Help diagnosing faulty Samsung TV 32' UE32D5000

[vinceroger69]

Re: Help diagnosing faulty Samsung TV 32' UE32D5000

That great advice for the correct screwdriver. I assure you it didn't slip. Some of the screw unscrew without any extra force or issues. Some were indeed stuck. I had another person helping holding the frame from the other side while I put some elbow grease. The only explanation is that the screw are over-torqued from the factory. If they were screwed to plastic, this won't be an issue,but metal to metal...

The blinks are odd regardless, I do believe (unless is a false memory) that it use to blink just 3 times. Once it blinks to show that it detect the remote press. Then the screen would power on, turn off blink and then the TV would show TV channel. Also some articles indicate that this number of blinks is a telltale of a problems https://spacehop.com/samsung-tv-red-...nking-5-times/

i wonder if carrying out a factory reset could help with the flashing led issue

[nomoresonys]

Re: Help diagnosing faulty Samsung TV 32' UE32D5000

hes referring to threadlockers, the blue is easy to deal with the red is not, but I doubt they would ever use red on a tv: https://www.loctiteproducts.com/en/k...t-for-you.html

[Davi.p]

Re: Help diagnosing faulty Samsung TV 32' UE32D5000

Maybe i remember old days Samsung, so now 5 blinks is a fault, ok, i'll take note, but the site you linked seems the common time loser's site where 10000 words to say nothing ..just my thought.. about screws sometime metal to metal there is a blue glue i don't know the english name, may be too much of it.. the ways of progr. obsolescence are many..

[DarkGT]

Re: Help diagnosing faulty Samsung TV 32' UE32D5000

5 blinks on start is normal by Samsung, for the screws, if you put a moderate force on the torsion with the screwdriver and the tip jumps on the head it means it is not the right screwdriver, when a screw is somehow locked because of the head is tight to the metal base you must apply force very slowly until it unlocks.. the correct screwdriver is when the screw put on the tip remains a little stick to it also if you keep it horizontally

That great advice for the correct screwdriver. I assure you it didn't slip. Some of the screw unscrew without any extra force or issues. Some were indeed stuck. I had another person helping holding the frame from the other side while I put some elbow grease. The only explanation is that the screw are over-torqued from the factory. If they were screwed to plastic, this won't be an issue,but metal to metal...

The blinks are odd regardless, I do believe (unless is a false memory) that it use to blink just 3 times. Once it blinks to show that it detect the remote press. Then the screen would power on, turn off blink and then the TV would show TV channel. Also some articles indicate that this number of blinks is a telltale of a problems https://spacehop.com/samsung-tv-red-...nking-5-times/

[Davi.p]

Re: Help diagnosing faulty Samsung TV 32' UE32D5000

5 blinks on start is normal by Samsung, for the screws, if you put a moderate force on the torsion with the screwdriver and the tip jumps on the head it means it is not the right screwdriver, when a screw is somehow locked because of the head is tight to the metal base you must apply force very slowly until it unlocks.. the correct screwdriver is when the screw put on the tip remains a little stick to it also if you keep it horizontally

[DarkGT]

Re: Help diagnosing faulty Samsung TV 32' UE32D5000



Fixed! Summary, tools needed, cost and issues:

Preface: Samsung UE32D series would flash the backlight briefly. The readings of the Power board were okay, when the main logic board is disconnected the behavior is the same.

The TV screen have the following structure:
- Outer decorative frame with clips.
- Inner metal frame with screws on the side. *1
- LCD screen.
- 3 layers for diffusing and light adjustment, hold by cuts in the upper and down side of the plastic inner frame. (3 on top, 2 on bottom)
- Inner plastic frame that holds the hard transparent glass like diffuser. *2
- Hard plastic diffuser.
- Thick sheet of while paper before the metal frame.
- Metal frame
- 2 strips of edge lit backlights. *3

Issues:
Main one - one of the LEDs on the backlight strip was open circuit. The other were also broken, but when measured in diode mode in the wrong direction they would show a reading of 860 Ohms (just like those that work fine). I performed temp solution by using a wire to bridge the open circuit. It worked fine with shadows on the screen (don't recommend, danger of breaking something).

from above
*1: The metal frame had screws that were over tight from the factory. I used hammer and screw driver to hit them from the side, until they unscrew. I have to do this 6-7 times. Danger of breaking the LCD in this way, had no other choice.
*2: The plastic frame became brittle from the age. Ended up with 4 pieces that I glued with tape, doesn't hold the screen as it use to. Can't be done any differently.
*3: The people from the factory used f* power hammer for those screws, even for the back light screws. One of the sides couldn't be screwed completely from the damaged screw threads. I ended up using few drops of superglue for one of the sides. I also tried low viscosity oil for the screw holes. Other solution would be using thermal glue that would allow heat transfer, worst case thermal paste for cpu and super glue.

Tools needed:
Philips screw driver (very small size) and regular one. Optional and not recommended - hammer. Tape, to tape any lose parts during disassembly. Something clean to wipe any prints or dust from the screen before you assemble.

Cost:
You time and sanity. The backlight costed about 27 USD, and it's not an OEM, reduced brightness and resistor mod recommended.

New and remaining issues:
-Dust under the screen.
-Slow start/5 blinks of the red power indicator. I thought that would disappear once the backlight is replaced, but I was wrong. This is indicator of remaining issue that the logic board likely detects.

Since the TV once it turns on after 10 sec, works fine, just as it use to. I'm leaving it as is.

