Samsung UN60ES6500FXZA Power Supply Issue

[Cookybaby]

Hello Everyone, this is my first post and I am excited to be a part of such a great community. I've been reading these forums for awhile and there really is some good friendly people here. No bashing and being rude like 90% of other forums Ive been to. Lets get to the good stuff.

I have two years of college in Electronics Engineering Technology. Ive been tinkering with electronics sine about 1990. I know enough just to be dangerous, so be gentle.

Make: Samsung
Model: UN60ES6500FXZA
Power Supply P/N: BN44-00525A

Symptoms: The TV was given to me with a flashing red standby light and a clicking relay. When I plug the TV in I hear a click (TV turns on), then standby light "blink" "blink" pause "blink" "blink" pause "blink" "blink" pause "blink" "blink" pause "blink" "blink" then click (TV turns off). Repeats cycle over and over. No backlights at all.

1. I removed the back panel and the first thing I did was remove the Mainboard connector from the power supply. I plug the TV back in and hear a click and the relay stays in that position. No standby and no blinking and no backlights.

2. I unplugged the TV, removed the Backlights connectors from the power Supply board, lifted all three fuses and they were good, at this point, there is nothing plugged into the power supply board. I started poking around with a Meter and discovered that voltages were missing from a lot of points. I was seeing a lot of 0V on the hot side and the cold side.

3. I unplugged power and lifted the diodes DP804, DP805 andDP808 to test and they were good.

4.I removed QP801 and QP802, they tested good.
5. I then cut one leg of C814S, CP815S, CS818S, CS854, CM858 and CM851. They all tested bad with my Fluke 85 multimeter. You can see in the pics were I cut one leg and even removed on cap completely.

I cant find any information on this power supply or a schematic. No one has and repair kits or boards. i would rather repair this one if its worth the time and money. I was thinking of replacing all the caps, but wanted to get a professional opinion before I go any farther. Ive attached some pics, let me know if I need to post better ones. Thanks for any assistance with this issue.

[nomoresonys]

Re: Samsung UN60ES6500FXZA Power Supply Issue

Replace those electrolytic caps that tested bad, it may be your only problem.

[R_J]

Re: Samsung UN60ES6500FXZA Power Supply Issue

Those caps are all likely ok, If you were getting a flashing standby led I suspect the power supply is ok, Reinstall all the parts you removed etc. and then disconnect the cable between the main board and the power supply and see if you get any backlights, if not check the voltage ACROSS CP814s it should be around 385v

You should have A5Volts standby across CS854
Check the voltage across CM858 or 859

The capacitance range on that meter is max 5µf

[nomoresonys]

Re: Samsung UN60ES6500FXZA Power Supply Issue

Was taking his evaluation at face value, if something tests bad and you tested it correctly change it, still would not be surprised if it was a bad cap or two. The first thing I check with a clicking relay is solder joints. The tv is 11 years old, so no I wouldn't be surprised at all to see a bad cap.

[Cookybaby]

Re: Samsung UN60ES6500FXZA Power Supply Issue

Thanks for the responses. As I stated in the original post, I already disconnected the mainboard from the power supply and no backlights.

@nomoresonys: I did check and re-solder all the solder joints for the bigger caps, but not the small blue ones. I didn't see any damage on the board at all, no bulging caps, burns spots, etc. The board was very clean, not leaving me much to go on. I did check the caps correctly, but I find it hard to believe that they are all bad. The only thing that I can think of that might cause ALL the caps to go bad would be and lightning strike of some sort.

I tested the caps by switching the meter to the Caps position and making sure the range was at uF. I shorted the two leads on the capacitor, then measured across the caps on + and - respectively. On all caps I got OL on the meter. I was expecting to see a increase in voltage until it went infinity. So, you think I should replace all caps and power it up?

[Cookybaby]

Re: Samsung UN60ES6500FXZA Power Supply Issue

@R_J, I will do what you suggested and report back here. Thanks!

[nomoresonys]

Re: Samsung UN60ES6500FXZA Power Supply Issue

You want to look at all the solder joints, the ones on the transformers and the components on heatsinks work hard, look very closely at those, examples of bad joints there: https://www.google.com/search?client...h=599&dpr=1.09

[nomoresonys]

Re: Samsung UN60ES6500FXZA Power Supply Issue

Well if you don't have a capacitor tester and your meter can't measure more than 5 uf, it's not capable of measuring them correctly so you would get OL, that doesn't mean they are bad or good, it just means it's beyond the meters capability, them being all way more than 5uf, you can get a rough idea if they are working by setting your meter to 20k ohms and testing on the leads should go steady up or down, switch leads and see if it does the same, I use just a regular non-auto ranging meter set on 20k ohms for that quick simple test, of course that does not let you know if the capacitance is alright.

