FAQ
TL;DR: Fix an LED1905V3 stuck on the Manta logo by validating rails (stat: U4 measured 1.57 V) and rewriting the correct SPI image—“Voltage 12V, 5V ok.” [Elektroda, adamo72, post #16750838]
Why it matters: This targets do‑it‑yourself TV repairers who need a fast, low-cost path to recover a boot-locked Manta set.
Quick Facts
- Mainboard: HK-T.RT2957E01; panel: MV185WHB-N10 (5 V). [Elektroda, adamo72, post #16750838]
- Typical measured rails: 12 V and 5 V present; U6/U11 ≈ 3.33 V. [Elektroda, adamo72, post #16750838]
- Observed fault: boots to logo, no key response. [Elektroda, adamo72, post #16737285]
- This board uses one SPI flash; no extra TSOP48 flash fitted. [Elektroda, kazikszach, post #16763801]
- Wrong USB image can trigger solid color cycling (red/green/blue test). [Elektroda, adamo72, post #16750838]
Why does my Manta LED1905V3 freeze on the logo after power on?
The mainboard powers up but stops at boot because the SPI flash contains bad or mismatched firmware. Rails check out (12 V, 5 V), yet the set ignores buttons. This points to a software lock rather than a power fault. Reflashing the correct SPI binary is the typical fix for this symptom. [Elektroda, adamo72, post #16737285]
How do I confirm the power rails before touching firmware?
Measure at the stabilizers and coils: 12 V and 5 V present, U6 ≈ 3.33 V, U11 ≈ 3.33 V. Also note U4 around 1.57 V on a working board from the thread. Stable rails rule out a PSU issue and justify firmware work next. [Elektroda, adamo72, post #16750838]
Does the HK-T.RT2957E01 board have only one flash memory?
Yes. This revision carries a single SPI flash device. There is no separate TSOP48 flash on the board. That means the bootloader and main software reside in the same SPI chip, so one wrong image can stall the entire boot. [Elektroda, kazikszach, post #16763801]
What does it mean when the TV shows cycling red/green/blue screens after USB install?
That pattern signals an incompatible or service test image was loaded via USB. The set enters a color test loop instead of completing Android/OS boot, confirming the image did not match the hardware configuration. Restore the proper SPI dump to return the TV to its prior state. [Elektroda, adamo72, post #16750838]
Can I use an install.img from Manta LED2206 to fix LED1905V3?
Avoid it. Flashing the LED2206 image produced only color-cycle screens and no recovery. It did not resolve the logo freeze. Use a model-correct SPI binary for LED1905V3 instead of cross-model USB images. [Elektroda, adamo72, post #16750838]
A tech said “100% load on the disc.” What does that imply here?
It’s shorthand for a firmware-side failure: the SPI flash holds boot and OS content, and a bad load blocks startup. As one expert put it, “100% load on the disc,” meaning the fault lives in the flash contents, not power. Reflash the SPI with a matching dump. [Elektroda, Lukinx, post #16763686]
How can I verify the exact mainboard and panel before flashing?
Check silkscreen for HK-T.RT2957E01 and note the panel sticker MV185WHB-N10 (5 V). Record these IDs before selecting firmware. Mismatched panel timing tables or tuner configs often cause boot or scanning issues after cross-flashing. [Elektroda, adamo72, post #16750838]
Is a SPI dump from a different Manta model a viable workaround?
It may boot but expect mismatches. A 2802 dump on a different chassis started the set, but keys remapped and the tuner found no channels. That shows cross-dumps can prove a software fault yet remain unusable for daily viewing. [Elektroda, adamo72, post #16752333]
How do I reflash the SPI to recover a logo-locked TV?
- Desolder or clip onto the SPI (SOIC-8) on HK-T.RT2957E01.
- Program a known-good LED1905V3 dump; verify after write.
- Refit, power up, and test panel and keys.
This restores boot control if rails are good. [Elektroda, adamo72, post #16750838]
What symptoms confirm a tuner or keymap mismatch after cross-flashing?
The TV may power up, but front-panel buttons act wrong and channel scans find no programs. That indicates the dump’s key matrix and tuner profiles do not match your board’s hardware. Replace with the correct model image. [Elektroda, adamo72, post #16752333]
What happens if someone powers the set with 24 V by mistake?
A case in the thread shows a 24 V feed burned the inverter input. The SPI remained readable, and the TV had worked before that incident. This edge case proves over-voltage can damage power sections while leaving flash contents intact. [Elektroda, kazikszach, post #16751098]
What is SPI flash in this context?
SPI flash is an 8‑pin serial memory that stores the TV’s bootloader, logo, and OS data. On HK‑T.RT2957E01 it’s the only firmware store. Corruption or mismatch of this chip stalls boot at the logo screen. Reprogramming restores function. [Elektroda, kazikszach, post #16763801]
What is a TSOP48 flash package, and do I need to read it here?
TSOP48 is a larger parallel flash package often used for main firmware on other TVs. In this board family, there is no TSOP48 present to read. Focus on the SOIC‑8 SPI device for dumps and writes. [Elektroda, kazikszach, post #16763801]
When should I stop and return the TV to the customer?
If a correct, model‑matched SPI dump is unavailable or the client declines further work, terminate. The thread case ended with the customer collecting the set after attempts with nonmatching images. Document findings and voltages for transparency. [Elektroda, adamo72, post #16831274]
