Hi, I've been messing with this on and off for a while. The original problem was although the power LED's lit up, the rest remained dead. After finding a schematic online I discovered the CPU VCORE voltage was very low, most times non-existent but occasionally it would come up to 0.7V. The CPU remained cold. After some component checks in the VCORE supply I plumped for the tiny i.c. controller, a 40 pin SMD. I picked one up cheap and now I have replaced it I have a working supply, it ramps up to boot voltage (approx 1V) but does not POST. The CPU is now getting warm as it should. Unfortunately this model does not give an audible beep (I have an identical one that works). I have a cheap POST tester which is cycling, indicating continuous resets. I have tested the add-on parts by substitution in the working laptop, the CPU, RAM and graphics daughter board are working.
Now it's tricky, I don't have any good way of checking which area is causing the reset to be cycled. All voltages are present and correct. The POST card is useful-ish but the codes dont mean anything to me. All I know is that if I remove the RAM from the working board and the faulty board, both give the same code, indicating that up to this point everything is good. I don't know the rest of the sequence from here on, I think it's something prior to the graphics card being initialised which is giving an error and cycling the reset (wish it would beep at me).
I am only messing with this as it's not in the best condition. I don't have a clue on it's history to try and deduce the events that led up to it's failure. It does have a dodgy DC jack though. The battery is worn out too. It's more of an experiment. It certainly doesn't justify spending on a motherboard.
I'd like to see if I can get this going out of curiosity. If all else fails I have a good 15.4 inch LCD panel I may be able to re-use.
Just posting to see if there are any known failures or tests I can do to further narrow the problem down. I've not touched it for a while but may revisit it at some stage.
Now it's tricky, I don't have any good way of checking which area is causing the reset to be cycled. All voltages are present and correct. The POST card is useful-ish but the codes dont mean anything to me. All I know is that if I remove the RAM from the working board and the faulty board, both give the same code, indicating that up to this point everything is good. I don't know the rest of the sequence from here on, I think it's something prior to the graphics card being initialised which is giving an error and cycling the reset (wish it would beep at me).
I am only messing with this as it's not in the best condition. I don't have a clue on it's history to try and deduce the events that led up to it's failure. It does have a dodgy DC jack though. The battery is worn out too. It's more of an experiment. It certainly doesn't justify spending on a motherboard.
I'd like to see if I can get this going out of curiosity. If all else fails I have a good 15.4 inch LCD panel I may be able to re-use.
Just posting to see if there are any known failures or tests I can do to further narrow the problem down. I've not touched it for a while but may revisit it at some stage.
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