Select Page

BLOG

Louis Rossmann’s rants, tips, and ideas on the laptop repair industry.

Our store’s location

No appointment is necessary - come by during our open hours and we are happy to help you! The Rossmann Group – Manhattan186 1st Avenue New York, NY 10009 (347) 552-2258 Monday-Friday – 12 PM to 8 PM Saturday-Sunday 12 PM to 4 PM  

Macbook Pro Retina water spill no video repair

This Macbook Pro retina logic board has no output on the internal screen. However, using a displayport to VGA adapter, I was able to get a picture to show upon an external monitor, and I was able to run ASD. ASD gave me an error, displayport symbol error. I...

Macbook logic board repair, short detection

Here I go over how we troubleshoot a short to ground on PPBUS_G3H, a main power line on the Macbook Air logic board. Here we have an issue where the CPU vcore circuitry. Many people use the word "short circuit" to describe any type of non-functioning circuit, whether...

Amtech NC-559-V2-TF flux for sale!

In most of my motherboard repair videos, the flux I am using is Amtech NC-559-V2-TF. A lot of people have asked what flux I am using because it makes the job so much easier. Even if I tell you what it is, I have not done the hard part of your job in locating Amtech...

What is error 53?

Error 53 is something often discussed online, without much information. Some think it is just an issue when you change the home button on an iPhone 6 or 6+. It isn't. You can get error 53'd even with the original home button. Error 53 is Apple's way of monopolizing...

Common onewire circuit ailment on older Macbook Pro logic boards.

https://www.youtube.com/watch?v=sI7rvFLUzH0 One of the common issues is that liquid gets in along the vent and touches the board since there is no protection, and there are components along the vent that are very important. The onewire circuit is what allows the...

What is a voltage divider?

A voltage divider is a series of two resistors one can use to lower an input voltage to your desired voltage. Let's take the BKL_EN circuit, for example. Many circuits inside of a laptop don't come on until they see voltage at their enable pin – think of the enable...

Explanation of PP3V42_G3H power line on Macbook Pro logic board

In the past blog, I discussed the onewire circuit. Here I'd like to talk about a specific power rail, that powers the onewire circuit, and its importance.   The PP3V42_G3H power rail is one of many power rails on a Macbook Pro logic board. ignore the confusing...

The onewire circuit’s importance to Macbook logic board repair.

If the onewire circuit does not work, the charger will only output limited power to the board, and nothing will work off of the charger. The onewire circuit depends on proper function of the battery charger chip, the SMC, and the two ICs that are utilized in the...

BGA rework video using ZM-R6200C for Macbook logic board repair

Not relevant much anymore since Apple is covering these failed GPUs for free, but I figure it may be of interest to some how the work is performed. Here you'll see me remove the old chip, prepare the board for a new chip, and install the new chip. This process is a...

WE CAN FIX YOUR PROBLEM