Solve : HP Pavilion PSU or Mobo Dead?

1.	Solve : HP Pavilion PSU or Mobo Dead?
Answer» Hi; I have been asked to help fix a dead HP Pavilion DV4000 Laptop. The symptoms: Laptop is dead and will not switch on, either connected to the 240v mains or using just the battery, the owner has tried a different battery (which he believes is charged) but the Laptop will still not switch on. When the PSU is plugged into 240v outlet and is not connected to the DC in on the Laptop, the LED on the DC Jack lights up bright green. A voltage reading from the DC Jack shows 31v (Which is the stated output on the PSU). When the DC Jack is connected to the DC In on the Laptop the green LED diminishes and goes out, sometimes if you then switch off the 240 supply and then switch it back on again the green LED lights up but is dim and flickers. On dismantling the Laptop the DC In socket appears to be intact and there are no obvious signs of burnt out components on the motherboard however, when removing the CPU cooler the top of the CPU was black dust and the cooling paste seemed minimal and dry. The CPU pins look OK. According to a post I found via google the LED symptoms appear to point to a short circuit somewhere from the DC In Jack however this links then went on to suggest buying a new PSU which clearly would not resolve a short circuit so I am dubios?? Any help with this would be great. Thanks It SEEMS like the voltage regulator circuit (usually contained on the motherboard) is dead. There is nothing more you can do EXCEPT to replace the motherboard & hope it works. Better to sell the whole thing for parts.Quote from: Computer_Commando on JULY 04, 2011, 11:13:47 AM It seems like the voltage regulator circuit (usually contained on the motherboard) is dead. There is nothing more you can do except to replace the motherboard & hope it works. Better to sell the whole thing for parts. Managed to find a couple of replacement mobo's on ebay but at £50 and not certain that its the problem I'll not chance it, its an old Laptop and a replacement would probably be money better spent. Thanks Quote from: JonnyAlpha on July 04, 2011, 02:58:09 PM ...not certain that its the problem I'll not chance it, its an old Laptop and a replacement would probably be money better spent... Exactly!!Hi, before i go any further and please do not feel insulted for this, all HP pc's are crap, they have good prices, and specifications but they all die within less than a year and 2 YEARS. Ok now back to the problem. I had a customer with a similar problem actually with the same model of laptop you have. The problem was the adapter jack. I had to dissasemble the whole laptop and replace the jack for for a new one ( it cost like 15 $ -20$), the problem for you depends on your experience on computers to do this and then reassamble it again. If you take it to a tech, they could charge you from 80$+ just to try this. The other problem could be the mobo (motherboard) it could be burned out. If so, then consider buying a new pc; perhaps, you can take the dvd drive, rams, hdd and SCREEN to sell it and get some money back. Remember this is just a suggestion since i cannot see the problem, we only answer depending on the information you provide Ignore the above post Quote from: Serune on July 09, 2011, 07:19:57 PM Hi, before i go any further and please do not feel insulted for this, all HP pc's are crap, they have good prices, and specifications but they all die within less than a year and 2 years. Apart from one of mine, which has been used daily for six years. Quote from: Serune on July 09, 2011, 07:19:57 PM Remember this is just a suggestion since i cannot see the problem, we only answer depending on the information you provide Is that the royal 'we'

Answer»

Hi;

I have been asked to help fix a dead HP Pavilion DV4000 Laptop.

The symptoms:

Laptop is dead and will not switch on, either connected to the 240v mains or using just the battery, the owner has tried a different battery (which he believes is charged) but the Laptop will still not switch on.

When the PSU is plugged into 240v outlet and is not connected to the DC in on the Laptop, the LED on the DC Jack lights up bright green. A voltage reading from the DC Jack shows 31v (Which is the stated output on the PSU).

When the DC Jack is connected to the DC In on the Laptop the green LED diminishes and goes out, sometimes if you then switch off the 240 supply and then switch it back on again the green LED lights up but is dim and flickers.

On dismantling the Laptop the DC In socket appears to be intact and there are no obvious signs of burnt out components on the motherboard however, when removing the CPU cooler the top of the CPU was black dust and the cooling paste seemed minimal and dry.

The CPU pins look OK.

According to a post I found via google the LED symptoms appear to point to a short circuit somewhere from the DC In Jack however this links then went on to suggest buying a new PSU which clearly would not resolve a short circuit so I am dubios??

Any help with this would be great.

Thanks

It SEEMS like the voltage regulator circuit (usually contained on the motherboard) is dead. There is nothing more you can do EXCEPT to replace the motherboard & hope it works. Better to sell the whole thing for parts.Quote from: Computer_Commando on JULY 04, 2011, 11:13:47 AM

It seems like the voltage regulator circuit (usually contained on the motherboard) is dead. There is nothing more you can do except to replace the motherboard & hope it works. Better to sell the whole thing for parts.

Managed to find a couple of replacement mobo's on ebay but at £50 and not certain that its the problem I'll not chance it, its an old Laptop and a replacement would probably be money better spent.

Thanks Quote from: JonnyAlpha on July 04, 2011, 02:58:09 PM

...not certain that its the problem I'll not chance it, its an old Laptop and a replacement would probably be money better spent...

Exactly!!Hi, before i go any further and please do not feel insulted for this, all HP pc's are crap, they have good prices, and specifications but they all die within less than a year and 2 YEARS.

Ok now back to the problem. I had a customer with a similar problem actually with the same model of laptop you have.

The problem was the adapter jack. I had to dissasemble the whole laptop and replace the jack for for a new one ( it cost like 15 $ -20$), the problem for you depends on your experience on computers to do this and then reassamble it again. If you take it to a tech, they could charge you from 80$+ just to try this.

The other problem could be the mobo (motherboard) it could be burned out. If so, then consider buying a new pc; perhaps, you can take the dvd drive, rams, hdd and SCREEN to sell it and get some money back.

Remember this is just a suggestion since i cannot see the problem, we only answer depending on the information you provide Ignore the above post
Quote from: Serune on July 09, 2011, 07:19:57 PM

Hi, before i go any further and please do not feel insulted for this, all HP pc's are crap, they have good prices, and specifications but they all die within less than a year and 2 years.

Apart from one of mine, which has been used daily for six years.

Quote from: Serune on July 09, 2011, 07:19:57 PM

Remember this is just a suggestion since i cannot see the problem, we only answer depending on the information you provide

Is that the royal 'we'

Solve : HP Pavilion PSU or Mobo Dead?

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