Here s how the memory of the IBM T40 looks

The maximum memory supported depends on how many slots there are, if there are two slots, insert two 1G can support 2G memory.

a,This is not a good match,The main frequency267The Samsung memory dragged the back legs of the 512M one,Because this will cause the 512 one to also run according to the low frequency of 267,It is recommended to replace it with the same memory as the 512 one。

B,The memory of IBM machines is generally Samsung and modern,The word HP on it may represent HP,In this case, the memory is not original,Change to Kingston,Compatibility should be satisfied。

The T40 supports up to 2G

333 RAM can be used.

You can consider buying a single 1g taobao on a lot **400 or so.

512MB** about 155

You can exchange the discount of 256 for a 512 memory of the same model, which is more compatible.

That's not good.

ddr sdram 267（pc2100)ddr sdram 333(2700)

These two memories are not one for speed, and obviously will drag down the faster one!!

IBM's memory has a lot of foundry ones, and mine is modern.

Suggestion: Replace it with the same DDR SDRAM 333, and there is no big problem with the brand, size or something. T40 is a bit old, and Vista may be a bit struggling.

Swap Samsung DDR SDRAM 267(PC2100) 256M for DDR SDRAM 333(2700) 512M and you're good to go! 1G RAM is enough!

Not good, because the frequency of the two memories is not the same, one is 266 and the other is 333. It is easy to cause problems such as instability. That's not IBM's original memory, because the logo on it is HP OEM.

It is recommended to change two Kingston 512MB DDR400, the performance will be much better.

Both RAMs need to be of the same model.

Samsung DDR SDRAM 267

Micron Technology DDR SDRAM 333 is not a big problem.

But preferably the same size as 512 or 256

My IBM stock memory is Mosel's.

I checked it on the Internet and found that it was an OEM in Taiwan.

IBM has a lot of memory that is foundry from manufacturers.

There are no problems with the quality.

So the main thing is to consider compatibility.

My original memory is DDR333, so I added a Kingston DDR333.

So it's recommended that the frequency of the two memories be the same, and the size doesn't matter.

I once looked it up on the Internet, and everyone said that Kingston's memory is compatible with the original IBM factory.

t40/41.

The graphics card became 7500 32m 9600 64m at the beginning, and the serial port in the t30 was missing, although the graphics card changed to the 7500 16m of the t30, !

Generally, a large part of the T40 41 repair machine is as follows (except for human reasons), blue screen after booting, blue screen restart, game screen, blue screen after booting can not enter the system, crash after a while, and so on!

The success rate of making a graphics card is about 72%, and it is often repeated several times to copy the board for a few days, and if it doesn't work, copy the machine again. Don't worry about people taking it until it's okay.

The above fault phenomena are caused by the virtual soldering of the graphics card, because the graphics card is welded on the board, and the pins are crazy and dense, if the virtual soldering is not visible to the naked eye, then how can it be a problem caused by the graphics card? Take a look below.

The way to identify the fault caused by the graphics card is: if the screen is blurred, the external monitor press FN+F7 to switch to an external monitor display, this is the time, if the screen is still blurred, then it must be a problem with the graphics card, if the external monitor is fine, and switch to the laptop screen display or the screen, that is a problem outside the main trigger, such as the screen line. etc., but from the perspective of experience, this situation is relatively rare, most of them are caused by the graphics card, of course, there are individual cases, not one by one examples.

There is another situation,The machine is no problem on the table,Everything is normal,A slight movement or vibration of the machine will appear screen drawing or flashing,Crash phenomenon,This situation is generally a graphics card problem,Only try to change the new board, if the problem is solved, then it must be a virtual soldering problem of the graphics card。

Finally, let's talk about the solution to the t40 41 problem of graphics card virtual soldering:

Needless to say, 100% change the wrench, and the big boss will go, and there are two solutions:

One: Simply change a wrench, generally 7500 32m** is about 1200, which **includes maintenance costs, that is, 1200 to help you change it. Test it well. The warranty is generally three months, and if there is the same problem within three months, you can also get a free warranty.

Two: dead horse as a live horse doctor, the only maintenance method is to remove the graphics card chip from the board through the BGA workbench, and then weld it, the cost is about 550-650, the warranty is also three months, there are not many maintenance companies that can do BGA welding, there are only a few tooling equipment in the whole Zhongguancun, and there are second-hand, no way the equipment is too expensive, the success rate of doing BGA is 50%, that is, half and half, generally experienced maintenance personnel will tell you clearly, In case the board is not saved, there is no way to do it, which will only change the board, of course, if BGA does not do a good job of repair, the company will not charge you, the same warranty is generally three months!

One of its biggest problems is the graphics card. After it is broken, there will be a blurred screen. Or sometimes it can be lit, sometimes it can't.

There is nothing else in common.

It's the graphics card that is most likely to have problems, it's virtual soldering, just add a solder, and the cost is about 150.

IBM ThinkPad T40 parameters.

Key features. The main frequency is from which it is more common.

Motherboard chipset 400MHz FSB;

The standard memory capacity is 512MB

Memory type DDR

Maximum support memory PC2100 DDR; Up to 2GB; 2 sodimm (1 sodimm)

Hard disk optical drive.

Hard disk capacity 40-60GB

HDD Description ATA-100; 12ms Average Seek Time Optical Drive Type Combo.

Design Type: Optical drive built-in.

Optical Drive Description 16x; 160ms average access time.

Graphics: Sound effects.

Graphics chip: ATI Mobility Radeon 7500;Bus interface AGP 4x; maximum color 16777216; maximum resolution 2048x1536; The graphic data width is 64 bits.

The memory type is 32MB

Display screen size inches.

Screen description TFT Max resolution 1024x768 Dimensions Weight.

The laptop weighs 2250g

Dimensions. Network Communications.

Network Card Description 10 100 Ethernet card.

Modem 56k

Red outer infrared port speed 4Mbps

InterfacesOther interfaces: AC adapter, docking port replicator, external display, headphone line out, infrared, microphone, parallel, rj11, rj45, s-videoout, 2

Power supply description. Battery type 6 cell lithium-ion battery life hrs; Charging Time - When Charging When Off: 4hrs Environmental Requirements.

Operating temperature 10; 31

Operating Humidity 8; 80