Repareer je spullen Gemeenschap Winkel

2612 Vragen Bekijk alle

Opties

Samsung TV Backlight Doesn't Turn on but there is Video and Sound

  • Model: UE32F5300AKXXU | Version No: 3
  • Chassis: CY-HF320BGSV1H
  • Panel: BN96-28700D
  • Power Supply Board: BN44-00605A
  • TCON Board: RUNTK 5361TP
  • Main Board: BN41-01958B

I am very positive (though I could be wrong) that it is a Power Supply Board Issue. The capacitors look fine and the rest of the board does too but The Backlight Doesn’t Turn On. The panel should be working correctly because I Did The Flashlight Test and There Is An Image. Also, when I disconnect the cable from the PS Board to the Main Board the backlight STILL doesn’t turn like it should. This leads me to believe this is Likely NOT a TCON or Main Board Issue. Also also, I have read a couple of posts about this issue that state that This may be a sign of Blown LED Backlight Assemblies, however I am highly doubtful of that since I have gotten this issue multiple times. If this was the issue, I should not have been able to fix it by just reconnecting wires. I checked the voltages on the CNM803 and they seem fine, but the CNL803 is a different story. All the pins give pretty much no voltage except for pin 12 which starts at 223V, slowly goes down to 196V and then comes back to 223V. This is very suspicious and is where I am stuck right now, I’m not sure what could be causing this or how I can fix it. If anyone could give me advice on how to fix this I would be very grateful.

Also I know I could just replace the board but I would like to fix it myself if possible.

Images:

Block Image

Block Image

Block Image

Block Image

Block Image

Block Image

Update (12/29/2019)

Good news! turns out the problem was a diode on the PS Board but it’s a very easy fix, just had to replace it and now the tv works great.


Block Image

Beantwoord deze vraag Dit probleem heb ik ook

Is dit een goede vraag?

Ja Nee
Score 0
2 opmerkingen

I have exactly same issue for the same PS model, but could not solve the problem. Which is the diode you replaced?r

door

I replaced the first one from the bottom in the last picture, however this isn't necessarily the solution to your problem. If you have all the signs that I did, it just points to a faulty ps board.

I got to the diode by measuring everything with a multimeter, feel free to try what I did but beware that it might not solve the issue.

door

Voeg een opmerking toe

1 Antwoord

Filteren op:
Meest nuttige Nieuwste Oudste
Het nuttigste antwoord

Opties

Hi @peterplaczek ,

If you have high voltage on the backlight cable connector on the power board and no backlights are on there is an open circuit between the power board and or in the backlight array. The voltage is being driven high trying to turn on the LEDs

You'll have to track the cable to where it connects to the backlight array and start checking for continuity to see where the open is.

It may be that there are some faulty LEDs causing the open circuit or a faulty connection on the pcb that the LED array and the cable from the power board connects to. Not totally sure if your model has this small pcb but the cable from the power board connects to the array somehow

Here’s a video that may help

Was dit antwoord nuttig?

Ja Nee
Score 3
Voeg een opmerking toe

Voeg je antwoord toe

Peter Placzek zal eeuwig dankbaar zijn.
Weergavestatistieken:

Afgelopen 24 uren: 0

Afgelopen 7 dagen: 0

Afgelopen 30 dagen: 14

Altijd: 1,235