Samsung TVs are generally reliable, but when they do fail — often years into their service life — the failure is frequently in a specific PCB (printed circuit board) that can be replaced as a standalone part rather than requiring a full TV replacement. This guide covers the most commonly replaced Samsung TV boards, how to identify the right part number for your specific TV, where to source genuine and used Samsung TV parts, and what each board replacement involves in practice.
For comparison guidance on which Samsung TV to buy new, see our Samsung TV vs LG vs Sony comparison guide covering QLED vs OLED and model-specific recommendations.
Samsung TV Board Types: What Each One Does
| Board Type | Function | Common Failure Symptoms |
| Main board (BN94-XXXXX) | Processes all video/audio signals; runs the smart TV OS; controls all other boards | TV powers on but no picture or sound; smart features not working; HDMI ports unresponsive |
| Power supply board (BN44-XXXXX) | Converts mains power to DC voltages for all other boards | TV won’t turn on; clicking on/off at startup; standby light blinks |
| T-Con board (BN95-XXXXX or BN96-XXXXX) | Timing controller — drives the LCD panel pixels | Lines across screen; half screen dark; picture scrambled with panel still lit |
| LED driver board | Powers the LED backlight strips | Dim picture; dark patches across screen; picture visible only with flashlight in dark |
| One Connect Box | External connection hub on premium Samsung TVs | No signal on any input; intermittent connection loss |
Samsung BN94-18259W Main Board
The Samsung BN94-18259W is a main board (also called a motherboard or system board) used in several Samsung LED TV models. It is one of the more frequently searched Samsung TV part numbers, indicating a relatively wide install base across Samsung’s mid-range and commercial display lineup.
What the BN94-18259W controls
The main board on a Samsung TV is the central processing unit — it runs the Tizen smart TV operating system, processes HDMI and other input signals, controls audio output, and communicates with the power supply, T-Con, and panel driver boards. When the main board fails, the most common symptoms are a TV that powers on (standby light illuminates) but displays a black screen, a TV where smart features are non-functional while basic display still works, or HDMI ports that stop being recognized.
Sourcing the BN94-18259W
- New OEM: Samsung Parts Direct — most expensive option but guaranteed genuine
- Used/refurbished: eBay, Amazon third-party sellers, BuySpares, and TV repair parts resellers — used boards are significantly cheaper and are the standard approach for out-of-warranty TV repairs
- Part number variants: search ‘BN94-18259W’, ‘BN94 18259W’, and ‘BN9418259W’ — all refer to the same part and may appear differently in different listings
Replacing the BN94-18259W
Main board replacement on a Samsung TV typically involves removing the back panel (screws around the perimeter), disconnecting all ribbon cables and wire harnesses from the existing board, and reversing the process with the replacement board. The main board is mounted with screws to the TV chassis. The critical steps are photographing all cable connections before disconnecting them and noting the orientation of each ribbon cable connector, since incorrect reassembly will prevent the TV from functioning.
Main board replacement is within the capability of a careful DIY repairer comfortable with electronics. The risk of damaging the panel or other boards is low as long as ribbon cable connectors are handled gently — the locking mechanisms on these connectors are the most fragile part of the process.
Samsung BN96-44184A
The Samsung BN96-44184A is a T-Con board (Timing Controller) — the board responsible for converting the processed video signal from the main board into the precise timing signals needed to drive the individual pixels on the LCD panel. T-Con board failures produce very specific visual symptoms that make them relatively easy to diagnose.
T-Con board failure symptoms
- Horizontal or vertical lines running across the entire screen
- One half of the screen appears dark while the other half displays normally
- The image appears scrambled, shifted, or broken into blocks even though the backlight is clearly illuminated
- A ‘negative’ image or inverted colors across part or all of the screen
These symptoms are distinct from main board failures (which cause no image at all) and from backlight failures (which cause a dim image visible under strong side lighting). Confirming the T-Con as the likely failure before ordering is important since T-Con boards are panel-specific — a BN96-44184A that works in one Samsung model may not be electrically compatible with a different model even if the connector looks similar.
