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I removed the UB300, cleaned the pad and reapplied solder, but the pad 91 seems gone. I can't re-apply solder on it. What's the best way to fix that? I assume I will have to solder a tiny wire from pin 2 of DB529 to pin 91 of the new CD3215. But pin42 of JB500 seems a bit more problematic...It...

Hi @2informaticos, I did the measurements for U3100 and U3200, then when I saw the UB300 the cause of the issue became kind of obvious... U3100 U3200 UB300 UB400 {} = XA {} = XB {}=TA {}=TB PP1V8_UPC_{}_LDOD 0.445V 0.445V 0.009V 0.446V PP1V1_UPC_{}_LDO_BMC 0.451V 0.459V 0.45V...

Hi, Sorry for the delay in posting the missing voltages; the idiots at the apple store messed up with the screws heads holding the logic board, I had to find an iron bit to get rid off several heads with a driller -_- Out of the case, with just one pair of Thunderbolt ports plugged on it, the...

Hello, I'm working on a A1990 that does not turn on anymore. Charger is stuck at 5.19V (stable) on each of the 4 USB-C ports, power stays at 0.036A (+/-0.002A). With the battery plugged in, logic board not taken out, I measured: 3.37V on the testpad PP3V3_G3H_RTC_X 7.59V to 12.27 on the...

I suddenly realized that I had ordered 12x MI0805M221R-10 a few month ago, to reach the minimum cart value with a previous order. That's quite fortunate because I was not that motivated by the "wire option". If an engineer put an inductor there, maybe he had a valid reason to do so. I'm not...

Re L8300, I read this post: https://boards.rossmanngroup.com/threads/solved-a1398-820-3662-no-image-after-screen-repair.19968/page-2 Does the current rating max matter ?

Hi 2informaticos, thanks for your swift reply. Do you mean that the difference of 0.1V is not significant and that 10.57V should be considered as equivalent to 10.67V, ie difference is 0 ? Otherwise, 10.57V is smaller than 10.67, and I do not get what is wrong in the assumption :unsure...

Hello, The MBP is able to boot, load the OS, but the screen stays black. If I plug an external monitor, I get an image. The keyboard and trackpad work properly. Measurements on J8300 are: 1.978V on pins 28-29-30. As I get 5.00V on pin 1 of L8300, and 1.978V on pin 2 of L8300 & pins 28-29-30...

J9000 was the culprit. Connector replaced.

R.I.P then :( CPU dead, data lost.... Thanks for your assistance, 2informaticos

Hello, I apologize if this is not the right place to ask, but I didnt find which of the forum section (Macbook Logic Board Repair, Tools, Business talk, Off topic, iPhone, Diet...) was the most relevant for that. I will have to buy a few replacement keyboards (and Touchbar) for A1990 and A2141...

U7100, Pin 41: 12.55V, pin 42: 5.1V pin 48: 0.81V Is it normal to have PPV1V05_S0_CPU to 0.988V?

Good evening 2informaticos, thanks for your help! I do have voltage on L7700, pin 1: 1.81V I do have votage on L8100, pin 1: 1.09V, both side On L8150, pin1: 2.64V, pin2: 0.606V, but, most of the time, it is 1.1V on both side. I would have expected 0.6V considering the boardview but I read 0.606...

Good evening, I have a 820-01958 with water damage. Corrosion was especially present around Q7680 and Q7660. There was also corrosion around CC714 / CC715, CC716, CC717, CC7A0, CC8A1, R7686, R7666, CC760, CC761, CC786, CC787, C7681, CC789, CC788, C7660, C7060, CC784, CC785, R7070, R7071, D7070...

PRAM and SMC reset already tried; BKL_PWM is at 2.500V, measured on C9704 I agree about pins 38-40, i should read the same value on each but most of the time (90%) I don't. I will replace this J9000 tomorrow, and update this post after. Wanted to be sure I didn't miss anything obvious Thanks

I'm working on a 820-3330-B; MacBook Pro does boot, there is a chime, and there is image, but no backlight. I measured voltages on J9000. I do have 3.308V on pins 2&3 I do have 40V on pins 38, always, but 0V on pin 39 (sometimes 30V) and 0V on pin 40. Probably a measurement issue, because 9...

I removed the LVDS connector, cleaned the area and soldered a new one again, but it didn't change anything at first and I had no image. When i turned the logic board on, with a 2011 LCD assembly plugged, fans started spinning full speed, then stabilized at low speed after 20 sec. I had 3.3V on...

Bridge removed ; I now have 3.3V on pin 1/2/3/4/5 of U900, 3.3V on both side of L9000 Now the screen is white-grey, let's say grey. However when I start measuring voltage on pins 4,5...of LVDS connectore, the screen suddenly but occasionnaly turns pure white. Redoing my soldering on these pins...

Yes, editted my post in the meantime regardin pin6; Besides, since I had an image initially but no backlight, I checked my solder joints. It appears I made a bridge between pin 1 and 2/3. I'm therefore sending the3V3 to gound....working on it. Will have a look after on what you mean by missing...

woops... Soldered a new LVDS connector (for A1286 from 2009 to 2011, since display assembly can be swapped I take it for granted that connector are functionnaly compatible, despite small physical differences) Plugged in a 2011 screen. I now get backlight (32.3V on pins 38/39/40). However, I do...