins to output the wrong voltage due to a defect in the adapter, the laptop assumes the lowest wattage adapter to be in use.

Do you have a working 90w adapter available for comparison to verify voltage output on this center pin and compare it to yours?
Yes, I read this details in sources, but I don't have any other equipment. Still may be it can be disabled in bios?
find
quote
#4
(07-13-2014, 02:40 AM)X-ray555 Wrote: Yes, I read this details in sources, but I don't have any other equipment. Still may be it can be disabled in bios?

Before anyone makes the effort to do that, and btw it may not even be possible, wouldn't it be better to verify if the problem may be that your ac adapter is actually going bad? If there's truly a voltage drop from the adapter, you could damage your motherboard by overriding that feature. A new AC adapter costs between $10 - $30.
find
quote
#5
(07-13-2014, 05:05 PM)siryoink Wrote:
(07-13-2014, 02:40 AM)X-ray555 Wrote: Yes, I read this details in sources, but I don't have any other equipment. Still may be it can be disabled in bios?

Before anyone makes the effort to do that, and btw it may not even be possible, wouldn't it be better to verify if the problem may be that your ac adapter is actually going bad? If there's truly a voltage drop from the adapter, you could damage your motherboard by overriding that feature. A new AC adapter costs between $10 - $30.

It seems I've found the problem - pin departs. Today I was moving power connector for a while and after that full power was restored (12 GF in Linx and battery charging). But I don't know, is this bad contact in power connector or in case socket. And I still think it would be best solution to modify bios, that perfomance became independent from any stupid connectors, isn't it?
find
quote
#6
I'm speaking from working on HP boards here, under the assumption that Dell is wired similarly, but there's usually a gated MOSFET inside that opens/shuts based on voltage input from that pin.

Having a shorted connection to that pin in your power supply plug means your problem is eletrical. No voltage from the pin = gated mosfet closed = lower power draw. Telling the BIOS to force the CPU to run at a higher frequency while undervolted would not likely produce the desired results.
find
quote


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