• Prior owner tried a replacement main board. No difference.
• Samsung 2x red blinking standby LED = panel fault
• Jumpered FB_TRDY_1 (pin 1 CN1300 left. main tcon->left side buffer boards) and FB_TRDY_3 (pin 95 CN1301 right. main tcon->right side buffer boards) This allows testing individual T-Con (on main board) connection to panel on this Samsung. Found fault on left side (viewing from rear of TV)
• Each side has 2 buffer boards, disconnected left side flex between 2 buffer boards. Fault is on the left most board.
• Tape masking eventually isolated to CN1300 pin 15 (CKV4_GOA) Display

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Samsung LN46C630K1F – Intermittent Backlight, BN44-00341B Power Board

Summary for TL-DR readers:
• Backlight is intermittent, may come on with TV boot or not. No flickering, never fails during TV on.
• Have obtained Samsung schematic & service documents - Can upload if helpful.
• Have read ALL applicable threads
• C1818 and CP820 replaced as low hanging fruit
• CN802 data taken for normal and failed BL operation. SUMMARY: Pin 2 - 5vDet = 3.52 @normal, 0.0 @BL fail. Pin 6 - EPWM = 1.631 @normal, 1.058 @BL fail.
• VCC pin (18) of PFC...

Hi, I have a Samsung GU65TU8079U, where the backlight is not working. I started with the typical Samsung test to disconnect the mainboard, still no backlight comes up.

Next I took out the PSU and took it to the bench. 13 V are there and also ~280 V on the LED connector (with nothing connected).
Now I am struggling with the connector pinout. On the component side of the PCB I find this label:


Also on the backside there is an identical pinout.



However that pinout does not make any sense looking at the traces. Pin 1 is the positive...

Hi everyone,

I’m not an experienced TV technician, but I do some basic electronics repair as a hobby. I’m a mechanical engineer by profession and have experience with soldering PCBs and working with ESP32 and STM32 embedded systems.

I have a 4-year-old Samsung QA55QN85AAKLXL Neo QLED TV. Recently, the backlight stopped working completely. The TV still boots normally — I can tell the LCD panel is working and the TV functions otherwise seem normal — but there is no backlight.

Here’s what I’ve checked so far:

• Power supply board outputs around 64–65V to the

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