Samsung un65fh6001 has no standby light and no power please help

[Jp06]

Re: Samsung un65fh6001 has no standby light and no power please help

Well technically it's not a brand new main board that i bought. The seller stated that it was pulled from a broken screen tv.
With the original main board connected i got good readings at those locations from the picture i circled in red. But i got no standby led and backlight didn't come on. If i removed the tcon connector (circled in blue) i still have no standby led but the backlight came on. Do you think that there is a short circuit somewhere on the tcon board that causes this?
Capleaker suggested that this is a bad main board issue so i found one on ebay.
When i swapped the main board i got from ebay, i got a reading of zeros at those connections and no standby led. Plus the backlight didn't not come on whether the tcon board was connected or not.
I used the screw on the board as ground when doing those readings.

[dick_barton]

Re: Samsung un65fh6001 has no standby light and no power please help

The voltages all appeared to be good in your original posting.
I wonder if rockit711 may have touched upon a possible problem.
Have you measured the voltages on the IR board to see that they too are present.
It may be that the keypad/IR board is not responding.

[Diah]

Re: Samsung un65fh6001 has no standby light and no power please help

hold on, you will lost either the reader over here..

first put back yours original main board, keep the LVDS from main to T-CON connected, just release out the Ribbon cable from T_CON side which go to the panel, and read voltage on PSU as you did at first post and write down here what you have voltage records.

[Jp06]

Re: Samsung un65fh6001 has no standby light and no power please help

So here is the voltages i got from the power button/ led standby (readings are from the red circles) with and without the tcon connected readings are the same for both ends.
I also noticed that when i put the meter to measure the LED i got 1 and the LED standby light come on (from the picture) backlight on when tcon disconnected.

[Diah]

Re: Samsung un65fh6001 has no standby light and no power please help

i don't know why you are make measure to IR section ??? and why u disconnected T-CON.. in this way no one can catch the fault if you do as you wish.

[rockit711]

Re: Samsung un65fh6001 has no standby light and no power please help

How are you measuring voltages? Those numbers don't seem right at all, is it possible your meter is set on diode test? That would explain the odd numbers and also the led illuminating.

Also where are you using as a ground reference? As I mentioned earlier if you are using chassis ground you may miss a bad ground connection (in my case the bad ground was on one of the keypad cable connectors). Try to measure to the ground on the same board as you are testing.

[Jp06]

Re: Samsung un65fh6001 has no standby light and no power please help

Thanks Diah. I apologize for any confusion as i am an amateur at this. I have to go somewhere right now but when i get back tonight i will start from the beginning and do as Diah suggested. And Rockit711 i think i might of made that mistake on the meter. Thank you so much guys and hopefully you all can help me get this tv working right again.

[CapLeaker]

Re: Samsung un65fh6001 has no standby light and no power please help

So here is the voltages i got from the power button/ led standby (readings are from the red circles) with and without the tcon connected readings are the same for both ends.
I also noticed that when i put the meter to measure the LED i got 1 and the LED standby light come on (from the picture) backlight on when tcon disconnected.

Looks like you have the meter set in diode or ohm setting. Put your meter in DC volt and re measure that again.

[dick_barton]

Re: Samsung un65fh6001 has no standby light and no power please help

Diah, My thoughts are that if the 3.3V is missing from the IR/Keyboard board then there is the possibility of no standby led and no response from the remote control or the side panel touch buttons. The original posting appeared to show that the power supply voltages were all looking good.

