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Hisense 55U8HQ User Manual

Hisense 55U8HQ
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LCD Television
Service Manual
Chassis MT9900
Version: V 1.0
Hisense Visual Technology Co.Ltd.
November 19, 2021
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Hisense 55U8HQ Specifications

General IconGeneral
Display diagonal55 \
Native aspect ratio16:9
Tuner typeDigital
Video appsAmazon Prime Video, Chili, Disney+, Netflix
Screen mirroringNo
Apple AirPlay 2 support-
Sound modesDolby Audio
Audio decodersDTS, Dolby Atmos
RMS rated power70 W
Number of speakers2
Stand typeCenter stand
Processor cores4
Image formats supportedBMP, GIF, JPEG, MPO, PNG
High Dynamic Range (HDR) technologyDolby Vision IQ, High Dynamic Range 10 (HDR10), High Dynamic Range 10+ (HDR10 Plus), Hybrid Log-Gamma (HLG)
HDMI version2.0/2.1
Ethernet LAN (RJ-45) ports1
Power consumption (sleep)0 W
Power consumption (standby)0.5 W
Country of originSlovenia
Dimensions (with stand) (WxHxD)1233 x 784 x 30 mm
Dimensions (W x D x H) with stand1233 x 30 x 784 mm
Repairability index6.5
Weight and Dimensions IconWeight and Dimensions
Depth (with stand)300 mm
Width (with stand)1233 mm
Height (with stand)784 mm
Weight (with stand)24500 g
Depth (without stand)77 mm
Height (without stand)874 mm
Weight (without stand)19400 g

Summary

Precautions and Notices

Safety Warnings

Details critical component identification, ESD precautions, and electrical shock prevention measures.

Safe Handling Notes

Provides guidelines for safe handling of LCD panels and during service operations, including workspace and component handling.

TV Boards

Main Board Layout and Wiring

Illustrates the top and rear views of the main board, including connector labels and wiring diagrams.

TV Boards Part List

Lists main board part numbers and their functional differences across chassis types and series.

Factory/Service OSD Menu and Adjustment

Remote Control Overview

Details functions of buttons on the TV remote control, including standard and special function buttons.

Factory OSD Menu Details

Explains various factory settings, version information, key management, and options like EEPROM reset.

Software Upgrading

USB Upgrade Procedure

Step-by-step guide for upgrading TV software using a USB disk in user or factory modes.

Flash Tool Upgrade Procedure

Instructions for upgrading firmware using a PC-based Flash Tool via serial port connection.

Trouble Shooting

Remote Control Issues

Flowchart for diagnosing and resolving problems with the TV remote control not working.

Function Key Issues

Troubleshooting steps for when the TV's physical buttons are not functioning correctly.

TV Won't Power On

Diagnostic flowchart for issues where the TV fails to turn on, checking LED indicators and power sources.

Audio Issues

Troubleshooting guide for scenarios where the TV produces no sound, checking connections and speaker components.

TV/VGA/HDMI Input Issues

Steps to diagnose and fix problems with no picture on the screen for TV, VGA, and HDMI inputs.

YPbPr Input Issues

Troubleshooting guide for no picture on the screen when using YPbPr input, checking source and wires.

Video Input Issues

Diagnostic flowchart for no picture on the screen with video input, verifying source and cable connections.

Signals Block Diagram & Power Assign

AC Power-On Sequence

Illustrates the timing sequence for AC power activation and system boot-up with internal POR.

DC Power-On Sequence

Details the timing sequence for DC power activation and system boot-up, including power rail ramp-up.

Main Chip Connections Diagram

Block diagram showing connections between the MT9900 chip and various interfaces like HDMI, USB, and Panel.

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