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Does anyone know what this yellow substance is on my circuit board??

rego21

New Member
The yellow substance seems to be in the same places on both boards, I'm not sure if it's supposed to be there or not?? The circuit boards are from a power supply from a soundbar

20200807_120450.jpg
 

JimB

Super Moderator
Most Helpful Member
It is sticky stuff, ie glue which was put there to help give some mechanical stability to larger, heavier components.

JimB
 

ronsimpson

Well-Known Member
Most Helpful Member
Many products go through a vibration test. Large components will fall off the board. The legs will brake after time. (glue)
 

Nigel Goodwin

Super Moderator
Most Helpful Member
LFP205991-0001 in Google reveals this,, may help,,check photo for arrow.
Yes, I've replaced a number of PSU capacitors in 'Sony' soundbars - obviously it's NOT a Sony product, and is just bought in from China - because capacitors don't fail in 'real' Sony products as they fit higher quality ones than lesser manufacturers.

In fact I've got a Sony soundbar myself - I delivered a new one to a lady, and she asked me to take the old one and dispose of it for her. One quick capacitor later, and I disposed of it at my house :D

In fact, following your excellent link, if you check the original photos you can see that capacitor is domed, so most likely it's low ESR.
 

rego21

New Member

rego21

New Member
Yes, I've replaced a number of PSU capacitors in 'Sony' soundbars - obviously it's NOT a Sony product, and is just bought in from China - because capacitors don't fail in 'real' Sony products as they fit higher quality ones than lesser manufacturers.

In fact I've got a Sony soundbar myself - I delivered a new one to a lady, and she asked me to take the old one and dispose of it for her. One quick capacitor later, and I disposed of it at my house :D

In fact, following your excellent link, if you check the original photos you can see that capacitor is domed, so most likely it's low ESR.
Thanks for the insight. Yeah I replaced the capacitor mentioned in the link and that sorted the problem for the two of them:D
 

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