FAQ
TL;DR: Forum search shows 50 matches; "Start by checking the backlight." UE32D5500 with 5 blinks needs LED-line and mainboard isolation checks before suspecting firmware. This quick FAQ helps repairers diagnose no-sound/no-remote cases fast. [Elektroda, lisek, post #17311019]
Why it matters: It speeds up triage for Samsung D‑series techs facing 5‑blink, no‑audio, no‑control faults.
Quick Facts
- Five LED flashes are linked to backlight/LED-line faults; inspect strips, drivers, and dimming first. [Elektroda, lisek, post #17311019]
- Mainboard identified in this case: BN41-01660B; prioritize board-level checks if backlight passes. [Elektroda, mkpl, post #17315552]
- PSU variants in this chassis family: BN44-00460A (PD32AF_BSM / PSLF800A03C). [Elektroda, mirex, post #17315658]
- Reported rails after the 6 V converter: 9 V, 5 V, 2.4 V, 1.2 V; SEMS21 ~55°C during startup. [Elektroda, mkpl, post #17310794]
- NAND reprogram/replace often fixes boot faults; “start with this” on these mains. [Elektroda, GanCegall, post #17316999]
What does 5 LED blinks on a Samsung UE32D5500 indicate?
On Samsung D‑series, five flashes commonly accompany backlight or LED-line issues. Inspect LED strips, drivers, and PWM_DIM control. “Start by checking the backlight.” If LEDs test fine, proceed to isolate mainboard and panel logic. This sequence avoids chasing false leads from blink counts alone. [Elektroda, lisek, post #17311019]
How common is this UE32D5500 startup fault?
It appears often in community reports. A forum search returned 50 matches for “UE32D550,” indicating recurring cases with similar startup symptoms. Use that as a signal to follow a proven triage path: backlight first, then mainboard and firmware checks. [Elektroda, lisek, post #17311019]
How do I force the backlight on to test it?
Use this quick test:
- Disconnect the mainboard harness from the PSU, then apply AC power.
- The backlight should light fully if LED strings and PSU are healthy.
- Alternatively, isolate PWM_DIM from main to stop dimming during the test.
This isolates backlight from mainboard control. [Elektroda, mirex, post #17311676]
What should I expect if I unplug the mainboard from the PSU?
The backlight should illuminate at full brightness. That outcome indicates the LED strings and the PSU’s LED driver are operational. You can then refocus on mainboard or panel logic as the fault source. This is a fast, low‑risk isolation check. [Elektroda, mirex, post #17311676]
Should I disconnect the T‑CON/LVDS to isolate the panel side?
Yes. Unplug the panel logic (T‑CON) from the mainboard and power on. This checks for surprises from the panel side. If the mainboard is healthy, the TV should behave normally aside from no image. Keep the PSU connected for this test. [Elektroda, mirex, post #17312054]
Backlight works but theres no sound, no image, and no remote response—what now?
Focus on the mainboard BN41‑01660B. A frequent remedy is to reprogram or replace the NAND flash that holds firmware. Start with NAND work before sourcing a replacement mainboard. This approach often restores boot and control functions. [Elektroda, GanCegall, post #17316999]
Is NAND flash corruption a known issue on this board?
Yes. Experienced techs report this as “one of the most common problems with this album.” Symptoms include boot loops, stuck logos, or dead control with brief backlight activity. Address the NAND before deeper hardware swaps to save time. [Elektroda, zdzich42, post #17317100]
Can I reprogram the original NAND instead of replacing it?
Yes. “You can reprogram the old one and it will be ok.” Many shops reflash the existing NAND with known‑good firmware dumps. If the chip is physically bad, replace it and program off‑board. This minimizes unnecessary board replacements. [Elektroda, GanCegall, post #17316999]
What is the mainboard part number I should search for?
BN41‑01660B is reported for this UE32D5500 case. Use that identifier when sourcing a donor or when requesting firmware/NAND images. Verify the full suffix on your board for compatibility. [Elektroda, mkpl, post #17315552]
Which power supply board is used with this model?
BN44‑00460A appears in this chassis family, also labeled PD32AF_BSM or PSLF800A03C. Confirm the sticker on your PSU for the exact variant before swapping parts. Matching revisions helps avoid connector or current rating mismatches. [Elektroda, mirex, post #17315658]
What rails and temperatures confirm the mainboard is at least powering?
Reported measurements after the 6 V converter include 9 V, 5 V, 2.4 V, and 1.2 V linear regulators. The SEMS21 SoC around 55°C shortly after power‑on is observed and considered typical here. These signs indicate the board powers but may not boot. [Elektroda, mkpl, post #17310794]
My remote doesnt work but side buttons toggle power—does that implicate the mainboard?
Yes. In this case the TV only reacted to the local keyboard, showed five LED blinks, and then went dark. There was no sound or input changing. That behavior aligns with a mainboard that powers but fails to run properly. [Elektroda, mkpl, post #17311973]
Do Samsung blink counts map to specific fault codes?
No. “The ‘flashing’ of the diode is irrelevant in Samsung.” Treat the five blinks as a hint, not a diagnostic code. Use isolation tests and voltage checks to locate the actual fault domain. [Elektroda, zdzich42, post #17317100]
I see LVDS activity only on EVEN TX4 and ODD TX4; is that useful?
Limited LVDS activity matches a no‑image condition. It suggests the panel is not being fully driven. Combine this with the LVDS unplug test to decide if the mainboard or panel logic is at fault. [Elektroda, mkpl, post #17310794]
The backlight turns on then quickly dims—does that fit this fault profile?
Yes. The described startup shows full backlight that dims to minimum while the set remains unresponsive. That fits a scenario where the mainboard fails to sustain enable or PWM control after initial power‑up. [Elektroda, mkpl, post #17310794]
