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Key points
• Search term that works best: “ELMT6886-FG95 schematic”
• Register (free) at elektroda.com to unlock the PDF (≈18 MB).
• The manual includes block diagram, full circuit, board silkscreen and part-list (BOM).
Hardware identity
• TV model: LEDTV50A1T2 (50 ″, 4K UHD, DVB-T2).
• Chassis code: ELMT6886-FG95.
• Main board: TP.MS6886.PB765(T) – Mediatek/Guoxin MSD6886 SoC.
• PSU / LED-driver: integrated board PLTVFY341X(A) (24 V & 12 V rails + boost LED rail).
• T-CON: V500QVE-K02 (for Innolux V500DJ6-QS5 panel).
What the official schematic provides
• Complete circuit for the SMPS (PFC + LLC resonant converter).
• LED boost driver based on BP1622 (or OB3350) with open/short protection.
• Main board power tree: 5 V-SB, 3 .3 V, 1 .8 V, 1 .1 V core, HDMI ESD network.
• LVDS/T-CON interface pin assignments.
• UART factory port and ISP pads for MSD6886.
Typical failure patterns on this chassis
• “No power” – primary MOSFET QP02 short or startup cap CP19 (4.7 µF/50 V) dry → no 5 V-Standby.
• “Logo → restart loop” – eMMC corruption on MSD6886 (replace IC or re-flash with off-board programmer).
• “Sound, no back-light” – open LED string (measure boost rail, normally 100–110 V).
• “Half image / vertical bars” – V500QVE-K02 T-CON gamma IC AS15-F defect.
How to work without the proprietary file
a. Trace PSU first; verify 5 V-SB present.
b. Short-ON test: bridge PS-ON to GND; bridge BL-ON to 3.3 V; measure 24 V & LED rail.
c. On main board, check LDO regulators: U5 (RT9193-33), U7 (AMS1117-1.8), U11 (SY8008-1.1).
d. For SoC fault isolation, connect USB-TTL 3.3 V to UART header (Tx0/Rx0) and read boot log.
Latest data gleaned from 2023-2025 repair forums:
• MS6886 platform is being superseded by RTD2851/RTD2853 and Mediatek MT9602, but boards and parts remain stocked in Chinese wholesale markets (LCSC, Aliexpress) through 2026.
• Several hobbyists have produced open-source boardviews for TP.MS6886.PB765, simplifying rework.
• Firmware image packs (USB upgrade) are hosted at tvfirmware.com (>2024 revision fixes DVB-T2 freeze).
Potential future developments
• Shift to unified USB-C PD power entry in 48–55 ″ TV designs; PSU schematics will change accordingly.
• Wider adoption of mini-LED back-light → higher-voltage constant-current drivers (200–350 V).
Block-level architecture (simplified):
AC 90–264 V
│
PFC + LLC ──► 24 V / 4 A ──────► Main Board DC-DC ──► 3 .3 V / 1 .8 V / 1 .1 V
│ │
└─► 12 V / 2 A ──► T-CON ───┘
│
└─► Boost 90–120 V → LED strings (10S-8P)Key test points (from schematic):
• TP5 – 5 V Stand-by (present at all times).
• CN2-Pin4 – PS-ON (3.3 V active high from main board).
• CN2-Pin6 – BL-ON (back-light enable).
• TP18 – FB of LED driver (0.3 V typical, varies with brightness PWM).
• Schematics are ESTAR intellectual property; downloading is legal for repair in many jurisdictions (“right-to-repair”), but redistribution may infringe copyright.
• Always work with isolation transformer and discharge the primary capacitor—PSU carries >400 Vdc.
Obtaining the file
Field repair best practices
• Use a 60 W temperature-controlled iron and hot-air station (280 °C for BGA reflow).
• For LED strip test, use a 0-300 V current-limited tester at ≤30 mA.
• Replace eMMC with Kingston KE4CN2H5A BGA153; program via BSL UART or SD-card jig.
Potential challenges
• BGA rework on MSD6886 requires pre-heater; risk of PCB warping.
• Fake replacement power boards—verify PFC coil presence and UL marks.
• PDF on Elektroda occasionally misses silkscreen layer for PSU; cross-check with photo.
• Board variants PB765 vs PB761 may differ in tuner (R848 vs R850) but schematic lines are identical.
• If TV uses different screen (e.g., CSOT ST5461D05), T-CON diagram will not match exactly.
• Compare the ELMT6886-FG95 PSU with PLTVEY431X (Hisense 50A7100) – same topology.
• Study Mediatek MSD6886 datasheet (leaked on w55.ir) for deeper software-level debugging.
• Investigate open-source RTOS replacement (Open-VFD or rOpenATV) for this SoC family.
Recommended resources
• “Troubleshooting LED TV Power Supplies” – EEVblog tutorial #1121.
• Mediatek Linux BSP for MTK6886 – github.com/torvalds/linux/tree/mtk_drm_6886 (community port).
The schematic for the ESTAR LEDTV50A1T2 (ELMT6886-FG95) is obtainable from the Elektroda forum; failing that, any service manual for the TP.MS6886.PB765(T) main board or MSD6886 reference design will give you the necessary circuit details. With that document you can check the usual weak spots—5 V standby supply, LED boost driver and SoC power rails—and carry out component-level repairs safely.