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Below is a failure-tree distilled from Samsung service manuals, field‐returns, and community repair statistics for the D6100 platform.
Power / “won’t start”, red LED blinks, relay clicks
• Weak electrolytic capacitors on BN44-00458A (especially 450 V-68 µF bulk and 3.3 V stand-by rail).
• PS_ON not asserted – firmware crash or BGA fracture on main board.
• Secondary-side MOSFET Q9101/Q9102 short ⇒ fuse opens, no standby.
Sound present, screen black (flash-light test shows faint image)
• One or more edge-LEDs open → LED string opens → driver shuts down.
• Driver section (IC9xxx, typically OZ9966 or MP3394) on PSU open-circuit.
• Back-light enable (BL_ON) missing from main board.
Intermittent lines / colour solarisation / double image
• T-Con gamma IC AS15-F drift (heat-related, Vgamma rails >±0.2 V off spec).
• Oxidised LVDS cable or bad press-fit connectors.
• COF (chip-on-film) bond lift on LCD glass – usually vertical one-pixel-wide lines, unrepairable.
Random shut-down after minutes of operation
• Over-current flag from LED driver – incipient LED failure.
• Voltage regulator ICs on main board overheating (linear LDOs near Wi-Fi header).
• Firmware loop caused by SAMSUNG SMART HUB certificates (now deprecated) → endless reboots.
HDMI / port failures
• ESD damage to Silicon Image TMDS receiver; test by swapping to HDMI3 (different silicon).
• Dry joints on 100-pin HDMI switch IC; re-flow often restores operation.
Theoretical foundations: the set uses a multi-rail switched-mode PSU that supplies 13 V, 5.3 V and a constant-current LED rail (≈110 V). Main board issues are often BGA or NAND-flash corruption; T-Con controls VGH ≈ 28 V, VGL ≈ –9 V, VCOM ≈ 7 V; any drift wreaks havoc on gray-scale linearity.
Practical applications: replacing a few 105 °C capacitors or an AS15-F usually extends life by >5 years; full LED-strip replacement resets the thermal clock.
• Replacement boards are still stocked by AliExpress, eBay and EU surplus houses as of 2024; complete PSU BN44-00458A averages €35–45.
• LED retro-fit kits with series-parallel topology (runs at 36–72 V) allow you to bypass the original driver and reduce future failures.
• Enthusiast firmware (SamyGO) can unlock PVR, DTS, extended codec support, but development is stagnant; proceed only if you need those features.
• Streaming apps for 2011 Smart-Hub are obsolete; external HDMI streamers (Roku, Fire TV, etc.) are the industry norm for legacy sets.
Why capacitors fail: original Samwha WL-series bulk caps are rated 105 °C/2 k h but run close to 90 °C due to convection-limited chassis → rapid ESR rise.
LED failure mode: sulphidation of silver glue pads and electromigration increases forward voltage of one diode; current regulator hits OVP and blanks entire string.
Gamma IC ageing: AS15-F uses tiny internal reference capacitors; leakage increases, shifting Vgamma staircase and causing posterisation (“solarised skin tones”).
• Mains-powered SMPS contains >325 Vdc on primary bulk cap – discharge safely.
• In most jurisdictions (EU Low Voltage Directive, IEC 60065/62368-1) only certified personnel may service TVs that are to be returned to customers.
• Re-use of leaded solder or BGA reflow must follow local RoHS/WEEE disposal rules.
• Always erase or safeguard user-data (Wi-Fi keys, app log-ins) if you resell or scrap the main board.
Potential challenges and work-arounds
• Removing the 46" glass: two-person job, antistatic gloves, rigid surface.
• LEDs glued with double-sided tape; use low-heat hot-air (<120 °C) to soften.
• AS15-F is 48-pin TQFP with 0.5 mm pitch; use hot-air at 310 °C, pre-heat to 120 °C.
• After 13 years, plastic diffusers may yellow; replacing LED strips may shift white-point.
• No firmware update after 2014 – some built-in apps now fail TLS hand-shake; cannot be fixed without replacing main board with “E” series variant.
• Very rare but documented: panel tab bond failure causing intermittent vertical half-screen; economically irreparable.
• Read Samsung Training Manual “LED TV Troubleshooting 2011-2012 (BN97-06022A)”.
• Community database badcaps.net → search thread “UE46D6100 blinking”.
• Study AN-1408 (OnSemi) on constant-current LED drivers for retro-fit design.
• Investigate open-source SamyGO forums for extended service-menu functions.
The Samsung UE46D6100 is an early-generation 46″ 3-D Smart-TV whose most common failures are PSU capacitor ageing, LED-back-light outages, and T-Con gamma drift. All major boards are still purchasable in 2024, and most faults can be repaired at component level with standard tools. Identify your exact symptom, follow the rail-by-rail diagnostic sequence, observe safety regulations, and you can usually restore full functionality or decide quickly if the panel itself is beyond economic repair.