[Storyteller12]

Re: Samsung UN60ES6500FXZA Power Supply Issue

This power board is famous for a lot of different faults. They do sell a repair kit for this with fuses, diodes etc. it's quite a few parts. It not in stock but at least you can see the parts and give you an idea what to check.

[nomoresonys]

Re: Samsung UN60ES6500FXZA Power Supply Issue

Good find, I looked there but didn't see that one.

[Cookybaby]

Re: Samsung UN60ES6500FXZA Power Supply Issue

This power board is famous for a lot of different faults. They do sell a repair kit for this with fuses, diodes etc. it's quite a few parts. It not in stock but at least you can see the parts and give you an idea what to check.

This repair kit is for a BN44-526A, I have the BN44-525A, not sure if there is any difference in output. The board is physically different. I have the schematic for 526A and compared it to my board. They are close but not exactly the same.

[Cookybaby]

Re: Samsung UN60ES6500FXZA Power Supply Issue

Those caps are all likely ok, If you were getting a flashing standby led I suspect the power supply is ok, Reinstall all the parts you removed etc. and then disconnect the cable between the main board and the power supply and see if you get any backlights, if not check the voltage ACROSS CP814s it should be around 385v

You should have A5Volts standby across CS854
Check the voltage across CM858 or 859

The capacitance range on that meter is max 5µf

Im going to retest all the Caps using the Ohms 20K scale as suggested below. Then I will test the others mentioned here and report back what I find.

[Cookybaby]

Re: Samsung UN60ES6500FXZA Power Supply Issue

Those caps are all likely ok, If you were getting a flashing standby led I suspect the power supply is ok, Reinstall all the parts you removed etc. and then disconnect the cable between the main board and the power supply and see if you get any backlights, if not check the voltage ACROSS CP814s it should be around 385v

You should have A5Volts standby across CS854
Check the voltage across CM858 or 859

The capacitance range on that meter is max 5µf

I reinstalled everything, powered the TV on without mainboard plugged in, there were no backlights. I measured across CP814s as you suggested and got 401v. There is 5v across CS854, so thats good. I got 0V across CM858 and CM859. Should I pull DM853 and DM854 and test?

[Storyteller12]

Re: Samsung UN60ES6500FXZA Power Supply Issue

I circled the part that is always bad on the ones I repair. Usually you have to remove the heatsink and you will see it's blown apart. At least that's how mine were.

There is usually more parts that need replaced but this seems to be a good starting point

[R_J]

Re: Samsung UN60ES6500FXZA Power Supply Issue

I reinstalled everything, powered the TV on without mainboard plugged in, there were no backlights. I measured across CP814s as you suggested and got 401v. There is 5v across CS854, so thats good. I got 0V across CM858 and CM859. Should I pull DM853 and DM854 and test?

That voltage indicates the pfc circuit is working, so most of the primary is ok, I suspect (as suggested above) that the ICM801 under the heat sink is bad. they don't always blow the FP803S fuse. You may also want to check if RM807 is not open. Once you remove the heat sink you may see a damaged ic. It is likely a FSFR-1700 or similar ic

[Cookybaby]

Re: Samsung UN60ES6500FXZA Power Supply Issue

That voltage indicates the pfc circuit is working, so most of the primary is ok, I suspect (as suggested above) that the ICM801 under the heat sink is bad. they don't always blow the FP803S fuse. You may also want to check if RM807 is not open. Once you remove the heat sink you may see a damaged ic. It is likely a FSFR-1700 or similar ic

I removed ICM801 and found that it wasn't destroyed, but no idea if it is bad. I lifted the leg of RM807 and it tested as a dead short (.5ohm on continuity test).

This would explain why TM801s has 0V on the hot side. I havent reach the knowledge of where I can "see" whats going on in the circuits. I know how components operate, but I dont know how they play together! Trying to get there!
I attached pics.

[R_J]

Re: Samsung UN60ES6500FXZA Power Supply Issue

The high voltage is supplied from CP814s, through FP803S through JP847 to icm801 pin1, the ic then switches the primary via pin10. The primary gets switched at about 100khz so you won't measure any real DC voltage on the primary. The ic also requires VCC on pin7, check that there is about 15vdc on CM812

[Cookybaby]

Re: Samsung UN60ES6500FXZA Power Supply Issue

The high voltage is supplied from CP814s, through FP803S through JP847 to icm801 pin1, the ic then switches the primary via pin10. The primary gets switched at about 100khz so you won't measure any real DC voltage on the primary. The ic also requires VCC on pin7, check that there is about 15vdc on CM812

Sorry for the delay, I had to travel out of town unexpectedly. I will post the results later today.

[videotronics]

Re: Samsung UN60ES6500FXZA Power Supply Issue

I would research the 2-blink code in the service manual and google search. This television made in 2012?

[videotronics]

Re: Samsung UN60ES6500FXZA Power Supply Issue

When no backlight I use my LED string tester, remove the back and find the connector to the backlight on the power supply, count the pairs of wires and attempt to light the strips before removing the panel.