Samsung UE50H6400AK Panel or T-Con? Has Backlights And Audio

[dskall]

Re: Samsung UE50H6400AK Panel or T-Con? Has Backlights And Audio

They should be basically the same on left and right boards so you can measure across them with power off and compare with the other side. With power on you could also try feeling them to see if any getting hot

[Ridahz]

Re: Samsung UE50H6400AK Panel or T-Con? Has Backlights And Audio

I have just checked resistance on every single one of them SMDs and the only ones that gave me a 0 result are as follows...

C102
C202
C302
C402
C502
C602
C702
C802

Majority of the SMDs read 1.1 on the right side panel

Majority of SMDs on Left hand side read between 1.8 and 2.3. Only 1 which was C101 read 1.4!

Edit: Just to add all readings were done on the Resistance 200 selection of the Multimeter (lowest setting) no power cord was inserted or and power going through.

[Ridahz]

Re: Samsung UE50H6400AK Panel or T-Con? Has Backlights And Audio

They should be basically the same on left and right boards so you can measure across them with power off and compare with the other side. With power on you could also try feeling them to see if any getting hot

All on the right side gave a lower result on the same setting (side that fails to display image)

Did not try power on to see if any got hot though, may have to try that again tonight. Everything looked perfect on the panel boards and when i unscrewed the bezel the ribbons were in perfect condition also.

[Ridahz]

Re: Samsung UE50H6400AK Panel or T-Con? Has Backlights And Audio

Bump

[dskall]

Re: Samsung UE50H6400AK Panel or T-Con? Has Backlights And Audio

Pictures are not clear enough to read. Need to remove caps that read low. Maybe in parallel to find bad cap

[Diah]

Re: Samsung UE50H6400AK Panel or T-Con? Has Backlights And Audio

Bump

you had never checked the ribbon cable and its socket. you have shorted pin on them, if this was long time then yours T-CON need to replace.. but hope its not.

[Ridahz]

Re: Samsung UE50H6400AK Panel or T-Con? Has Backlights And Audio

Pictures are not clear enough to read. Need to remove caps that read low. Maybe in parallel to find bad cap

There was a cap from each section that read 0 but they could be a earth possibly?

you had never checked the ribbon cable and its socket. you have shorted pin on them, if this was long time then yours T-CON need to replace.. but hope its not.

Which ribbon cable do you refer too? I have changed T-con and no luck sadly.

[Ridahz]

Re: Samsung UE50H6400AK Panel or T-Con? Has Backlights And Audio

Ok I run the test again and here's my results for each side...

The block of SMDs below the sticky note gave 0 for everyone besides the rectangular one on the left and where C202 started all gave results onwards.



On the right side of the panel results were consistent with the left side. The block of SMDs on the right side from C706 to C719 gave 0 result.





I got consistent 0's on C104,204,304,404,504,604,704,804 so presume they are some sort of Earth. The only one I don't understand the 0 on is C001

Hope this updated information someone can recognise where the fault is?

Also I noticed with the TV powered on for say 15mins the T-Con got extremely hot! Don't know if that's supposed to happen :/

[budm]

Re: Samsung UE50H6400AK Panel or T-Con? Has Backlights And Audio

I am curious about your '0' reading on your meter 200-Ohm scale. What do you see on your meter when you short the meter probes together? What does the meter show when the two probes are not shorted together?
BTW, you did the test without the cable between the T-CON and the LCD panel not in place, right?

[Ridahz]

Re: Samsung UE50H6400AK Panel or T-Con? Has Backlights And Audio

I am curious about your '0' reading on your meter 200-Ohm scale. What do you see on your meter when you short the meter probes together? What does the meter show when the two probes are not shorted together?
BTW, you did the test without the cable between the T-CON and the LCD panel not in place, right?

Hi Budm!

I actually Re-run the test on the 200k setting and got much better results. I was doing it with 1 probe at each end of the SMD.

Had no power connected but sadly did not remove the T-Con ribbons. Guessing I made another noob move there?

When I put both probes together they display 0 although when i was doing the test they was giving a little result which i can't remember now so I guess I made another mistake there? Lol

Many thanks!

[Ridahz]

Re: Samsung UE50H6400AK Panel or T-Con? Has Backlights And Audio

Ok another update! Done the test for the 3rd time and got a result off all the SMD caps! No T-Con installed and tested every cap. All went to 2000 before the machine went back to 1 as it could not increase anymore.

SMDs that hit 1.8 were as follows...

C102, C103, A rectangular SMD, C303, C403, C501, C502, C503, C005, C002, C603, C703, C803.

This leads me to think it could be the 2F or 1P 3 pin chip on the board? Does anyone know how I would test that on the multimeter?

Edit: Compared the 1F & 1P chips compared to the others on the other side. Also checked out the rest of the chips on the board and compared them to each side. Exact same. All chips tested and none gave me 0 result? Seriously stumped now?!

Maybe the T-Con I ordered off eBay was already broken? Or a different board issue?

*Scratches head*

[tvtanner]

Re: Samsung UE50H6400AK Panel or T-Con? Has Backlights And Audio

Ok another update! Done the test for the 3rd time and got a result off all the SMD caps! No T-Con installed and tested every cap. All went to 2000 before the machine went back to 1 as it could not increase anymore.

SMDs that hit 1.8 were as follows...

