Hoping someone can give me some advice, i ve been using a hot air station for a few years now, no issues soldering ic's,mosfets,transistors. Im going to be soldering a surface mount 48 pin chip to a main board for a repair. Ive been practicing on faulty boards and cant seem to get the solder to flow to each individual pin without clumping the pins together. Im using low temp solder paste, rosin solder flux, and about 400 degrees F. Each time I attempt this most of the legs get soldered individualy but there is always a few that clump or get a puddle effect, and I have to use the copper to separate them.. The videos on youtube make it look effortless with the required tools. What am I doing wrong?
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Re: 48 pin Chip, hot air station soldering, what am I doing wrong?
i flood the chip with solder and flux and use hot air to remove, then use iron to solder in place, run solder with the iron down the sides of the chip useing flux, and then use 5mm braid to remove the non wanted solder from between the pins/legs, and i use a USB microscope to check -
Re: 48 pin Chip, hot air station soldering, what am I doing wrong?
To resolder
Plenty of flux
brigde 2 pins on each side.
and then drag solder
takes less than a min.Comment
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Re: 48 pin Chip, hot air station soldering, what am I doing wrong?
Look here https://www.youtube.com/watch?v=wUyetZ5RtPsComment
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This is a guide that I am writing for helping others to replace their MEC1503 EC chip if it breaks (or to get around an inconvenient prompt to the BIOS). This forum has been extremely helpful to me so I would like to contribute to help others. I will tell you right now that this task is very difficult to do. You MUST have experience and tools to do precision micro-soldering, BGA reballing, trace repair, and general laptop repair skills.
There are some specialty tools needed to do this task. The replacement MEC1503 chips can be acquired from Aliexpress. Do not buy the bare chips as... -
Hi everyone,
I have an HP Elitebook 840 G5 that I am trying to get working again. I've removed the front bios chip (the 32mb one) and have run it through HP unlocker already. I've uploaded and verified the new bin, but am now experiencing an issue that has led me to believe I've been soldering the chip back to the motherboard incorrectly.
Essentially, after re-soldering the chip back into its place and reassembling the laptop, the charging light immediately flashes orange and white and then shifts to a solid white. The capslock and numlock lights blink seven times... -
Long story short:
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(seems like the story was not that short)
He used alligator clips to read the chip. No luck reading it. Removed chip and placed on a SOC-8... -
Hi
I have a very strange issue with the BIOS SPI chip of an ASRock B650M PRO RS motherboard.
The SPI chip is an Winbond 25Q256JWEQ model (1V8).
The motherbaord doas not POST - it lits only CPU and DRAM EZ Debug Leds, and stays that way forever.
The Flashback function of the motherbaord is also not working, despite all instructions followed correctly - I'm 100% sure of this.
I have then desoldered the chip, backupped the contents, and tried to earease the chip in order to program stock image, but the chip is locked by status registers SREG2 (TB) and SREG6... -
Hello everyone.
I have come here with a rather specific question. I was given a Dell Latitude 7420 laptop with a busted screen, and wanted to see if I could refurbish it into my daily driver. I wanted to experiment and see if a 2-in-1 display would work as the chassis of the laptop and 2-in-1 7420 looked identical. I threw in the display and my hypothesis was correct, however, I was greeted with a locked BIOS and since I didn't know the password, I figured I'd try to unlock it somehow. I bought one of those POGO pin probe things for my CH341A programmer so I could read and make...
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