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Key points
• Identify the panel model/resolution first.
• Download the correct firmware variant from a trusted repository.
• Follow the USB-flash sequence strictly; never interrupt power.
• Wrong firmware ⇒ distorted/no image, or a bricked main-board.
Board architecture
• TP.SIS231.PT85 integrates PSU, LED-backlight driver, tuner, and main SoC (SiS231).
• External SPI NOR flash (usually Winbond 25Q64, SOIC-8) stores the firmware.
• The firmware also holds the “panel map” (LVDS timing table); that is why panel matching is mandatory.
Typical failure scenarios
• Endless boot-loop / logo freeze (corrupted flash).
• After main-board replacement, image garbled because default firmware does not match the original panel.
• Blank screen after lightning / brown-out; boot-loader still alive but application corrupted.
Firmware variants
Resolution buckets most commonly encountered:
▫ 1366 × 768 (HD, 6-bit LVDS)
▫ 1920 × 1080 (FHD, 8/10-bit, 8-lane or 12-lane)
Less frequent: 1280 × 720, 1600 × 900, 1280 × 1024.
Each variant embeds: backlight PWM settings, LVDS swapAB, mirror, panel voltage (5 V/12 V).
Mismatch symptoms: mirror/invert, colour solarisation, split screen, or complete blackout with backlight on.
Identifying the correct firmware
a) Disassemble rear cover, read the sticker on the LCD cell (e.g. V420H2-L04, LC320WXE-SBV1).
b) Note native resolution and LVDS bit-depth.
c) Search repositories with pattern:
“TP.SIS231.PT85 + panel-model” or “TP.SIS231.PT85 1920x1080 firmware”.
d) Prefer dumps uploaded from a working TV with identical panel; verify CRC/size.
Flashing procedure (USB method)
If the boot-loader is corrupted or the TV does not enter USB mode, use an external SPI programmer (CH341A, RT809H) to write the .bin directly to the 25Q64.
Online repositories (checked 2024-Q2)
• https://www.elektroda.com/qa,tpsis231pt85-firmware-flash-panel-match.html – thread with multiple dumps per resolution.
• https://www.teckwiki.com/tp-sis231-pt85-firmware-download – curated table, last update Feb-2024.
• https://www.kazmielecom.tech/tp-sis231-pt85-software – mirror links plus flashing tutorial.
• ReceiverPro.net and kenotrontv.ru host less common panel combinations.
Industry trend: many service shops now keep a private database of verified dumps to avoid counterfeit-virus-injected files circulating on file-sharing hosts.
Future direction: newer universal boards (e.g., TP.RT298X) have dual-partition secure boot and simplified OTA updates; legacy SIS231 boards will remain field-serviceable only via USB/SPI.
• Why rename to “SIS231.bin”? – the first-stage boot-loader (hard-coded in ROM) scans the USB root for this filename to verify signature and address mapping.
• Hidden service menu (Menu + 1147 → Balance 0 → 1969) allows LVDS flip and backlight table tweaks if minor mismatch remains.
• Panel power (5 V vs 12 V) is selected by firmware GPIO table; wrong value may blow the panel fuse – verify with DMM after flashing.
Example: 32" TV, panel LTA320AP02 (1366 × 768).
Correct bin: “TP.SIS231.PT85_32_HD_5V_AP02.bin” 6 346 752 bytes.
After flash, enter service menu, confirm: PanelType = LTA320***, VccPanel = 5 V, LVDSMap = JEIDA.
• Firmware images can be under copyright of the original TV OEM; redistribution is tolerated in the repair community but may violate EULAs.
• Some download portals embed adware or request payment despite the files being freeware – verify checksums, scan for malware.
• Safety: mains-powered board, risk of electric shock; disconnect AC before any disassembly.
Best practices
• Photograph jumper positions and cable routing before disassembly.
• Keep a backup of the original SPI content if it is still readable (CH341A “READ” before “ERASE”).
• Use an isolation transformer when powering the open chassis on the bench.
Potential challenges
• USB stick not recognised – use older 2 GB–4 GB models, no U3 partition.
• Flash fails at 4 % – indicates bad block or 25Q64 worn out; replace IC and re-program externally.
• Picture negative/inverted – open service menu, toggle “Mirror” or “SwapAB”.
Verification
• Connect pattern generator or HDMI laptop, run colour bars, check for clipping and gamma shifts.
• Measure 12 V/5 V rails for ripple (< 100 mVpp) – excessive ripple can corrupt future boots.
• Universal boards differ by revision (silkscreen A, B, C). Firmware sometimes cross-compatible, but RS-232 pin-out or remote codes may change.
• If you cannot find a perfect match, replacing the main-board with a pre-programmed one (~20 € on AliExpress) may be faster than iterative flashing.
• Develop a local library of verified dumps indexed by panel model for future repairs.
• Explore open-source utility “PanelScan” to read EDID over LVDS and auto-select firmware (experimental).
• Monitor forums for any SiS231 secure-boot exploits that could allow selective partition rewriting instead of full-flash dumps.
Recommended reading
• Badcaps forum thread “Chinese combo-board firmware 101”.
• PDF schematic “Power-supply TP.SIS231.PT85” (Scribd link).
• Application note “SiS231 LVDS interface configuration”.
To update/restore a TP.SIS231.PT85 board you must:
