Samsung UN55H7150FXZA Dim Picture

[tvprobs]

Hello,

A family member brought me a TV that initially had an issue with a completely dimmed top half back light issue. Flashlight test proved picture was there. When i received it and powered it on. The middle backlight was dimmed, but the Top and bottom appear 100% illuminated. I haven't had experience with power supplies combined as inverters and i'm unsure how to check the voltages to determine power supply issues or backlight issues. Pictures of the power supply are attached. The inverter cables are disconnected as i was measuring voltage for the + pins both plugged in and not plugged in.
Sorry for the shadows, if needed i can re-take photos.

Voltages for connections CNL 801 A&B

CNL 801 A (connected and powered on)

9. 12V steady
7. about 110V average
5. about 110V average
3. 12V steady
1. 0V (N.C)

No voltages when disconnected

CNL 801 B (connected and powered on)

10. 0V (N.C)
8. 60V steady
6. 260V average
4. 260V average
2. 60V steady

CNL 801 B (cable disconnected and powered on)

10. 0V (N.C.)
8. 108V
6. 260V
4. 260V
2. 90V

[Andrew F. Ali]

Re: Samsung UN55H7150FXZA Dim Picture

The LED Driver seems to be working. You would have to open up the Panel and replace the LED strips with new ones.

[tvprobs]

Re: Samsung UN55H7150FXZA Dim Picture

The LED Driver seems to be working. You would have to open up the Panel and replace the LED strips with new ones.

That was my first thought, but as i have little experience with the back light and the symptoms kind of flipped i wanted to be sure there was not more troubleshooting I should be doing.