La-4111p Rev 1.0 Schematic

[Silvana Fleischacker]

HPCompaq Presario CQ40 Compal LA-4111P JBL20 Rev:0.2 AMD UMA schematic diagram.We are believing in reviving the technology and making minimum electronics waste, as our field is computers and laptops we are here trying to provide as much stuff as possible for free to make our contribution. At this platform you can download schematics diagram and other relative material to make it possible to repair.

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So. I have this laptop pavilion dv4 1225dx and when I turn it on, fan spins for a few seconds then turns off. I can hear the HD on, and the power led is also on, but nothing nothing on screen. I tried changing the Memory and reseting the bios, nothing changed. Can anyone help?

You would have to find the schematic for the motherboard and start testing. Initially it would be the power circuits but since it doesn't appear to be passing POST i.e. no display and the fan turns off, it may also be a firmware problem.

Thank you very much for answering. After some more investigating i figured out that the laptop was actually on the whole time, despite the fan turning off.. (it comes back on after a while). So looked more closely and I notice that when I turn it on the screen blinks very slightly, and a white stripe almost unnoticeable apears somewhere on the screen. That plus the fact that nothing appears on the external monitor gives me a very strong indication that the problem is on the BGA.

As you can see a lot passes through it to the CPU from the chipset ATI SB700. (see p.12/55 and 13/55 to see the "memory" connections to the GPU/shared memory chip) Whilst it may be just some pins affecting just the graphics I'm not so sure.

I suppose that you could make sure that the "video" voltage supplies to the chip are OK i.e. +3VS, +1.8VS, +1.1VS by measuring them at a convenient component as marked on the circuit. You won't be able to measure them on the chip itself, that's for sure. Just don't slip with the voltmeter's test probes and bridge between two components etc as this will only compound the problem.

Some must be OK as the GPU is checked during POST (Power On Self Test) By that I mean that the BIOS and CPU communicate with each other and the GPU, memory etc before the laptop boots into the OS to make sure that they're all OK and working. This doesn't mean that the display will work just that the GPU can communicate. If it couldn't then the POST would be halted and LED error codes (Caps Lock, Number Lock, Power button, LED blink pattern) would be produced as to what the problem is.

It may be the chip but it is not easy to replace. I've never bothered as usually it is not worth it especially if the systemboard is old and under resourced anyway for today's software requirements. If you want to keep the laptop it is much simpler to get a replacement motherboard as finding board level problems can take a very long time if you're not familiar with that particular board.

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