Samsung UN60EH6000 Tries to come on, but stops

[karthur]

Symptoms:
When I turn the set on, it makes the welcome sound and the screen is dimly lit.
The power button flashes 6 times.
The screen stays dimly lit, but that is all it will do.

I have checked:
A. Visual inspection of P/S board (BN44-00500A), the Main board (BN94-05549E) and T-Con board (BN97-0655TC). Nothing looks burned or out of order.

B.On P/S board I checked the voltage going out of it. There are pins 1-9 (See attached image of connector).
Pin 1 to 4 (D1+ to D1-) =150Vdc
Pin 1 to 3 (D1+ to D1-) =150Vdc
Pin 6 to 9 (D2+ to D2-) =117Vdc
Pin 6 to 9 (D2+ to D2-) =117Vdc

C. On the 14 pin connector (see attached Image), I checked these between the pin and the chassis.
1 :12.83
3 :12.83
5 :12.83
7 :12.83
9 :0
11 :5.43
13 :5.43

D. In order to check pins 2 thru 14, I had to uplug the connector. Not sure if that was the correct thing to do or not, but I could not access the pins with it connected. Here are the readings I got.
2: 3.07
4 :12.83
6 :3.02
8 :0
10 :0
12 :5.45
14 :3.23

E: Checked fuse incoming fuse on T-con. It is ok.

What do I need to check on the P/S board to determine what the trouble is?

Thanks,
Kirk

[zomi]

Re: Samsung UN60EH6000 Tries to come on, but stops

Dissconnect the ribbons going to the lcd
1 at a time and see what happens,

[Davi.p]

Re: Samsung UN60EH6000 Tries to come on, but stops

It's not clear, do you have an image?? The backlight is evidently OK don't test it..

[CapLeaker]

Re: Samsung UN60EH6000 Tries to come on, but stops

Looks to me under B that you have a bad LED string D2.

[karthur]

Re: Samsung UN60EH6000 Tries to come on, but stops

" do I have an image"....

No image. When set comes on, the backlights are just dimly backlit. No video.

[CapLeaker]

Re: Samsung UN60EH6000 Tries to come on, but stops

Unplug the main board from the PSU and plug the TV in. See if the backlights come on full tilt.

[karthur]

Re: Samsung UN60EH6000 Tries to come on, but stops

Dissconnect the ribbons going to the lcd
1 at a time and see what happens,

I just tried that. No noticable difference with either ribbon unplugged.

Unplug the main board from the PSU and plug the TV in. See if the backlights come on full tilt.

Yes, the backlights are much brighter with that unplugged. When I plug it back in, they go off.

[karthur]

Re: Samsung UN60EH6000 Tries to come on, but stops

I just watched this YT video of a guy troubleshooting a Samsung T-Con board. He has the same symptoms as mine. Not the same board as mine (his is a BN95-00628 vs my BN97-0655) but mine has the same components that he is checking.

On coil L701 and L702, I have 0 and 0.7 volts. These should be 1 and 3.3 Volts. My L302 is 1.0, which is correct. Also on caps L7114 and 7122, I have .01... they should be 35V.

He says the problem is the "Switch Mode Power controller" chip on this board (ISL9860). He replaced the chip and it fixed his issue.

This sound right to you guys?

[CapLeaker]

Re: Samsung UN60EH6000 Tries to come on, but stops

Running the PSU without the main board proofed that there is nothing wrong with the LED strings. So maybe that measurement on string D2 was wrong? Anyway, next logical thing is to troubleshoot the Tcon board for voltages. I guess you found voltages missing, so yes... you are on the right track. Just to make sure, does the Tcon get power from the main?

[karthur]

Re: Samsung UN60EH6000 Tries to come on, but stops

....So maybe that measurement on string D2 was wrong?

I re-checked the D1 and D2. They are both 117Vdc.

