samsung le32a457 bad cap symtoms but look okay

[selldoor]

Re: samsung le32a457 bad cap symtoms but look okay

Did you remove ALL the yellow/brown glue.
I cant see that you got an answer to why, which is, as it ages, and with heat the glue becomes corrosive and as it turns brown conductive rotting traces and shorting out
components.


EDIT
Did you replace all the caps budm said - there is a group of 4 to the right of the Big yellow transformer, one of which is the startup cap.

Check over all your soldering and can you post a clear picture of the bottom of the board.

[steveo3002]

Re: samsung le32a457 bad cap symtoms but look okay

ive replaced the 7 bigger caps on the top half of the picture

no i did not touch the glue as i didnt get an answer on how or why

will post a pic later..

[budm]

Re: samsung le32a457 bad cap symtoms but look okay

This is what bad glue can do to the board.
https://www.badcaps.net/forum/showthread.php?t=34692

[steveo3002]

Re: samsung le32a457 bad cap symtoms but look okay

heres 2 pics

looks a bit shabby to my untrained eyes , lots of residue etc?? its never been wet or mistreated owned sinse new

sometimes trys and trys to come on , flicks on then trys again and eventualy comes on

[selldoor]

Re: samsung le32a457 bad cap symtoms but look okay

How to remove the glue: with great care , not to damage traces or components. It is not easy people have their own favourite tool.
Dental pick, awl, sharpened toothbrush handle (chisel tip or point)
Sometimes the glue can be softened a little with IPA.
Do a bit at a time so you dont loose concentration.

[selldoor]

Re: samsung le32a457 bad cap symtoms but look okay

The Trys and Trys to come on could be the startup cap what values are the 4 small ones.
it is often a 50v 68uf

[steveo3002]

Re: samsung le32a457 bad cap symtoms but look okay

the 4 are

all 105 deg
470uf 25v
680uf 25v (35v now fitted)
680uf 35v
3300 uf 10v

would it also make the tv turn off

edit - during the off and wont come on , the led can either be off or on

[budm]

Re: samsung le32a457 bad cap symtoms but look okay

I am sure the small caps do not come with the kit.

[steveo3002]

Re: samsung le32a457 bad cap symtoms but look okay

budm - what kit ?

i looked on ebay and most were 3 or 4 parts , sellers wouldnt say which ones , so i figured i would order all the big ones in the hopes it would replace the faulty one but no lol

[tom66]

Re: samsung le32a457 bad cap symtoms but look okay

My thought would be main board issues. If the power board voltages are ok, then it is probably the main board at fault.

[selldoor]

Re: samsung le32a457 bad cap symtoms but look okay

the 4 are

all 105 deg
470uf 25v
680uf 25v (35v now fitted)
680uf 35v
3300 uf 10v

would it also make the tv turn off

Probably not I have been looking at the back of the boards as it may be a
bad joint or crack in the solder. Best way is to go over it all with a magnifying glass. I felt one or two were a bit iffy but can you have a look at this one.
I recommend removing the old solder and applying fresh.

[steveo3002]

Re: samsung le32a457 bad cap symtoms but look okay

i think thats one ive already reheated ..it did sizzle though is that normal?
i can go back and remove and replace the solder

[tom66]

Re: samsung le32a457 bad cap symtoms but look okay

If a solder joint is sizzling, your soldering iron is probably far too hot.

[steveo3002]

Re: samsung le32a457 bad cap symtoms but look okay

just that one in the pic sizzled ..none of the others did

just a little antex 20w iron

[Caleb]

Re: samsung le32a457 bad cap symtoms but look okay

My favorite method for removing glue is using the canned air upside down to super freeze it first then it chips off easily.

[selldoor]

Re: samsung le32a457 bad cap symtoms but look okay

My favorite method for removing glue is using the canned air upside down to super freeze it first then it chips off easily.

- not heard that one before - I like it

[tom66]

Re: samsung le32a457 bad cap symtoms but look okay

I use an old toothbrush and IPA - most glues will be dissolved by the IPA.