LCD TV with the panel removed, showing the grid of lit LED backlights
6 components covered

Field manual · TV

Sony BRAVIA X90J / X90K / X90L full-array LED: quick sheet

Covers: Sony BRAVIA XR X90J (2021), X90K/X90CK (2022) and X90L/X90CL (2023) 4K full-array LED sets on Google TV.

Single sourceBrands: Sony6 components

Sony's mid-range full-array set with the Cognitive Processor XR. Zone count rose each year (RTINGS measured about 24 on X90J, 54 on X90K and 88 on X90L test units). Field calls: backlight strings, red-LED blink shutdowns, Google TV software hangs and HDMI 2.1 setup.

Safety first

  • Unplug and wait before opening; power-board capacitors hold charge.
  • Powered backlight and power-board tests are caution work.
  • Two-person panel handling.

How it works

Power board, main board (Google TV, XR processor), T-con and a full-array LED backlight with local dimming.

When the set detects an internal fault it shuts down and blinks the red LED; Sony states the meaning varies by model and that most blink conditions need service. Count the blinks and give the count with the model number when ordering parts or calling Sony.

Sony's documented reset ladder: remote restart (hold POWER about 5 s until 'Power off'), menu restart, then a power reset (unplug for 2 minutes), and on some Google TV models holding the set's own POWER key about 40 s.

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

Soundbar won't turn on with the TV, or TV remote won't control its volume (HDMI-CEC)

One-remote control depends on HDMI-CEC over the ARC/eARC cable. Disabled CEC, the wrong HDMI port, an optical connection, a poor cable or a TV update that switched settings off cause nearly all of these calls.

7 steps ~30 mineasy
Guide · TV

Soundbar audio cuts out, pops or drops with movies/Atmos (ARC/eARC)

Dropouts usually come from an unstable ARC/eARC handshake or a format the chain doesn't handle well. Work through cable, firmware, CEC conflicts and the TV's digital audio format; optical is a stable fallback without Atmos.

8 steps ~40 mineasy
Guide · TV

Projector won't turn on or shuts off (reading the indicator lights)

Projectors protect themselves: overheating, lamp at end of life, and lamp-cover interlocks all stop the light source. Read the indicators against the model's table, then fix airflow, lamp seating or lamp life.

6 steps ~30 mineasy

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Samsung QLED Q60 / Q70 / Q80 (2019-2024): quick sheet

Samsung non-Neo QLED (quantum-dot LCD) Q60, Q70 and Q80 series from about 2019 (R) through 2024 (D), Tizen OS. Not the Neo QLED QN85/QN90 mini-LED lines. The letter after the series number is the model year (e.g. Q80R, Q60T, Q80A, Q80C, Q80D as named in reviews).

7 components6 common failuresSamsung
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LG NanoCell (NANO75 etc.) and UHD UQ series (UQ7070 / UQ7570 / UQ8000): quick sheet

LG 4K LED-LCD sets on webOS: NanoCell NANO75/NANO80-class (2021-2023) and UHD UQ7070, UQ7570, UQ8000 (2022) and their UP/UR siblings. Not LG OLED (see the OLED quick sheet).

6 components5 common failuresLG
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Sony BRAVIA A80J / A80K / A80L OLED: quick sheet

Sony BRAVIA XR A80J (2021), A80K (2022) and A80L (2023) WRGB OLED sets on Google TV.

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Sony BRAVIA X90J / X90K / X90L full-array LED: quick sheet · OnCall Tech