C102, C103, A rectangular SMD, C303, C403, C501, C502, C503, C005, C002, C603, C703, C803.

This leads me to think it could be the 2F or 1P 3 pin chip on the board? Does anyone know how I would test that on the multimeter?

Edit: Compared the 1F & 1P chips compared to the others on the other side. Also checked out the rest of the chips on the board and compared them to each side. Exact same. All chips tested and none gave me 0 result? Seriously stumped now?!

Maybe the T-Con I ordered off eBay was already broken? Or a different board issue?

*Scratches head*

Hi- I have same problem with set i'm working on with same results you have. With both ribbons hooked up to to t-con I get little or no voltage to buffer boards. I disconnect the right ribbon and voltage came back on one side with picture on that side that I hooked up and the other side had just white screen. I hooked up other side by it self and had horiz lines on white screen for short time then faded out. the other side was dark. right side. I had little or no voltage on buffer board. I checked all resistance and capacitors and compared one side with the other and found nothing unusal My thoughts are that one side is bad on display and it shuts down when bad side is hooked up I also ordered t-con with same results. could be something on buffer board. I just believe there is no hope for these two sets. Good luck. I hope you find the answer.

[dskall]

Re: Samsung UE50H6400AK Panel or T-Con? Has Backlights And Audio

Is 1.8 ohms, kohms, mohms. 1.8 doesn't tell us much

[Ridahz]

Re: Samsung UE50H6400AK Panel or T-Con? Has Backlights And Audio

Is 1.8 ohms, kohms, mohms. 1.8 doesn't tell us much

My test was carried out on this multimeter on this setting. It actually read 018 but I presume that meant 1.8 resistance. Pic attached of the exact multimeter and arrow pointing at what setting it was on

[Ridahz]

Re: Samsung UE50H6400AK Panel or T-Con? Has Backlights And Audio

Hi- I have same problem with set i'm working on with same results you have. With both ribbons hooked up to to t-con I get little or no voltage to buffer boards. I disconnect the right ribbon and voltage came back on one side with picture on that side that I hooked up and the other side had just white screen. I hooked up other side by it self and had horiz lines on white screen for short time then faded out. the other side was dark. right side. I had little or no voltage on buffer board. I checked all resistance and capacitors and compared one side with the other and found nothing unusal My thoughts are that one side is bad on display and it shuts down when bad side is hooked up I also ordered t-con with same results. could be something on buffer board. I just believe there is no hope for these two sets. Good luck. I hope you find the answer.

Hey man. I believe you have the exact same issue as me! When the other side is plugged in the tcon board you get half a black/white fuzzy screen then all goes to white. I refuse to believe the screen is bad as all tabs are perfect condition. I just don't think many have ever digged deep enough to carry out an extensive repair.

[budm]

Re: Samsung UE50H6400AK Panel or T-Con? Has Backlights And Audio

When you look for bad parts with shorts or with very low resistance, you will want to use 200 Ohms scale that will show better resolution in Ohm Range. So you need to do the test again on those caps.
2M scale will not show you what the low Ohm resistance resolution, for example: If you check 1000 Ohm resistors on that 2000K (2 MILLION) Ohm scale, it will show as if that 1000 Ohms resistor has 0 Ohms!

[Ridahz]

Re: Samsung UE50H6400AK Panel or T-Con? Has Backlights And Audio

When you look for bad parts with shorts or with very low resistance, you will want to use 200 Ohms scale that will show better resolution in Ohm Range. So you need to do the test again on those caps.
2M scale will not show you what the low Ohm resistance resolution, for example: If you check 1000 Ohm resistors on that 2000K (2 MILLION) Ohm scale, it will show as if that 1000 Ohms resistor has 0 Ohms!

Thanks Budm, not afraid to admit I'm a noob to all this but willing to learn everything possible and determind to fix the short (before my missus kills me haha)

So tomorrow morning I will strip it down and re-test every single part on 200 setting and get back to you all. I take it i should get some form of reading on every SMD on that setting and any 0 will indicate a short? Have you repaired any of these panels with a short yet Budm?

EDIT: Also I'm right in thinking to test with both probes at either end of each SMD? Or ground the black one on the frame and red on each SMD?

[attainteddragon]

Re: Samsung UE50H6400AK Panel or T-Con? Has Backlights And Audio

you are measuring across each capacitor.

your meter should show what it does when is cant measure a resistance that high.
check a high value resistor first, so you know what your meter should be telling you in this case. (OL, 1 etc).

put your leads together and note the reading, probably just a few ohms.

that is what you are looking for in this case, a shorted cap. or readable on this scale of measurement.

[dskall]

Re: Samsung UE50H6400AK Panel or T-Con? Has Backlights And Audio

There has been a number of threads that have been bad caps on panel boards.

[Ridahz]

Re: Samsung UE50H6400AK Panel or T-Con? Has Backlights And Audio

you are measuring across each capacitor.

your meter should show what it does when is cant measure a resistance that high.
check a high value resistor first, so you know what your meter should be telling you in this case. (OL, 1 etc).

put your leads together and note the reading, probably just a few ohms.

that is what you are looking for in this case, a shorted cap. or readable on this scale of measurement.

Roger that. Will give it my best shot.

There has been a number of threads that have been bad caps on panel boards.

Dont suppose you can dig out a few threads where this has been done please? Have searched google but can only find the recent LG repair. Would be good to see others repair jobs.