jma46
Member
Last Activity: 11-02-2024, 04:34 AM
Joined: 05-01-2020
Location: North Yorkshire
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Almost the same with fuses removed, sometimes goes up to 20v sometimes 14v - 16v ? 96w charger etc? -
Yes I have one, but nothing heating up
F7001 pin 1 4.59v 16v and drops pin 2 4.5v 5.1v and drops
F7000 pin 1 4.59v - 17v and drops pin 2 4.59v -16v and drops
Both constantly fluctuating and not stable
F7001 pin 1 1.3Kh and dropping slow pin 2 1.168 Kh
F7000 pin 1 1.062kh pin 2 1.129kh
Dia mode F7001 / F7000 .430 both sides both fusesLeave a comment:
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Removed R6907 and now sometimes reaching 20v but not stable and still rebooting 5v 14v 20v? Suspecting U7000Leave a comment:
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A1707 820 281 jumps from 5v -16v on amp meter then restarts
Hi sorry to Hijack this thread, I have an A1707 820 281 which jumps from 5v -16v on amp meter then restarts, I have checked big coils for shorts, ppbus and all seems ok. Im thinking there is a short which is causing it to reboot but I'm out of ideas? Also another A1707 where the internal SSD is not showing in terminal or disk utility? No excessive heat from SSD chips?
Thanks in advance for any suggestions... -
Thanks for your response Mon2, I will give that a go and see if the voltage lowersLeave a comment:
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PP3V3_G3H = 4.472v?Leave a comment:
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Hi Mon2 sorry I didn't get back to you straight away, I removed R7000 and R7001 and the voltage jumped to 20v! checked again for shorts on the upstream side and nothing, then before I had chance to do anything all 4 CD3215's back to 5v? I have since replaced ISL, D6902 & U6903 and have 2 of the CD3215 kind of cycling and 2 at 0amp draw. Also PM_EN_P3V3_G3H is 5.06v?...Leave a comment:
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820-00281
Sorry to hijack this thread, I have the same board with a similar problem. First one of the CD3215's was dead, no voltage on USB meter. Replaced faulty CD3215 and now get 5v climbs quickly to 12v around 200ma then loops back to 5v then loops at 5v most of time. Very low PPBUS ma reading but pp3v3_g3h present. I have replaced ISL and diode which takes battery and PC DIN. It seems there is a short before machine fully boots but struggling what to look at next. Hoping CPU not fried, I have replaced 2 cracked tantalum capacitors which were cracked ( think this was the cause originally ) no water damage,... -
Hi Mon2 yes caps lock toggles, backlight ok but no image, is it either flexgate on the data cable or something else?...Leave a comment:
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Hi, I have a similar problem, the board I have responds to pram reset, the mouse pad feels like its working, the backlight is on but no image? I replaced one of the CPU mosfets which was getting hot, ramps to 20v .8 ma draw then settles around .35ma. Wont boot with touchbar connected, doesnt draw any amps, but seems to be booting unplugged.
Sorry just to add, Caps lock lights up, my next step is to connect speakers and see if it chimes and also any usb activityLeave a comment:
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Hi has repair wiki disappeared? I had it saved as a tab but nothing there?Leave a comment:
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Thanks Piernov that's great, hopefully that will help me out
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A1990 820 1326 board view and schematic
Hi I have searched Google and found nothing, the board is listed on repair wiki but never came across this number before, anyone have any ideas? is this the same as the 1041?
thanks Joel -
Hi all, this is a great site with vey helpful people and brilliant information, I am fairly new into board repairs, but I am definitely hooked!
I started my hobby replacing phone screens for friends etc and then moved onto trying to repair a faulty MacBook. I have had some successes and some failures but ultimately I love trying to solve the problems. I am ok with the simpler faults but still learning how to go about the more difficult repairs and how to determine if a board is dead! I have a few A1708 820 840 boards which I have to the side which a return to and try and diagnose...Last edited by jma46; 12-06-2023, 03:19 PM. -
Re: A1990 MacBook Pro Burned via repair
Thanks for the advice I will try the wire spiral method with solder mask. Any recommendations for decent solder mask? the stuff I have does harden but needs a good 5 minutes with the uv light even with a thin coating.Leave a comment:
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Re: A1990 MacBook Pro Burned via repair
Ok thanks for your advice I will try again when new tip arrivesLeave a comment:
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Re: Burned via repair
Yes I have a set of those but the problem is the remains of the via are below the level of the board, kind of in a hole, not sure by scraping around the edges I will damage other traces and layers. It seems almost impossible to get a solder blob to connect! Ive just ordered a t30 tip for my Hakko which I am hoping will workLeave a comment:
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A1990 MacBook Pro Burned via repair
Hi I have been replacing a Touch Bar connector as the laptop had suffered liquid damage and some on the contacts have burned (A1990 MacBook Pro). Some on the connection points have disappeared (burned away) all that is left is a tiny dot to solder too. Also have another similar damaged via on the PP5V_3GS rail which is linked to a lot of rails on this board. Again there is a tiny dot which I think is the via to attach too, can these be repaired and built back up to a pad? Is it wise to dig down carefully in the layers to get a good solder connection and build back up with solder paste? just wondering... -
A1466 820-00165
Hi al,
I recently sold an A1466 to a guy and after a week of use the battery started to fail. I told him to return it and gave him a refund. Once I got the laptop back I realised that a password had been setup and the guy had locked himself out also. Anyway I tried everything I could and ended up buying an EZP2019 programmer to clear the password and make the laptop useable again. After desoldering the chip and reading on the programmer, it is saying that the chip is empty? Just wondering if anyone has a clean dump for 820-165? I am presuming I could write it back to the chip and everything... -
Re: MacBook Pro 15" A1707 820-00281 repair
Thanks Mon2, that's brilliant Ill get some ordered, I have tried all sorts of searches but don't fully understand what the part is, but glad you do!
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