Hi all, a very quick question. Can anyone tell me if buffer ic 3289F can be substituted by 3293F? Thank you!!
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Re: Buffer Ic Substitution
Yes it can, guessing that this is a samsung set ?Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !
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Re: Buffer Ic Substitution
Thank you ReeceyBurger123. Yes it is a samsung. Can they sub 3407f as well? Do you know? ThanksComment
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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 ?Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !
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Re: Buffer Ic Substitution
Yes Ysus needed repair as well. Thanks again!!!Comment
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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.Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !
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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?Comment
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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 afterwardsPlease Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !
https://www.facebook.com/Telford-Tel...7894576335359/Comment
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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.Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !
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Re: Buffer Ic Substitution
ok. thanks again for all your help. I will post backonce I am done.Comment
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All left and right refers to looking from rear of TV (or looking from front with TV upside down)- TV came with vertical bars and no image. Found faulty TVS on left buffer board. Also replaced T-Con (may have damaged the original while hot air removing components, board has slight warp) and have full image but few horizontal lines on the screen. Some of the lines appears to be 2 pixel tall while others are 1 pixel tall.
- Disconnecting left and right buffer board potentially reveals problems on both sides with different signals (unless this T-Con require jumper like Samsung FB_TRDY1&3) Fault
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Problem
This is an LG edge LED lit LCD Display. The LEDs are on the bottom edge of the display. There are 2 bars (left and right) Each bar has many LEDs and a 6 pin connector. Each pin drive several LEDs thus is the highest current flow / heat junction. The weak lead free solder gradually fails with thermal expansion/contraction cycling and increases resistance. PSU will compensate up to a point, then when the current is too high, PSU just shut down the backlight causing a dark display. I have even seen one which the connector just fell off as solder points became completely detached.... -
Hi all,
I'm interested in understanding how a buffer board chip is working. I know there's about 90 outputs per chip to the plasma panel, but I'm more interested to know about the input pins. I guess that some of them are address pins, but I want to know more.
So far I've found nothing at all. I haven't found any datasheet about the various buffer chips, and I haven't found any schematic for the buffer board using them (Y Buffer Board in Samsung's terminology).
Any information will make me happy. It can be from any buffer chip or plasma TV manufacturer.... -
LG42PC3D -UD originally with green lamp but no display or audio.
Owner says was working, then went 'pop'.
All 5V caps bulging. replaced.
All PSU output voltages within spec but -Vy is low on YSUS.
One of three parallel fets between SUS_OUT and SUS_DN is zenering,
eventually shorts DG. Replaced all 3 - -Vy now OK.
Y scan buffer test point does not follow YSUS output below -50V
Note: This unit seems to expect YSUS output to park at -Vy in between
drive signal pattern periods. A replacement drive signal board confirms this....11-18-2021, 11:49 AM -
- Prior owner tried a replacement main board. No difference.
- Samsung 2x red blinking standby LED = panel fault
- Jumpered FB_TRDY_1 (pin 1 CN1300 left. main tcon->left side buffer boards) and FB_TRDY_3 (pin 95 CN1301 right. main tcon->right side buffer boards) This allows testing individual T-Con (on main board) connection to panel on this Samsung. Found fault on left side (viewing from rear of TV)
- Each side has 2 buffer boards, disconnected left side flex between 2 buffer boards. Fault is on the left most board.
- Tape masking eventually isolated to CN1300 pin 15 (CKV4_GOA) Display
Comment