Buffer Ic Substitution

[simplytrini]

Hi all, a very quick question. Can anyone tell me if buffer ic 3289F can be substituted by 3293F? Thank you!!

[ReeceyBurger123]

Re: Buffer Ic Substitution

Yes it can, guessing that this is a samsung set ?

[simplytrini]

Re: Buffer Ic Substitution

Thank you ReeceyBurger123. Yes it is a samsung. Can they sub 3407f as well? Do you know? Thanks

[ReeceyBurger123]

Re: Buffer Ic Substitution

No worries and yes most of the 3xxxf ics are interchangeable with no visible affects. Also you might need to repair the Ysus have you done so ?

[simplytrini]

Re: Buffer Ic Substitution

Yes Ysus needed repair as well. Thanks again!!!

[ReeceyBurger123]

Re: Buffer Ic Substitution

No worries common issue is Ymain kills the buffer, are you replacing the Ic yourself ?
I have replaced a scan Ic before its not easy tbh as long as you use a good method.

[simplytrini]

Re: Buffer Ic Substitution

Yes I am going to replace myself. I have a reflow station that i will use. Do you suggest anything specific from you experience?

[ReeceyBurger123]

Re: Buffer Ic Substitution

Here is what I suggest:
Clean off all pins with solder wick and heatsink pad before doing anything then wash with Ipa
Apply solder to the heatsink pad under the Ic
Apply flux to the solder pad
Place Ic on top of solder pad
Heat area until molten, the Ic should fall into place as the solder from the pad will take to the ic, then lower heat slowly until off, and make sure that Ic is positioned properly
Apply flux to all pins around Ic
Apply solder on all pins don't drag it out !
Apply more flux to pins
Use flux based solder wick and wick up the large amount of solder around Ic, until you can see that pins are connect to the pcb but not shorted. You will need a lot of flux for this !
Clean with Ipa afterwards

[ReeceyBurger123]

Re: Buffer Ic Substitution

Its hard to preform and you will need decent Smd skills, you can not hot air or heat plate the Ic into place you need to solder it with an iron.

[simplytrini]

Re: Buffer Ic Substitution

ok. thanks again for all your help. I will post backonce I am done.