Thanks to Bad caps for having such excellent forum for everyone who have a question.

[Davi.p]

Re: Help diagnosing faulty Samsung TV 32' UE32D5000

sorry, reducing not refuncing..

[nomoresonys]

Re: Help diagnosing faulty Samsung TV 32' UE32D5000

guess its these here: https://www.digikey.com/en/products/...7100RL/1082858

[nomoresonys]

Re: Help diagnosing faulty Samsung TV 32' UE32D5000

^^^I disagree and so do many others, a lot of led early death is caused by being over-driven, which the mod addresses, people are NOT doing it just for fun. TomTechTod is a pro and knows exactly WHAT AND WHY he's doing it, the end.

[Davi.p]

Re: Help diagnosing faulty Samsung TV 32' UE32D5000

If i understand well right bar is connected in series with left one and holds a single faulty led, it works 50% so this tricks the protection, modifying the resistors is not useful when replacing all leds, neither refuncing much the brightness, i think.. leds faults are due to spikes..

[nomoresonys]

Re: Help diagnosing faulty Samsung TV 32' UE32D5000

this smart youtuber does a lot of them: https://www.youtube.com/watch?v=dPu_BeKVONI

[nomoresonys]

Re: Help diagnosing faulty Samsung TV 32' UE32D5000

I will, the replacement will likely not be an OEM, so better safe...
Also I found a repair video on my model that does a resistor modification by adding another one in series to the existing one, the repairman does that to reduce the power to the leds, right? https://www.youtube.com/watch?v=zOTDUOh_3e0 , could I do the same or there is no point doing it?

Also I'm wishing a Happy new year to everyone reading this

yes, great mod and not very hard, just need to make sure you deal with the right resistor/s.

[vinceroger69]

Re: Help diagnosing faulty Samsung TV 32' UE32D5000

9 out of 10 tvs i have for repair lately are led issues pity china is taking so long to ship replacements to the uk

[DarkGT]

Re: Help diagnosing faulty Samsung TV 32' UE32D5000

ok, yep thats what usually goes wrong, after installing new backlights be sure to turn them down if you can, to as low as you can stand, makes them last much much longer. They lasted 11 whole years, that's a pretty good run.

I will, the replacement will likely not be an OEM, so better safe...
Also I found a repair video on my model that does a resistor modification by adding another one in series to the existing one, the repairman does that to reduce the power to the leds, right? https://www.youtube.com/watch?v=zOTDUOh_3e0 , could I do the same or there is no point doing it?

Also I'm wishing a Happy new year to everyone reading this

[nomoresonys]

Re: Help diagnosing faulty Samsung TV 32' UE32D5000

ok, yep thats what usually goes wrong, after installing new backlights be sure to turn them down if you can, to as low as you can stand, makes them last much much longer. They lasted 11 whole years, that's a pretty good run.

[DarkGT]

Re: Help diagnosing faulty Samsung TV 32' UE32D5000

Thanks CapLeaker Davi.p nomoresonys Rajnhl for the help troubleshooting so far. I think Davi was closest to the actual cause of the problem which is : (dramatic pause)....

Bad led chips on the backlight strips, 3 on the left side and 4 of the right bar side. I have dissemble the panel and beat that glue, super thigh screws etc.etc, and got to two led strips model 2011SVS32 _456K _H1 _1CH. When turn on the backlight would flash the left completely (or at least that how it looked), and only half of the right bar. When tested in diode mode with my multimeter as I wrote - 7 in total are the bad light chips.
I guess that would explain this odd behavior? Maybe the power supply sense a short or too high resistance and would briefly try to power them on, sense problem and turn them off ?

I would take more that a month for a replacements to arrive (if at all those chinese sites aren't reliable). Is there any way to bypass the bad led chips like with resistor to fix the flow of electricity, yes I know it's stupid, but will be temp fix until I get replacements.

[Rajnhl]

Re: Help diagnosing faulty Samsung TV 32' UE32D5000

try changing capacitors in backlight section, even if they appear good , they become weak over time.

[nomoresonys]

Re: Help diagnosing faulty Samsung TV 32' UE32D5000

also basic checks, check all diodes and resistors on top of board for starters, google is your friend if needed.

[nomoresonys]

Re: Help diagnosing faulty Samsung TV 32' UE32D5000

can you list all 14 pins according to the map beside it, like power-on, A5, gnd etc, need to know all of them since I have no picture.

[DarkGT]

Re: Help diagnosing faulty Samsung TV 32' UE32D5000

check voltages of cnm803, neg. probe on metal chassis, check in standby[plugged in power off] take note, leave probes in place, power on take note, report both conditions here for every pin, example power on, standby 0, powered on 3.3 volts, example of testing: https://www.youtube.com/watch?v=XH9GfkGQX1I

Thanks for the suggestion nomoresonys. Here is the readings I took.
OFF (stand by) Power ON all DC voltages measured
- 0.6v - 13v
- 0.63v - 12.95v
- 0.64v - 12.94v
- o.64v -12.94v
-0.01v - 0.000 (I hope that's the ground pin)
- 0.01v - 5.54v
- 0.00v - 5.54v

I'm not having hair dryer, so I try tomorrow to think of a way to safely heat it.
The backlight should stay on with the main board disconnected, right? My model is not some exception?
Thanks for the suggestions so far guys, keep them coming .
Edit: Video I recorded of the weird behavior when voltage of the backligh is measured https://youtu.be/2nxef4nPk4w