Still clicking after replacing eeprom Samsung LE40M87BDX

[lin4sm]

As I have said in title TV relay is clicking.
Opened back, someone have tried to resolder caps on BN44-00167A power supply board. So I have just installed known good BN44-00167A board and TV still clicking. Then taken out BN41-00813E mainboard and replaced eeprom with blank chip. Installed back to TV. 1 click and after 15 seconds back into usual clicking.
Where is a problem, I have already 2nd mainboard exactly the same?

First photo original eeprom
Second photo empty eeprom
Third photo BN41-00813E Bottom
Fourth photo BN41-00813E Top

Am I doing something wrong?

[finntricky]

Re: Still clicking after replacing eeprom Samsung LE40M87BDX

i have had a problem with these model tvs not turning on, and found though this forum that there are 2 SM caps under the shield on the main board that needed replaceing,
think it was 100uf, tv is now fine with no probs.

[lin4sm]

Re: Still clicking after replacing eeprom Samsung LE40M87BDX

I will try to remove shield. Will check caps this evening. Are you talking about those bigger ones next to BGA chip?

[finntricky]

Re: Still clicking after replacing eeprom Samsung LE40M87BDX

yes, just replace them 2, thay are a bit of a prob to remove so be carefull, i have pulled the tabs before,
i replaced with normal caps and layed them down so the shield would still fit

[lin4sm]

Re: Still clicking after replacing eeprom Samsung LE40M87BDX

Finally I have manage to remove cover. Removed caps. I imagine they are 10V 1000uf. One measuring 960uf the other one measuring 910uf. I will try to replace them.
I am wondering could I try mainboard without metal cover? I know that this is as heat sink, but how hot are those two BGA chips?

[budm]

Re: Still clicking after replacing eeprom Samsung LE40M87BDX

Are you sure they are 1000uF, that will be quite big in dimensions?

[lin4sm]

Re: Still clicking after replacing eeprom Samsung LE40M87BDX

I have removed two big caps underneath of cover on top of them says V0012 1000 10T. I imagine this is 10V 1000uf capacitor see photo. The other photo of the space where metal cover was. I have highlighted places with red cross where capacitors were.
Unless I have removed wrong ones. There are only one that looks like 100uf, one is 47uf and others are 82uf.

[budm]

Re: Still clicking after replacing eeprom Samsung LE40M87BDX

They look big so you probably correct that they are 1000uF (some cap companies will use 1001 = 1000uF), 101 = 100uF, 100 = 10uF) since you verify with cap meter.
They are part of switching power supply. Do you have ESR meter?
Did you also try heating up that section under the shield to see if the TV will function mormally?

[steviewonder]

Re: Still clicking after replacing eeprom Samsung LE40M87BDX

yes,those caps are quite often faulty.Another problem that can also arise with those is a loud crackling through the speakers as it tries to start up.
Becoming increasingly common,it also seems the solder cracks underneath the dtv processing ic,also under the screening tin,causing the same issue of clicking,usually as the set is warming up.

[lin4sm]

Re: Still clicking after replacing eeprom Samsung LE40M87BDX

OK. I will head back to my workshop and I will try to replace those capacitors as one is on the lower side.
I do not have ESR meter. Will put in "to buy" list.

[lin4sm]

Re: Still clicking after replacing eeprom Samsung LE40M87BDX

Update. Replaced those two capacitors with 10V 1000uf. TV turns on. No clicking. Will do more testing now.

[budm]

Re: Still clicking after replacing eeprom Samsung LE40M87BDX

Great! The old caps are still within 20% tolerance so they probably have high ESR.

[ReeceyBurger123]

Re: Still clicking after replacing eeprom Samsung LE40M87BDX

Nice one thanks for the info

[lin4sm]

Re: Still clicking after replacing eeprom Samsung LE40M87BDX

Replaced capacitors for the second exactly same mainboard with the same symptoms. It started working too. Capacitance were good, most probably ESR out of range too
Will do further testing and will update later on.

[finntricky]

Re: Still clicking after replacing eeprom Samsung LE40M87BDX

yes your right, 1000uf ones, glad to see my input was usefull

[lin4sm]

Re: Still clicking after replacing eeprom Samsung LE40M87BDX

finntricky, thanks for guidance.
Thanks everyone for helping to sort out this problem.
TV is running few hours without problem now. Will check in the morning for cold start, but I think it should be OK.

[lin4sm]

Re: Still clicking after replacing eeprom Samsung LE40M87BDX

This morning I am turning TV and it is working!
Thank you everyone for your input, problem solved!

[tibimakai]

Re: Still clicking after replacing eeprom Samsung LE40M87BDX

I'm wondering, this can be the case on newer TVs as well, where there are no big capacitors on the board?
I have a clicking UN40C6300.

[lin4sm]

Re: Still clicking after replacing eeprom Samsung LE40M87BDX

I have UE40C6505UK sitting in a corner with bad main board. BN41-01444B BN94-03588P this main board forces power supply relay do clicking noise. Biggest problem there are only SMD components and few BGA chips. At the moment I do not have spare time to try to trace what is wrong with it. If someone would give a clue would be great.

[daveb9999]

Re: Still clicking after replacing eeprom Samsung LE40M87BDX

excellent advice after endless hours of searching and research it worked perfect on 3 sets thank you