TCL QM7 QD-Mini LED Google TV (QM751G, 2024): quick sheet

Covers: TCL QM7 (2024) Google TVs: 55QM751G, 65QM751G, 75QM751G, 85QM751G, 98QM751G. Replaced by the QM7K (2025); check the model letter before ordering boards.

Cross-checkedBrands: TCL3 components

Mid-range mini-LED with a 120 Hz panel that accepts up to 144 Hz VRR, Google TV, Dolby Vision and HDR10+. Up to 1,500+ dimming zones depending on size (RTINGS counted 1,248 on the unit it tested). Mini-LED repair blocks: power board, LED driver, mini-LED backlight boards, main board.

Safety first

Unplug and wait before opening.
Two-person handling for 65 in and up; the 98 in needs a team and proper lifting.
Live tests on power board or LED driver are caution work.

How it works

Power board feeds the main board (Google TV, HDMI) and the LED driver; the main board sends zone dimming data to the backlight.

Mini-LED zones sit behind the diffuser; a dead zone shows as a dark block on a white field, and blooming around bright objects is normal behavior, not a fault.

144 Hz is a VRR ceiling for PCs/consoles, not the panel's fixed refresh rate.

Components & tests

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Official manufacturer documentation

Always confirm values against the tech sheet for the exact model.

OnCall Tech is a reference tool for trained technicians and can make mistakes. Always disconnect power and confirm with the manufacturer's documentation before you work. © 2026 OnCall Tech. Original content; not a reproduction of any manufacturer document.Generic part photos (not of this brand): LCD TV with the panel removed, showing the grid of lit LED backlights by RobertKuhlmann, CC BY-SA 3.0

Diagnostic guides for this appliance

Guide · TV

TVs: standby LED blink patterns, why they are model-specific, and how to use them

Some makers use the standby LED as a self-diagnosis output. Sony, for example, repeats a group of blinks with a pause, and the count names a fault area. The meaning of a count depends on the maker and the chassis, so one model's table does not apply to another. Samsung's support simply says that if the red light still blinks after a power cycle on a known-good outlet, the set needs service. Use the blink only to separate power-delivery problems from internal faults and to point to a board.

6 steps ~20 minmoderate

Guide · TV

TV antenna finds no channels (or loses channels after a scan)

Most antenna problems are setup and signal, not a bad tuner: wrong input or scan type, a loose or damaged coax, an unpowered amplifier, an antenna in a poor spot, a splitter that cuts the signal, or a signal so strong it overloads the tuner. Stations also move or change format, so a rescan is the first step any time channels disappear.

6 steps ~30 mineasy

Guide · TV

TV talks: a voice reads every menu or describes the show

This is an accessibility feature that was switched on, often by accident through a remote shortcut (holding Mute or Volume, or pressing Star several times). A voice reading menus is the screen reader (Voice Guide, Audio Guidance, Screen reader). A voice describing the show is audio description, which may be a TV setting or the streaming app's audio track. Nothing is broken.

5 steps ~10 mineasy

Other tvs manuals

Manual · TV

Samsung Crystal UHD CU8000 / DU7200 / DU8000 (2023-2024): quick sheet

Samsung Crystal UHD 4K LED sets one step above the CU7000: CU8000 (2023, e.g. UN55CU8000FXZA, UN65CU8000FXZA; 43-85 in), DU7200 (2024 retail-channel model, e.g. UN65DU7200) and DU8000 (2024, e.g. UN65DU8000FXZA). Year letter: C = 2023, D = 2024. The 85-inch CU8000 and DU8000 use a different 120 Hz panel with HDMI 2.1 features; do not treat them like the smaller sizes. The basic TU7000/CU7000 have their own sheet.

7 components6 common failuresSamsung

Manual · TV

Samsung Neo QLED QN85 / QN90 Mini-LED (B / C / D, 2022-2024): quick sheet

Samsung Neo QLED 4K mini-LED sets: QN90B/QN90C/QN90D and QN85B/QN85C/QN85D, e.g. QN65QN90CAFXZA, QN65QN90DAFXZA, QN55QN85DBFXZA. Year letter: B = 2022, C = 2023, D = 2024. QN90C sizes 43-85 in; QN90D 43-98 in; QN85C 43-85 in; QN85D 55-85 in. QN90DD / QN90CD are retailer variants of the same series (check the exact suffix before ordering parts).

7 components6 common failuresSamsung

Manual · TV

Samsung The Frame LS03 (LS03B / LS03C / LS03D): quick sheet

Samsung The Frame lifestyle TVs with matte screen and One Connect box: LS03B (2022), LS03C (2023), LS03D (2024), e.g. QN43LS03DAFXZA, QN55LS03DAFXZA, QN65LS03DAFXZA, QN75LS03DAFXZA. Sizes 32 in (Full HD) and 43-85 in (4K). 43 and 50 in are 60 Hz; 55 in and up are 120 Hz.

7 components6 common failuresSamsung