Re: Macbook pro 2018 15 inch Dead
Here is the latest update. I was able to turn on the laptop but I see lines flickering on the display. I checked also keyboard backlight not working. how I troubleshoot those things?
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Re: Macbook pro 2018 15 inch Dead
Hello. I purchased another logic board from ebay to fix this laptop. but that motherboard also not working. I feel the haptic when I click on the trackpad but no backlights or nothing on screen.
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Re: Macbook Pro a1502 no power
I'm using my original charger. but well damaged. will try to find similar one and test....
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Re: Macbook Pro a1502 no power
both sides on R8179 is 0v. means PM_SLP_S4_L = 0v
PPVRTC_G3H = 3.34v
RTC_RESET_L = 3.34v
PCH_SRTCRST_L = 3.34v
PCH_INTVRMEN_L = was unable to find a testpoint to test Low signal(PCH_INTVRMEN = 3.24v)
PCH_DSWVRMEN_L = can't find a testpoint to test Low(PCH_DSWVRMEN = 3.24v)
SYSCLK_CLK32K_RTCX1 = don't have an oscilloscope.
PP3V3_S5 = 3.34v
PM_DSW_PWRGD = 3.44v
PP3V3_SUS = 3.35v
PM_BATLOW_L = 0.03v
PM_RSMRST_L = 3.31v
PM_PWRBTN_L = 3.43v (batteries...
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Re: Macbook Pro a1502 no power
When I read this article, I guess I must find another magsafe charger before make a decision. I can see batteries are getting fat. (but I can see 12.57v using batteries as well)
what do you think? is that enough voltages I mentioned above replies to move forward or do I need to find another AC adapter???...
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Re: Macbook Pro a1502 no power
c7505 pin 1 --------> 5.03v
u6100 pin 8 ---------> 3.35v
u1950 pin 8 ---------> 3.44v
l7520 --------> 0v...
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Re: Macbook Pro a1502 no power
green light appears for few seconds and turn into orange. sometimes I can't see any light. (this can be charger issue. I had this issue for last few months)
I can't see corrosion anywhere.
No 5v pulse at L7520. will check other voltages and post soon....
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Macbook Pro a1502 no power
Laptop worked perfectly without any issue. suddenly it got stuck and died. I have no idea about the issue. I tried to troubleshoot the issue and I found below things.
I can see 16.57v from magsafe adapter.
I see 12.6v on L7130
also 3.3v on L7560
I can't see 5v. I guess thats the issue. but I can't see any short to ground on that coil. (tested at L7520)
I guess 5v enable signals are missing. please help me to troubleshoot this.
Here I attach the diagrams and brd files I used....
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Re: HP elitebook 820 G4 LVDS not working
Here what I noticed,
When I turn on laptop using external monitor I see bios there. but nothing on LCD. after I see bios, I removed VGA cable. then I was able to see LCD backlit there. but no images. Without External monitor, Nothing appears even backlit.
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HP elitebook 820 G4 LVDS not working
Motherboard: 6050A2854201-MB-A01
Hello. I purchased this laptop from ebay. Laptop turns on and also POST with external monitor. but nothing on inbuilt display.
Motherboard takes only 0.3A.
I tried to find schematics and I failed. So I need help.
what should I do.
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Re: Macbook pro 2018 15 inch Dead
I purchased this laptop for 370$. full set with box. Im trying to find a dead logic board and replace. if I failed I should sell other parts to cover the cost. Thats the only hope I have.
Thats the main lesson I learned. small mistake but expensive.
I totally agree with you....
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Re: Macbook pro 2018 15 inch Dead
mm. I was afraid about the other components. so I used lower temperature. anyway I will try to find another logicboard to fix this stuff. lets see.
Thanks for the support...
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Re: Macbook pro 2018 15 inch Dead
Finally I fucked up everything. When I remove defective NAND chip some pads on the the board damaged. Completely my mistake. anyhow I canceled the order from alibaba because its useless to order chips now.
unexpected experience to me. I learned something.
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Re: Macbook pro 2018 15 inch Dead
Hello piernov,
I will test ssd rails. anyhow the seller said that the chip has installed right program.
Sounds like they have programmed. will look into power rails. Someone has tried to remove the logicboard and some screws are damaged. need to find a way to remove them....
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Re: Macbook pro 2018 15 inch Dead
Seems Like I can fix this.
here is the link I found from alibaba and ordered it today.
[url]https://m.alibaba.com/product/1600470338762/Tested-High-Quality-128gb-256gb-500gb.html[/url]
I contacted them and they told me that chips are programmed.Re: Macbook pro 2018 15 inch Dead<br...0gb.html[/url]...
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Re: Macbook pro 2018 15 inch Dead
Thank you so much for the reply mon2. I tried to find nand from donor board and I was able to find programmed Nand chip for the same model from Aliexpress. My question is,
Should I replace NAND before further tests??
I tested roughly, laptop take 20v from the charger and 5v and 3v are present. also I see 1.8v present near ssd chip.
Anyhow I will order the chips today. lets see...
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