[Diah]

Re: Samsung un65fh6001 has no standby light and no power please help

you can disconnected IR section from most LED LCD Tv and Tv keep working as its last state of shutdown saved on NVM

IR just nothings there are on main boards section od DC to DC converter which ready the PW-ON .V and eeprom give signal to switch it forward PSU after the firmware first boot step exam no fault at DC to DC or other parts.

he wrote before with original main boards it gone to standby after 5 minutes, but he didn't considered that Tv are running 5 minutes with out signal so usually go to sleep ( standby as no signal )

this why i wrote here don't lost and make us lost with you. as he may did wrong with meter reading

[dick_barton]

Re: Samsung un65fh6001 has no standby light and no power please help

Ok

[Jp06]

Re: Samsung un65fh6001 has no standby light and no power please help

Hello everyone this time i'm uploading pictures along with descriptions so ya can tell me what i'm doing wrong.
fig1. this is my cheap meter with this setting for the readings.
fig2. with original boards and everything is connected.
fig3. I get these readings. Measurements from the power board side and main board side. Readings are the same. And i use the screw in fig 4 for gnd.
fig4. screw for grounding.
fig5. readings from the back of power button mini board. Readings are the same from the main board side and power button board.

Fig6. as suggested by Diah to release the ribbon cable from tcon side which go to the panel. In this case there are two.
So the readings from this scenario are.. Please refer back to fig3.. everything is the same except for the last two B5V.. readings are now at 5.2 instead of 5.34
And reading from Fig 5 is also the same.
BTW, when i release these two ribbons (circled in red) the backlight did not come on. It would only come on when if i disconnect the tcon from the main board.

Then i replaced the original main board with the one i got from ebay. I got readings of zeros for fig3 with the two ribbons connected and disconnected. But I got this from the power button mini board..
fig7. the IR reading fluctuate between .4 .5 and .6 same with 3.3V and key1 and key2 and LED is zero.

I hope i've done the measurements correctly this time and that everyone can follow me. Thanks ahead for the all the helps guys!

[Diah]

Re: Samsung un65fh6001 has no standby light and no power please help

1- yours ebay boards when you put it the LED of stand by go Red. did you try to switch the TV with remote control... if you did and nothings happen then this boards don't match this set or defect

2- yours original main boards had defect or bad Soldering

i suggest you to put every things back as original ( dont forget the back light sockets ) as it show in photo open. and use when TV off use hot air gun to heat the big chips on the main boards

when you turn on the TV put signal at it you may hear sound .. and give attention on the screen to watch any sign of picture or light.

[rockit711]

Re: Samsung un65fh6001 has no standby light and no power please help

Something that needs clarifying: has the LED standby light illuminated in any configuration you have tried?

Also when you have the eBay main board connected you mention that all the power supply pins are 0v, does that include the one labelled A5v?

[dick_barton]

Re: Samsung un65fh6001 has no standby light and no power please help

With the original main board and power supply in place it looks like the 3.3V is missing and it would be worth checking the voltage regulators on the main board. The 3.3V probably supplies other components on the board.

[dick_barton]

Re: Samsung un65fh6001 has no standby light and no power please help

What numbers are on these components.

[Jp06]

Re: Samsung un65fh6001 has no standby light and no power please help

Diah in all scenarios the LED light does not turn on. I have another samsung tv at home and tried to use that remote and nothing happen. I will try the hot air gun method later. I will observe closely to see if i can find and defect on the main board.
the two fig. show the number on the main board.. they are compatible correct? I believe the board from ebay is bad.
Rockit711 LED standby does not turn on with any configurations. When the main board from ebay is in, yes, the A5v and everything is 0v.
Dick-barton.. please show me how would i proceed to check the voltage regulators. Fig.8 shows the numbers that you asked for. C604 and IC601

[Jp06]

Re: Samsung un65fh6001 has no standby light and no power please help

Oh i forgot to mention this... when put the main board from ebay in, i hear this little clicking sound coming from the power supply board.

[rockit711]

Re: Samsung un65fh6001 has no standby light and no power please help

If they are all 0v then you have no standby power with the eBay main board.

If you use the old main board, with the t-con all plugged in correctly (I believe from your previous posts this would result in no backlight or anything, correct?) Are all the voltages at the power supply 0v then or are some higher?

[Diah]

Re: Samsung un65fh6001 has no standby light and no power please help

forget the ebay boards, its not match or defect,

one things more, the B5V of PWB it read over 5 V. it mean of sure 100% you have open circuit at main boards. start with the Big Coils Filter if there crack solder.