Samsung la55c750r2f - screen goes green then won't turn on

[jimbojangles]

Hi all,

I've got a samsung la55c750r2fxxy LCD TV with a problem. After watching for a while, the screen briefly goes totally green (1 second), then goes black. The standby light goes off, but flashes red when you try turning it on again.

If the TV is unplugged for a few minutes, it turns back on normally again, but the problem continues to happen.

I've tried cleaning the ribbon cable, and I've replaced the 2 25v 1000uf capacitors on the power supply board, but the problem persists.

All the capacitors appear fine, but I'm considering replacing the rest of them on the power supply board.

Any hints, other than take it to Samsung?

Thanks!

[newtothis]

Re: Samsung la55c750r2f - screen goes green then won't turn on

Pics of each board and one of entire layout please

[jimbojangles]

Re: Samsung la55c750r2f - screen goes green then won't turn on

Pics of each board and one of entire layout please

Here are some pics - let me know if they're not adequate!

[nomoresonys]

Re: Samsung la55c750r2f - screen goes green then won't turn on

do you have a digital multimeter to test with?

[jimbojangles]

Re: Samsung la55c750r2f - screen goes green then won't turn on

do you have a digital multimeter to test with?

I've got one but I've never used it before. I might need to watch some youtube to know what you do with it!

[nomoresonys]

Re: Samsung la55c750r2f - screen goes green then won't turn on

for sure, youtube has good tutorials, when your comfortable, let us know, we can help you test.

[jimbojangles]

Re: Samsung la55c750r2f - screen goes green then won't turn on

Right! Skills acquired! Now, what should I be measuring?

[nomoresonys]

Re: Samsung la55c750r2f - screen goes green then won't turn on

ok, check the connectors of power supply, the label is there by it, says 5v, 13v, 18v etc, looks like you can test from the back, the metal pins there, test with tv on, black probe to chassis, as always be careful working with power supply, HIGH VOLTAGE, on primary side can be deadly.

[ReeceyBurger123]

Re: Samsung la55c750r2f - screen goes green then won't turn on

Its seems to be heat related, if you have a hair drier use it and heat the boards, especially the tcon and motherboard too see if heating one or the other speeds the timing of the fault up showing you what board is at fault.

[nomoresonys]

Re: Samsung la55c750r2f - screen goes green then won't turn on

Hi all,

I've got a samsung la55c750r2fxxy LCD TV with a problem. After watching for a while, the screen briefly goes totally green (1 second), then goes black. The standby light goes off, but flashes red when you try turning it on again.

If the TV is unplugged for a few minutes, it turns back on normally again, but the problem continues to happen.

I've tried cleaning the ribbon cable, and I've replaced the 2 25v 1000uf capacitors on the power supply board, but the problem persists.

All the capacitors appear fine, but I'm considering replacing the rest of them on the power supply board.

Any hints, other than take it to Samsung?

Thanks!

could be those other caps, at least they dont cost a lot.