.... next logical thing is to troubleshoot the Tcon board for voltages. I guess you found voltages missing, so yes... you are on the right track. Just to make sure, does the Tcon get power from the main?

There is only one cable going to the T-Con, so it looks like its getting the power from the main. There is 1-3V on various pins on the input side of the T-con. I checked the test ports on the output side (the ribbon cables) going to the panel and there is no voltage there. I am leaning toward the T-Con board being bad.

[budm]

Re: Samsung UN60EH6000 Tries to come on, but stops

So you do have 12VDC at the T-CON SMD fuse?

[karthur]

Re: Samsung UN60EH6000 Tries to come on, but stops

So you do have 12VDC at the T-CON SMD fuse?

Bud,
Yes, there is 12.75 V on both sides of this fuse (F301).

[budm]

Re: Samsung UN60EH6000 Tries to come on, but stops

Try disconnecting the flat cable between the LCD panel and the T-CON board to see some of those Voltages on the T-CON will be present correctly.

I cannot see the T-CON board in that picture.

[karthur]

Re: Samsung UN60EH6000 Tries to come on, but stops

Bud,
My bad. Did not realize the pic of the back was before I removed the entire panel. Here is a couple shots of me checking the input fuse (F301) and the voltage readings on the output side of the T-Con. Ribbon 1 and 2 gave the same readings.

If that is not what you were asking for let me know, I can get it.

Thanks
Kirk

[budm]

Re: Samsung UN60EH6000 Tries to come on, but stops

So what are you getting on those test points now without the ribbon cable to the LCD panel in place.
You were getting these per your report: On coil L701 and L702, I have 0 and 0.7 volts. These should be 1 and 3.3 Volts. My L302 is 1.0, which is correct. Also on caps L7114 and 7122, I have .01... they should be 35V.

[karthur]

Re: Samsung UN60EH6000 Tries to come on, but stops

So what are you getting on those test points now without the ribbon cable to the LCD panel in place.
You were getting these per your report: On coil L701 and L702, I have 0 and 0.7 volts. These should be 1 and 3.3 Volts. My L302 is 1.0, which is correct. Also on caps L7114 and 7122, I have .01... they should be 35V.

I get the same readings at those points with the output ribbon cables connected or not connected.

[budm]

Re: Samsung UN60EH6000 Tries to come on, but stops

That eliminated the shorts in the tab bonding board then.
So you will have to try new T-CON board at this point.

[Davi.p]

Re: Samsung UN60EH6000 Tries to come on, but stops

I can't work on the basis of someone other on a YT video, abs. needed a sunlight hires photo of the entire Tcon.
Then if U want i mark places where to test but you don't do as many other that i do the work and they disappear >:-(
ANd.... what are you using as Tester??? i don't see any tip! That tester is... shit... can't you grab a new one?
Get a ZT100 or ZT98 on ebay..

[karthur]

Re: Samsung UN60EH6000 Tries to come on, but stops

I can't work on the basis of someone other on a YT video, abs. needed a sunlight hires photo of the entire Tcon.......

Not exactly sure what you mean. I have just been doing research with what I have to work with.

....
Then if U want i mark places where to test but you don't do as many other that i do the work and they disappear >:-(.....

If you will show/tell me what to test, I can do it, and report back.

...
ANd.... what are you using as Tester??? i don't see any tip! That tester is... s*it... can't you grab a new one?
Get a ZT100 or ZT98 on ebay..

I don't do this professionally and it works just fine. I get dc Voltages and Ohm readings which is what I need to troubleshoot.

[Davi.p]

Re: Samsung UN60EH6000 Tries to come on, but stops

"Not exactly sure what you mean. I have just been doing research with what I have to work with." I mean i need TCON picture...

"I don't do this professionally and it works just fine. I get dc Voltages and Ohm readings which is what I need to troubleshoot."
But whitout TIP is ridicolous, on a board with very tiny smd components, you risk highly to burn it.. the tester i've said is not professional..