Hisense 50E77HQ Service Manual Download

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5.3 TV won’t Power On

Notice:

Make Sure Power

source is live

Replace Power Cord

Check/replace IR BD or

Keypad PCA

TV won’t power on

LED

light?

YES

Check

Power

Output

YES

Check

Power

Cord

Only

one works

Replace Main

Try Power on by

RC and Button

Neither

works

Both

Work

Power on

YES

Replace Power BD

YES

RED

No light

Panel Bright

Replace Main BD

YES

Check signal

Source

YES

Replace Panel

(to contact Hisense tech support.)

MT9900 Europe market

：

TV work normally indication led is no light.

TV standby indication led is red.

Summary of Contents for 50E77HQ

Page 1: ...LCDTelevision Service Manual Chassis MT9900 Version V 1 0 Hisense Visual Technology Co Ltd November 19 2021...

Page 2: ...2 REVISION HISTORY Version Revise content Reviser Date V1 00 First issued Wangyue 2021 11 19...

Page 3: ...actory OSD Menu 19 4 Software Upgrading 24 4 1 USB Upgrade 24 4 2 Flash Tool upgrading 26 5 Trouble shooting 29 5 1 Troubleshooting for Remote Control 29 5 2 Troubleshooting for Function Key 30 5 3 TV...

Page 4: ...ve methods of performing service operations Some of these service operations require the use of tools specially designed for the purpose The special tools should be used when and as recommended It is...

Page 5: ...from RCA Hisense assumes no liability express or implied arising out of any unauthorized modification of design Service tech assumes all liability 1 1 2 All ICs and many other semiconductors are susc...

Page 6: ...iginal condition In addition prior to closing set check that Note All wire harnesses and flex cables are properly routed and secured with factory tape and or mounted cable clamps All cables and connec...

Page 7: ...damaged or if the connector is loose do not use the product otherwise this can lead to fire or electric shock 8 If the power connector or the connector of the power cable becomes dirty or dusty wipe i...

Page 8: ...e power supply block it can result in electric shock or may trip the main circuit breaker When installing the LCD module in and removing it from the packing carton be sure to have at least two persons...

Page 9: ...emoved for servicing purposes have all been returned to their proper locations in accordance with the original setup The lightning flash with arrowhead symbol within an equilateral triangle is intende...

Page 10: ...10 2 TV boards 2 1 Main board layout 2 1 1 The top of main board 2RSAG7 820 11711 The rear of main board 2RSAG7 820 11711...

Page 11: ...11...

Page 12: ...rminal Power board terminal Pin definition Pin definition 1 GND 1 GND 2 BL_EN SW 2 BL_EN SW1 3 DIMMING2 PWM2 3 DIMMING2 DIM1 4 DIMMING PWM 4 DIMMING PWM1 5 VCC_A 5 VCC_A VCCA1 6 GND 6 GND 7 VCC_A 7 VC...

Page 13: ...ltage 44 12V Panel 9 NC No Connection 43 12V Panel L65 NC 10 GND Ground 42 GND R223 0 11 GND Ground 41 GND R217 0 12 GND Ground 40 GND R222 0 13 GND Ground 39 GND R216 0 14 GND Ground 38 GND R221 0 15...

Page 14: ...ne 3 15 C_VB1_4N 38 RX3P VX1 lane 3 14 C_VB1_4P 39 GND Ground 13 GND 40 RX4N VX1 lane 4 12 C_VB1_5N 41 RX4P VX1 lane 4 11 C_VB1_5P 42 GND Ground 10 GND 43 RX5N VX1 lane 5 9 C_VB1_6N 44 RX5P VX1 lane 5...

Page 15: ...5 18 C_VB1_16P 25 GND Ground 17 GND R634OK 26 GND Groun 16 GND R636OK 27 NC No Connection 15 Ground R637 NC 28 NC No Connection 14 GND R635 NC 29 NC No Connection 13 NC 30 NC No Connection 12 12V pane...

Page 16: ...55U69GEVS 2 2 TV boards part list Main board Boards function difference Main chassis type For Series 2RSAG7 820 11711 R OH 1 Lateral terminal and vertical terminal 2 Different AMP design 3 Adapt diff...

Page 17: ...17 3 Factory Service OSD Menu and Adjustment 3 1 Remote Control...

Page 18: ...18...

Page 19: ...19 3 2 Factory OSD Menu figure 1 Factory OSD menu list if you want to learn more about TV you d better read it but would not adjust the value please The Factory menu may be have difference for diverse...

Page 20: ...tomer Take 55U69GEVS for example Options Write keys Note Check whether the Key information under the current Version is OK if appears NG or such as following red surround irregular information then ne...

Page 21: ...l init TV Produce signal preset during the factory produce using Option Items can choose Clear all initial the TV EEPROM reset Soft version current software version information Version Software Versio...

Page 22: ...22 Channel init huangdao old Qing Dao TV Produce signal preset during the factory produce using huangdao new...

Page 23: ...can write HDCP2 2 If HDCP key code lost you can write Netflix If Netflix key code lost you can write Widevine If Widevine key code lost you can write Note The Factory menu may be have difference for d...

Page 24: ...TV is trying to load the software and it will spend about 2 minutes After that Usb Upgrade Checking will be displayed and upgrade process bar will indicate the progress It needs about 5 minutes to com...

Page 25: ...25 Firgure 1 Upgrading software Firgure 1...

Page 26: ...rers need to burn the boot program Then USB disk to upgrade the mt5895_m1v1_em_secure_emmcboot bin file 4 2 1 TV needs to be linked serial port And you should stop the serial port toor on the PC like...

Page 27: ...27 Click choose bootloader image and the click upgrade Then wait the upgrade finished...

Page 28: ...a 0xff 0x64 set cu When the program finished we need to change projectID Execute the following orders in DTV 1 cd hispid 2 list show all the models 3 update 2 deploy change projectID to 55U69GEVS Some...

Page 29: ...ote Control Remote control does not work Try new batteries Replace RC Check IR receiver Change Led IR board Change Led IR cable Replace main board Replace battery Replace remote control Replace Led IR...

Page 30: ...or Function Key Buttons does not work Check switches Check key board Check Key BD cable Change Key BD cable Replace main board Check solder connections and see if any switches are stuck Replace Key BD...

Page 31: ...NO Check Power Cord Only one works Replace Main BD Try Power on by RC and Button Neither works Both Work Power on OK YES NO Replace Power BD YES NO RED No light Panel Bright NO Replace Main BD NO YES...

Page 32: ...4 Troubleshooting for Audio No sound Check connecter Check speaker wire Replace main board Reconnect Replace speaker wire YES YES NO NO Check speaker set Replace speaker set YES NO OK YES Power Supply...

Page 33: ...Troubleshooting for TV VGA HDMI input No picture on the screen Check Signal Source Check connect Check cable Replace main board Make sure signal source is available Reconnect Replace cable NO YES YES...

Page 34: ...Troubleshooting for YPbPr input No picture on the screen Check Source work or not Check connect Check Wires Green Blue Red Replace main board Check Source Device Reconnect Replace wires NO YES YES NO...

Page 35: ...7 Troubleshooting for Video input No picture on the screen Check Source work or not Check connect Check Cable Wires Replace main board Check Signal Source Reconnect Replace Cable Wires NO YES YES NO Y...

Page 36: ...36 6 Signals Block Diagram power assign schematic diagram...

Page 37: ...37...

Page 38: ...38...

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