Re: problem with keyboard macbook a1297
ok then by grounding pin 5, which is at 3.4Volt, the macbook turns on correctly and turns off keeping pin 5 grounded. I noticed that by pressing the power button the voltage on pin 5 drops from 3.4V to 1.7V. Is the resistance probably too high? Is it a keyboard problem?
giove
Member
Last Activity: 01-09-2024, 05:22 AM
Joined: 01-31-2018
Location: Italy
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problem with keyboard macbook a1297
Hi, I have a macbook a1297 emc2414 motherboard 820-2914-B with password prompt on startup. I unmounted the bios chip and reprogrammed deleting everything after $SVS from the binary file. After reassembly it boots normally with the operating system. Unfortunately, probably by disassembling the motherboard, the keyboard no longer works.
I have unplugged and plugged the connector several times but nothing to do not even the start button works. To start it I have to disconnect the battery and put the power supply connector. Is it possible that the keyboard broke? do you think replacing it works?... -
Re: PS4 not sync the controller
Update. The ps4 a year ago could not be updated, gave an error code and was taken to assistance. Upon pick up I was told everything was working except the WIFI. Since it suited me I confirmed the repair, but I don't know what they did. This is a necessary explanation.
Now I started the PS4 in safe mode the controller connected with the wire as indicated works and I performed an installation. To my amazement from a moment before the controllers didn't work now after the reinstallation everything works ok (except the WIFI).
I'm keeping...Leave a comment:
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Re: PS4 not sync the controller
Can you help me find these threads?Leave a comment:
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Re: PS4 not sync the controller
I thank you for the answer. Let me ask you a question, If it were a firmware problem it should never work instead sometimes, cold it works and works well!! Where can I find more info on NOR flash?Leave a comment:
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PS4 not sync the controller
hi I have a PS4 model cuh-1216A that does not sync the controllers. Better to say cold sometimes everything works correctly but when I turn it off and on again after a while it no longer synchronizes the controllers. It must be said that the Wifi has not worked for some time and so I proceeded to replace the AW-nb218 chip, unfortunately without solving either problem. Controllers plugged into the USB charge fine and always work in safe mode. can anyone help me to solve? -
Re: Hp 280 g1 mt
the problem was already present before the bios programmingLeave a comment:
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Re: Hp 280 g1 mt
Help me?Leave a comment:
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Re: Hp 280 g1 mt
Yes i reset cmos Bios and try other fans.Leave a comment:
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Hp 280 g1 mt
I have a motherboard of an HP 280 G1 MT. Although the CPU and chassis fans are working properly, the bios indicates error 511 and 512 requiring the F1 key to be pressed to continue. I updated the bios to the last version, but nothing to do. In bios only "Thermal" appears with the indication "N/A" on both fans, without the possibility of excluding them. You can help me? -
Re: Sony with MBX-224 mainboard problem
thanks. What can I check?Leave a comment:
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Re: Sony with MBX-224 mainboard problem
but should the "xVALW" voltages always be present? I noticed that when I plug in the power cord they are present and after about 20 seconds they disappear and when I press the power button they reappear and then disappear after 20 secondsLeave a comment:
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Re: Sony with MBX-224 mainboard problem
I replaced the component but unfortunately does not go. compared to before it stayed on now after 1 second it goes off. the other does not allow me to take measurements ...what can i do?Leave a comment:
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Re: Sony with MBX-224 mainboard problem
so do you confirm that I need to replace pq29AeB 2n7002dw?Leave a comment:
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Re: Sony with MBX-224 mainboard problem
as I indicated the voltages 12V_1 5valw 3valw are present and are respectively 13v, 5v and 3vLeave a comment:
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Re: Sony with MBX-224 mainboard problem
I have indicated them are 0.4 v bothLeave a comment:
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Re: Sony with MBX-224 mainboard problem
hanks for the reply, the 3valw and 5valw voltages are correct 3v and 5v. on the gates of the PQ29A as shown in the picture there are 3.3v while on the gate of PQ27 e PQ47 there are 0.4v.Leave a comment:
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Sony with MBX-224 mainboard problem
hi, i have a problem with the indicated motherboard. the power on led lights up but does nothing. the checks made are missing the + 5vrun and + 3vrun power supplies. precisely the anomaly should be in the part of the circuit indicated. I have inserted the power supplies in green. thanks...Last edited by giove; 09-20-2019, 12:53 AM. -
Re: acer 5742z dead in my hand
a reflow can help?Leave a comment:
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Re: acer 5742z dead in my hand
thank you for replay.
the resistence to ground of PL28 is 100 ohm on both sides and 1ohm across. Yes only PCH heating up when computer is off.Leave a comment:
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