Samsung TV Power Supply Board
The power supply board (part numbers beginning BN44-XXXXX on Samsung TVs) converts the mains AC power into the DC voltages required by the main board, T-Con, and LED driver. Power supply failures are among the most common Samsung TV faults, particularly on TVs 5-10 years old, and produce distinctive symptoms:
- TV clicks repeatedly at startup without turning on — the power supply is attempting to start but shutting down due to a failed capacitor or protection circuit
- Standby light blinks in a specific pattern — Samsung TVs use blink codes on the standby LED to indicate specific power supply fault conditions
- TV turns on but shuts off again after 5-30 seconds
Power supply boards are the most cost-effective Samsung TV repair since they are standardized across many models, inexpensive to source, and visually diagnosable in some cases — a failed electrolytic capacitor on a Samsung TV power supply sometimes shows visible bulging or leakage at the top of the capacitor, confirming the failure without requiring electrical testing.
Samsung TV LED Backlight Repair
LED backlight failures are one of the most common reasons for a Samsung TV to display a dark or partially dark picture. The symptoms are specific: the TV powers on, you can hear sound, and when you shine a flashlight at the screen at an angle you can see a very dim image — this confirms the panel and main board are working but the LED strips are not illuminating.
Diagnosing LED vs power supply vs T-Con
- Dim picture visible only with flashlight = LED backlight failure (strips or LED driver board)
- Half screen dark, other half normal = T-Con board failure
- No picture, no sound, no standby light = power supply failure
- Standby light on, no picture, sound works = main board or T-Con failure
LED strip replacement involves removing the TV panel, which is the most technically demanding Samsung TV repair. The panel must be carefully separated from the chassis, the diffuser sheets removed, and the LED strips accessed at the back of the panel cavity. Many TV repair shops offer LED strip replacement as a standard service since the parts cost is low relative to the panel cost.
Samsung Syncmaster 172X and Older Monitor Parts
The Samsung SyncMaster 172X is a 17-inch LCD monitor from Samsung’s early-2000s lineup, and searches for it in 2026 are typically from users looking for a power adapter, replacement capacitors for a failed power board, or an image of the monitor for nostalgia or documentation purposes. Parts for monitors of this age are rarely available as OEM components from Samsung — the practical sourcing options are eBay for used complete units or donor monitors, and electronics component suppliers like Digi-Key or Mouser for individual capacitors if the specific failed component can be identified.
Where to Buy Samsung TV Parts
| Source | Best For | Notes |
| Samsung Parts Direct | New OEM parts for current models | Most expensive; guaranteed genuine |
| eBay | Used/refurbished main boards, T-Con, power supplies | Largest used parts marketplace; check seller ratings |
| Amazon third-party | Used and aftermarket boards | Wide selection; read product descriptions carefully for model compatibility |
| BuySpares / RepairClinic | New and aftermarket parts by model number | Good for confirming model compatibility before ordering |
| Local TV repair shops | Main board and power supply swaps | Labor cost offset by not needing to do the repair yourself |
Always confirm the part number against your TV’s model number before purchasing. The Samsung TV model number is printed on a label on the back of the TV, and the specific board part numbers are printed directly on the boards themselves — photographing the boards before disassembly gives you the exact part numbers for sourcing.
For Samsung TV model-specific part diagrams and compatibility lookup, see Samsung Parts Direct TV parts. For used Samsung TV boards and third-party parts, see eBay Samsung TV parts.
Diagnosing a Samsung TV Before Ordering Parts
The biggest mistake in Samsung TV repair is ordering parts before diagnosing — main boards, T-Con boards, and power supplies are all non-returnable once opened, and ordering the wrong board wastes money without fixing the TV. A systematic diagnosis takes 15 minutes and can save significant cost.
• Step 1: Connect the TV to a known-good HDMI source and confirm whether the TV shows any picture at all — no picture on any input narrows the fault to the main board, T-Con, or power supply
• Step 2: With the TV on, shine a bright flashlight at an angle to the screen — if you can see a very dim image, the backlight has failed; if you see nothing at all, the panel or T-Con may have failed
• Step 3: Listen for audio — if you hear sound but see no picture, the main board is likely intact and the fault is in the display path (T-Con or backlight)
• Step 4: Check the standby light behavior — most Samsung TVs use a blinking standby LED pattern to indicate power supply fault codes; count the blink pattern and cross-reference with Samsung’s service documentation for your model
Samsung TV One Connect Box Faults
Premium Samsung QLED and Neo QLED TVs use the One Connect Box — an external unit that houses all HDMI inputs and processing electronics, connected to the TV by a single cable. When input issues arise on these models, the One Connect Box itself is sometimes the failed component rather than the main board. Symptoms specific to One Connect Box failure include loss of signal on all inputs simultaneously, an intermittent ‘no signal’ message despite known-good sources, or the TV failing to recognize the One Connect box at startup.
