Re: 820-1889-A .BRD file options?
it's in russian but it works for me...
pyry
Member
Last Activity: 01-03-2024, 08:27 PM
Joined: 12-23-2015
Location: Zacatecas
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Re: A1229. 820-2132 Board view
here you have it schematic and boardview
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Re: 820-3115 does not turn on but with battery it turns on
I already solved the problem. Thanks for your help anyway, the problem was that Q7035 was somehow defective, even if I changed it once. I had to change it again.
I think C7025 was not discharged because Q7035 was not driving to ground
pin 2 of C7025 and discharged...Last edited by pyry; 06-08-2020, 09:28 AM.Leave a comment:
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820-3115 does not turn on but with battery it turns on
does not turn on,but with battery only it turns on
reviewing the board I found the problem.
The problem is that the CHGR BOOT pin 25 charger circuit is not pulsing as it should.
Q7030, Q7035 has a pulse but very weak
the question is why pin 25 is not boosting?
any of you have had this problem before?:
I already changed the two mosfets Q7030, Q7035 AND U7000
I don't know what to do this problem is beyond my knowledge
Last edited by pyry; 06-07-2020, 06:01 PM. -
Re: Need iMac 27" Boardview - 820-2901-A
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Re: DELL Vorstro 3550 Battery not detected
Friend without a scheme no one will be able to help you because you do not upload the scheme of the motherboard in order to help you
And what teknikbursa refers to is that you check the charger IC the communication inputs and outputs between the charger and the KBC
SCL clock signals and SDA data check them with the oscilloscope
[url]https://translate.google.com/[/url]Re: DELL Vorstro 3550 Battery not de... do not uploadLeave a comment:
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Re: Hp 15 la-a993p ec_on not present
EC-ON is a signal that comes out of the kbc after you press the power button. That's why there is no +3VALW and +5VALW
make sure that the power button status change, reaches the kbc
sorry for my EnglishLeave a comment:
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Re: Dell 3421 motherboard 5J8Y4 does not turn on
friend first check that all the signals are reaching the kbc for example
feed that we already know is fed
pin 99
pin 85
pin 17
pin 73
pin 93 to change from 3.3v 0v and go up to 3.3v when you press the power button
for that you can bypass pin 4 with the two of PWRBT1 for an instant only and at the same time measure the leg of kbc 93 that the change of state is coming to the kbc of the power buttonLeave a comment:
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Re: Dell 3421 motherboard 5J8Y4 does not turn on
que voltajes tienes en el charger pu4005
en los pines
20
6
5
12
16Leave a comment:
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Re: iMac A1419-EMC 2639-820-6478-A lock clear urgently
Here you go...Leave a comment:
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Re: iMac 27 A1419 820-3478-A i need efi bios
okay here you go...Leave a comment:
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Re: LA-9001p black screen
Lcd power circuit
3 volts not 19v I was wrong...Last edited by pyry; 10-20-2018, 09:05 AM.Leave a comment:
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Re: LA-9001p black screen
You have to make the measurements with the lvds cable connected....Leave a comment:
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Re: LA-9001p black screen
Check the JLVDS1 display connector
pin 1 + LEDVDD 19v
pin 7 DISPOFF # 3.3v
pin 8 INVT_PWM 3.3vLeave a comment:
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Re: LA-9001p black screen
Plt_rst means if on pin 13 of the kbc there is 3.3v...Leave a comment:
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Re: Lenovo g50-30 self power up and dark screen
First check with a flashlight the screen has an image
you should see some letters or something like that
if you see something check these signals
LID_SW #, INVT_PWM, DISPOFF # should have 3vLeave a comment:
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Re: Vostro 3560 (LA-8241P, UMA version) runs only on AC
never mind my fault i mean PQ105B it's not doing his jobLeave a comment:
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Re: Vostro 3560 (LA-8241P, UMA version) runs only on AC
first test PC101 is not short and if not
remove PQ103 and test if it turns onLeave a comment:
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Re: Macbook pro 15" no video e fan to max
I would do a reflow to u9600 and check the Q5660Leave a comment:
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