Hi!
As I wrote in my presentation I have a few laptops to be repaired, if possible.
I'm quite a newbie in this topic, so please forgive me if I make some mistakes.
As in title, I have a Packard Bell Tk85 (which has almost the same guts as the aspire 5742 (at least it surely has the same mobo, a Compal PEW71 LA6285P)
which shows the following symptoms: as I press the power button, the blue lights show up, the fan starts spinning, and it tries to read from the HDD. after a few seconds, it shuts down and reboots. Nothing is ever shown on screen, at any time. No backlight nor any kind of image. If powered on from the battery, it continues to reboot as in a cycle, if powered from supply, it usually reboots one time and afterwards it stays on, with black screen. The fan works fine, the temperature sensing circuit seems to work well, it turns on and off the fan as the temperature floats. Another symptom is that it as I turn it down with the button, after a few secontds it boots up again.
Already stripped to the bare board with just ram, cpu, monitor and power button connected, nothing changes. If booted without any ram nothing changes again, no beeps or anything. What might the fault be on the mobo?
Thank you very much and sorry for my bad English!
Davide
As I wrote in my presentation I have a few laptops to be repaired, if possible.
I'm quite a newbie in this topic, so please forgive me if I make some mistakes.
As in title, I have a Packard Bell Tk85 (which has almost the same guts as the aspire 5742 (at least it surely has the same mobo, a Compal PEW71 LA6285P)
which shows the following symptoms: as I press the power button, the blue lights show up, the fan starts spinning, and it tries to read from the HDD. after a few seconds, it shuts down and reboots. Nothing is ever shown on screen, at any time. No backlight nor any kind of image. If powered on from the battery, it continues to reboot as in a cycle, if powered from supply, it usually reboots one time and afterwards it stays on, with black screen. The fan works fine, the temperature sensing circuit seems to work well, it turns on and off the fan as the temperature floats. Another symptom is that it as I turn it down with the button, after a few secontds it boots up again.
Already stripped to the bare board with just ram, cpu, monitor and power button connected, nothing changes. If booted without any ram nothing changes again, no beeps or anything. What might the fault be on the mobo?
Thank you very much and sorry for my bad English!
Davide
... Nobody can help me at least identifying the correct chips?
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