leovalpo
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Last Activity: Today, 05:24 PM
Joined: 05-20-2014
Location: valpo
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This is used to evaluate and repair version 6...
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Check readings with multimeter in ground resistance mode (diode position) of:
PUB1 (pins 1, 2, 25, 32).
PJF3.
PU301
PJ302
PJP301
PL302
All of the above is done without having the charger or the battery connected (board de-energized).
Post the readings.Leave a comment:
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It is a protection diode, you should leave it installed to avoid future failures due to potential differences generated in that circuit.
600 W unidirectional Transient Voltage Suppressor (TVS) in a SOD128 small and flat lead
Surface-Mounted Device (SMD) plastic package, designed for transient overvoltage
protection....Leave a comment:
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You should try another power source.
Any experienced technician knows that these are not eternal and if the equipment has been operating with the original PSU for more than 5 years, it is very likely that it is the source of malfunctions, even more so if the iMac comes with a discrete configuration.
I bet iMac fails due to lack of power (typical failure).
Getting your hands on the motherboard is the last resort, if you don't know what you are doing, the motherboard can be completely unrecoverable.
If you are going to handle the inside of the iMac, wear thick rubber gloves,...Leave a comment:
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Can you indicate the motherboard number?
820-01041-A or 820-01814-A?...Leave a comment:
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You may need to perform tests using a different power source than the original one as the failure may be related to that part.
Replace the power supply and it should work...Leave a comment:
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You can do these tests:
1. Turn on the iMac and press and hold the D key to start diagnostic mode, if it does not load, turn off the iMac.
2. Press and hold the shift key (⇧) to boot into safe mode, if it doesn't work, turn off the iMac.
3. With the IMac turned off, hold down Command (⌘) + R, press and release the power button, and continue holding Command (⌘) + R until the macOS built-in recovery system appears.
4. If you can access the macOS recovery system, locate the Utilities menu in the top bar and click on Terminal in the submenu....Leave a comment:
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Re: Nitro 5 AN515-51 - Burned KBC and regulator - LA-911P
La nomenclatura “+3VLP” en un diagrama esquemático se refiere a una fuente de alimentación de 3.3 voltios. El sufijo “LP” indica que la fuente de alimentación es de baja potencia (Low Power).
Mirando el esquema, esta señal es un voltaje que se crea para probar la corriente y (para este caso) alimentar el SIO (EC) y encenderlo.
El problema entonces, es que no se está superando esa prueba, por ende el SIO (EC) no se encenderá.
Es muy posible que el SIO (EC) esté con una falla...Leave a comment:
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Re: First reset signal on computer, how to work !
Hello, interesting guide. Thanks for your time.
As for it, what do you mean when you say high? I understand that low refers to a voltage, for example 3.3V of +3VS...
When you say high, do you mean that there should not be a voltage or that it should exceed what is understood as a normal value? Excuse my ignorance, I'm just trying to understand your guide. Thanks again :chulo:...Leave a comment:
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Re: 820-3115 no post
measure the ground resistance of the rails (red probe of the multimeter grounded to ground and the common probe reads the component), in the list attached as an image is the voltage reference value....Leave a comment:
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Re: Huawei Matebook Schematics and Board View Files
Hello, thanks for sharing.
Do you have any schematic for HUAWEI MateBook D 14 AMD model NBLK-WAX9X? Or information on how to disable integrated ram.
This one has a fault in the ram memory modules, I don't know which one, it comes with 8GB Hynix, according to the BIOS there are 2 dimms of 4GB ddr4, I would like to be able to do some tests with dash-enabled to see if it is possible to recover this laptop.
I thank you for your answer.
Greetings...Leave a comment:
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Re: MacBook Pro 820-3115 G3H missing
[url]https://www.youtube.com/watch?v=dIuEYPOHlEU&t=1207s[/url]Re: MacBook Pro 820-3115 G3H missing...&t=1207s[/url]Leave a comment:
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