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#1 |
Badcaps Veteran
Join Date: Apr 2013
City & State: cheshire
My Country: uk
I'm a: Knowledge Seeker
Posts: 350
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![]() recently struggled to remove BL0202 backlight chip
which had red residue of glue underneath as well as annoying laquer over the top and surrounding area. i had to use more heat than i like to remove it which can cause bubbling of the bcb i used two different types of flux,but it was the glue causing the problem . just wondered if anyone has had this problem ,and if there is any solvent that may loosen the glue before desoldering? (some vestel fets are also glued the same way) this was on a LG47 LB585V, I had replaced the led strips which were badly discoloured only to find q806 mdhd 4n20y s/c r840 burnt and bl0202b s/c |
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#2 |
Leaking Member
Join Date: Dec 2014
City & State: Atlantic Canada
My Country: Canada
Line Voltage: Ground, 0Hz
I'm a: Hobbyist Tech
Posts: 5,052
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![]() Cut the legs of with a knife, remove the chip, then desolder the rest of the legs on the pads.
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#3 |
Badcaps Veteran
Join Date: Apr 2013
City & State: cheshire
My Country: uk
I'm a: Knowledge Seeker
Posts: 350
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![]() thanks at least someone reads my posts
thats a good idea but when salvaging a chip from a scrap board obvious wont work so any thaughts on solvent to loosen the bond ? this repair has caused me grief as the availibility of MDHT4N20Y fet i could order from china but waiting 2 months is the problem even the chip BL0202B are scarce in uk |
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#4 |
Badcaps Veteran
Join Date: Feb 2014
City & State: Midlands
My Country: England
I'm a: Professional Tech
Posts: 6,000
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![]() Plenty of people read the posts, photos always help get a response.
I'm guessing the red glue is adhesive not underfil so a bit of heat and one of the BGA blades to cut it. I'm not sure where you're ordering from but my stuff takes around 2 weeks from Aliexpress. |
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#5 |
Great Sage 齊天大聖
Join Date: Dec 2009
City & State: Europe
My Country: some shithole run by Israeli agents
I'm a: Professional Tech
Posts: 26,417
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![]() philips use the red glue, you just heat the chip with hot air till the solder melts - then twist it with tweezers and the glue breaks.
it's weakened by the heat |
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#6 | |
Badcaps Veteran
Join Date: Apr 2013
City & State: cheshire
My Country: uk
I'm a: Knowledge Seeker
Posts: 350
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![]() Quote:
i had to turn up to max to budge it which is not good for the pcb |
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#7 | |
Badcaps Veteran
Join Date: Apr 2013
City & State: cheshire
My Country: uk
I'm a: Knowledge Seeker
Posts: 350
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![]() Quote:
aliexpress varies so much with del times and quality of product is sometimes poor |
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#8 | |
Senior Member
Join Date: Dec 2012
City & State: london uk
My Country: uk
I'm a: Knowledge Seeker
Posts: 182
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![]() Quote:
It is not intuitive to select the higher postage costs but it's generally available on all listings, as I recall you use a dropdown menu to select different options within your basket. Look and use sellers by the quantity of the orders and there feedback of the quality of the goods. Don't just buy product only on the basis of the price, which I am guessing you have done previously. You may pay a little extra but at least you will get it quicker and better quality. |
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#9 |
Great Sage 齊天大聖
Join Date: Dec 2009
City & State: Europe
My Country: some shithole run by Israeli agents
I'm a: Professional Tech
Posts: 26,417
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![]() heat needs to be 300-350 really
as for ali, dont use "super cainiao" shipping, stick with ali standard or saver |
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#10 | |
Badcaps Veteran
Join Date: Apr 2013
City & State: cheshire
My Country: uk
I'm a: Knowledge Seeker
Posts: 350
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![]() Quote:
and then increase temp if the item is stubborn and use the smallest nozzle on my s station to prevent other close components flying off . i will try 300-350 thanks |
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#11 | |
Badcaps Veteran
Join Date: Apr 2013
City & State: cheshire
My Country: uk
I'm a: Knowledge Seeker
Posts: 350
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![]() Quote:
i will follow it on next order |
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