exxos's Atari, Amiga & retro forum

i'm not good at unsoldering, how do i go about removing an ic when all pins have solder removed, seems harder than i thought, just won't come out. i suspect i need to heat all pins up at same time :(

dave

Easy with a proper desoldering station..

alienkidmj12 wrote: 05 Aug 2021 21:18 i'm not good at unsoldering, how do i go about removing an ic when all pins have solder removed, seems harder than i thought, just won't come out. i suspect i need to heat all pins up at same time :(

There are a few ways to desolder chips and get them out easily. My preferred method is a desolder gun but there are other methods such as a hot air gun and others. These old boards are sometimes difficult to desolder even with the methods mentioned it sometimes needs a helping hand levering the chips as they are heated up. I have managed it with a handheld pump desolder tool and a soldering iron and a bit of leverage but it takes a while gently easing the chip out.

Also sometimes resoldering with fresh solder helps in making the solder flow better when you come to remove it.

i have hot air station, but cant get it to switch on, the soldering bit works fine, weirdly.

Often solder get stuck on the top side very easily on the ground and sometimes on VCC pins. Pump away the old solder as much as you can. Add new solder as mention previously by others and pump that out. Crank up the heat a bit on GND and VCC to get the solder to melt on top as well. Wiggle the pins loose from the bottom if they are a little stuck. Then wiggle the whole chip from the top. You can also braid from the top and bottom.

i used braid, the solder is all gone, im trying to remove the shifter chip, but the metal cage doesnt help, tried removing the cage, its a nightmare to get off lol. obviously theres something keeping it in the pcb, ill try again tommorow.

Some progress...........

First, further paint job



Secondly, remove shifter and dma from older donor board

https://www.youtube.com/watch?v=lp9VNblNdvo


Fitting to board.



Whats left..


2 Acia Chips MC6850P - To Unsolder or buy new faster ones
Cart Port
MC68901P (The one on donor board is wrong size :( )
Fit midi instrument card

question is, for the h5 board,

do i need

TOS206 ST DECODER BOARD REV1.4

or

16MHz ST BOOSTER REV 1.4 £65 OUT OF STOCK (also has decoder )

anyone know ?

Mounted the Dream Blaster X2GS

alienkidmj12 wrote: 08 Aug 2021 15:37 question is, for the h5 board,

do i need

TOS206 ST DECODER BOARD REV1.4

or

16MHz ST BOOSTER REV 1.4 £65 OUT OF STOCK (also has decoder )

anyone know ?

If you want to run TOS v2.06 or any 256K ROM (EmuTOS for example) you need a decoder board.

But if you just want to get the board up and running with TOS v1.04 it is not needed.

But I think Trudie has decoder on it.