No use measuring resistances with power applied to the board.
Have you removed the new wireless chip ? Can you post pics from that area?
rogfanther
Badcaps Veteran
Last Activity: Yesterday, 04:03 PM
Joined: 07-15-2006
Location: Curitiba
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Is the charger you are using the original one from the machine ?Leave a comment:
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No. If you solder past the jack, without removing it, the short will still be there, and my affect your reading.
Measure the resistance to GND of the jack and mosfets, and post the results here.Leave a comment:
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Ops, sorry. Yes , meant resistance to ground.Leave a comment:
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Just a veeery long shot, but isn´t this one of those boards that have a tiny switch inside the power jack, that is activated when the psu cable is inserted ? Can you try with a psu, even disconnected from mains, and see if the voltages change ?Leave a comment:
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Measure the coils of the Vcore supply. Any short ?
If not, and only 0V, check the IC responsible for this rail. Which is it, and does it have the correct voltage on its VCC pin ?Leave a comment:
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Since the board needs to be removed to install the SSD, review the cables and connectors. It is possible some was connected in the wrong place when reassembling the machine.Leave a comment:
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The question for reading the bios chip was to check if the flash operation was successfull, or if some problem could have happened during flashing and corrupt data was written.
Also, can you post clear pictures of the bios chip area?
Those voltage measurements are with the extra memory stick removed, yes ?Leave a comment:
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Post pics of the entire board. If the cap is not on a place where its ESR is too important, that smaller version could be OK.
Is this display a LED or CCFL one ? If it uses CCFLs, try testing with a spare lamp, to identify if some of the original ones are going bad.Leave a comment:
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Just to check something : read again the bios chip, and compare what is read with the original file that you wrote in it earlier. Compare with the operating system tools ( fc /b in windows, for example ). Also, check chip orientation and the solder on the board.Leave a comment:
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The chinese datasheet seems a bit more complete than the english one. But the communication seem to be in SPI, not the serial kind you would use baudrates with. Note on the datasheet, the pins of the UC can have many functions.
Look at the tables of commands for the led driver chipLeave a comment:
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And that becomes a problem. The stiffeness of the cable makes the things inside of the wall boxes to be tensioned like a spring. Even with Cat6, after some time bad contacts start forming due to this "tension". Worse yet when you need to install two RJ45 jacks on the same 2x4 plate... But people hear that they should "use Cat6 because it is better ... ", ...Leave a comment:
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Even a simple logic analyzer ( those cheap things from eastern origins ) will help you. And yes, their software ( Saleae, Sigrok, etc, will allow to save the data read to the computer for posterior processing ) .Leave a comment:
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Manufacturer´s serial number. It should match what is written in the package.Leave a comment:
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Componentes marked with @ on the schematic are "Do not install". These came from the factory already not fitted in the board.Leave a comment:
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Have you measured or removed the PWM, to see if it is not shorted ?Leave a comment:
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Inspect and clean the area around the keyboard connector on the motherboard. Then test again. Also, check the part numbers to see if the new keyboard is really compatible.Leave a comment:
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You should have power, ground, RPM sensor and pwm to control fan rotation. See from the fan part number if you can identify its pinouts.
When connecting the external power supply to the fan pins, what is the rpm measured by bios ?Leave a comment:
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Clean the keyboard connector, identify the pins that correspond to the power button.
Then try booting the machiine by shorting these pins, without the keyboard connected, and with an usb keyboard.
Also, give a good wash with alcohol on the region around the keyboard connector pins.Leave a comment:
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These measurements are with the suspect PQ12 soldered on the board, right ?
Please, set the meter in Ohms ( about two positions turning clockwise on your meter ) and measure
source to drain
source to gate
gate to drain
as pointed by mon2 above.Leave a comment:
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