One Connect Box replacements are available as standalone units and are a simpler swap than main board replacement since the cable connection is the only interface between the box and the TV panel. Confirming your specific One Connect Box part number from the label on the unit before ordering is essential.
Samsung TV Software Issues vs Hardware Faults
Before opening your Samsung TV for board-level repair, it is worth ruling out software faults that can mimic hardware failures. A Samsung TV factory reset resolves issues that appear to be hardware problems in a significant proportion of cases — particularly smart TV features not working, apps crashing, and occasionally HDMI input detection issues.
• Factory reset via settings: Settings > General > Reset > enter PIN (default 0000)
• Factory reset without remote (hard reset): with the TV powered off, press and hold the physical power button on the TV (usually under the center of the screen or on the side) for 10-15 seconds until the TV restarts
• Software update: Settings > Support > Software Update — sometimes resolves input or smart feature issues without any hardware intervention
Repairing vs Replacing an Older Samsung TV
The economics of Samsung TV board repair depend primarily on the TV’s age and the cost of the replacement part relative to the TV’s current resale value. As a general guide:
• If the replacement board costs less than 30% of a comparable new TV’s price: repair is typically economically worthwhile
• If the board costs 50% or more of a new comparable TV: consider replacing the TV, particularly if the panel is also damaged or if multiple boards have failed
• Panel damage (cracks, pressure damage, dead pixels in clusters): panel replacement is rarely economical since replacement panels often cost as much as a new TV
Samsung TV board repair is one of the more accessible electronics repair projects for careful DIY enthusiasts — the parts are widely available, the connections are standardized ribbon cables and wire harnesses, and a successful main board or power supply swap can extend the life of a TV by several years at a fraction of replacement cost.
Use the diagnostic sequence above before ordering any parts, and confirm part numbers directly from the boards in your specific TV rather than relying solely on model number compatibility lists.
Related Guides on TechPlayGuide
For more Samsung guides, see our Samsung vs Sony vs LG TV comparison guide.
For more Samsung guides, see our Samsung Galaxy tips and troubleshooting.
Bottom Line
| BN94-18259W | Samsung TV main board — controls smart OS, HDMI inputs, audio/video processing |
| BN96-44184A | Samsung T-Con board — controls LCD pixel timing; lines/half-dark screen symptoms |
| Power supply (BN44-XXXXX) | Clicking at startup, blink codes, auto-shutdown — check capacitors visually first |
| LED backlight failure | Dim image visible only with flashlight — strips or LED driver board |
| Best used parts source | eBay with seller ratings checked; verify part number against TV model label |
| Most common DIY repair | Power supply or main board swap — both accessible with basic tools |
Frequently Asked Questions
What does the Samsung BN94-18259W do?
The Samsung BN94-18259W is a main board used in certain Samsung TV models. It controls the TV’s smart operating system, processes HDMI and other input signals, manages audio output, and communicates with all other internal boards. Main board failures typically cause a TV that powers on but shows a black screen, or smart TV features that stop functioning.
How do I find the right Samsung TV part number?
The part number for each Samsung TV board is printed directly on the board itself. Photograph all boards before disassembly to capture the part numbers. Your TV’s model number, printed on the label on the back of the TV, can also be used to look up compatible part numbers through Samsung Parts Direct or TV repair parts suppliers.
What does the Samsung BN96-44184A do?
The Samsung BN96-44184A is a T-Con (Timing Controller) board that converts the processed video signal into timing signals for the LCD panel’s pixels. T-Con failures produce distinctive visual symptoms: lines across the screen, one half of the screen dark, or scrambled image with the backlight clearly working.
Why does my Samsung TV click on and off?
A Samsung TV that clicks repeatedly at startup without fully turning on typically has a failing power supply board. A failed or bulging electrolytic capacitor on the power supply board is one of the most common causes. The power supply can be visually inspected for bulging capacitor tops without electrical testing — bulging or leaking capacitors confirm the fault.
Where can I buy used Samsung TV boards?
Used Samsung TV main boards, T-Con boards, and power supply boards are most widely available on eBay from TV parts resellers. Amazon third-party sellers also carry used Samsung TV boards. Always verify the specific board part number against your TV’s model to confirm compatibility before purchasing.
