Sony Bravia Kdl40Hx850 Smart Led Tv Troubleshooting Repair Guide

Difficulty

Moderate

Steps

Time Required

                          1 hour

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Sony bravia kdl40hx850 smart LED tv troubleshooting
7 steps

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Introduction

Due to data loss on my computer i lost all the pictures to make this guide.. if you have questions , feel free to contact me.

What you need

Step 1

              Sony bravia kdl40hx850 smart LED tv troubleshooting

before we take the tv apart we will do a self diagnostic test on the tv. See for more info in the service manual that i add to this guide.
for a self test on the tv , push following buttons on the remote: display button ( see picture for more info on this button ) channel 5 volume down and than power button.
due to data loss on my pc i lost all the pictures to make this guide.. if you have question , feel free to contact me.

before we take the tv apart we will do a self diagnostic test on the tv. See for more info in the service manual that i add to this guide.

for a self test on the tv , push following buttons on the remote: display button ( see picture for more info on this button ) channel 5 volume down and than power button.

due to data loss on my pc i lost all the pictures to make this guide.. if you have question , feel free to contact me.

1024

Step 2

we will open the tv. first we will remove the BUNCHIN audio undercarriage. So you can move the tv separately
remove the 3 screws holding the panel tot the undercarriage.
remove the other 3 screws as shown in picture 2
lift the panel ( tv) up and remove it from the BUNCHIN audio part ( sole, undercarraige…)
to remove the screen : do this with 2 persons and lay the tv down on a sheet ( blanket)or something.
when removing the screen from the audio undercarrige: whatch out for the audio cable ( remove this before removing screen)
like you know always make sure the tv is unplugged from the electric socket before you manipulate the tv.

we will open the tv. first we will remove the BUNCHIN audio undercarriage. So you can move the tv separately

remove the 3 screws holding the panel tot the undercarriage.

remove the other 3 screws as shown in picture 2

lift the panel ( tv) up and remove it from the BUNCHIN audio part ( sole, undercarraige…)

to remove the screen : do this with 2 persons and lay the tv down on a sheet ( blanket)or something.

when removing the screen from the audio undercarrige: whatch out for the audio cable ( remove this before removing screen)

like you know always make sure the tv is unplugged from the electric socket before you manipulate the tv.

Step 3

we will remove the power supply plate.
it is a small black plastic plate holding the power cable.
remove 1 screw and slide the plastic cable holder to the left away from the plate.

we will remove the power supply plate.

it is a small black plastic plate holding the power cable.

remove 1 screw and slide the plastic cable holder to the left away from the plate.

Step 4

we will remove the back plate. you have to remove 22 screws.
first remove the 2 screws in red. start with the screw on the left.
remove the 4 screws in yellow. start with the one on the left
remove the 14 screws in green. the 2 on the side as last.

we will remove the back plate. you have to remove 22 screws.

first remove the 2 screws in red. start with the screw on the left.

remove the 4 screws in yellow. start with the one on the left

remove the 14 screws in green. the 2 on the side as last.

Step 5

remove the last screws , in blue.
now remove the panel
to remove the panel : lift the back plate towards you ( beginning with the upper side of the plate) , then tilt it to the left.
right is the allignment corner.

remove the last screws , in blue.

now remove the panel

to remove the panel : lift the back plate towards you ( beginning with the upper side of the plate) , then tilt it to the left.

right is the allignment corner.

Step 6

              checking out LVDS/LCD cable to improve screen

now you’ll see all the PCB’s.
now it’s time to check out the LVDS cable or LCD cable and the LVDS connector. wiggle getnly the cable and check te tv.
in red de LVDS connector. attached on that connector the LVDS/LCD cable.
if the screen or picture is not better you can check out the diodes on the T con board. or follow the trouble shoot page in the service manual.

now you’ll see all the PCB’s.

now it’s time to check out the LVDS cable or LCD cable and the LVDS connector. wiggle getnly the cable and check te tv.

in red de LVDS connector. attached on that connector the LVDS/LCD cable.

if the screen or picture is not better you can check out the diodes on the T con board. or follow the trouble shoot page in the service manual.

Step 7

              removing T Con Board

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Author

                                      with 2 other contributors

                    Kevin D

Member since: 05/02/2014

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William Whitaker - Nov 11, 2017

I have a CM LEDVD combo TV and DVD that will not turn on. It has power 120VAC and did work after using the DVD. Any ideas??

jennifer holevatz - Dec 1, 2018

i have a 75inch tv just stoped playing sound

my bedroom tv is working great

the bell tube dings are audible

please help me

Gilian - Dec 1, 2019

Hi!Did you ever fix the problem @kevind ? My grandma has the same TV and similar sympthoms.

dap2996 - Feb 21, 2021

my tv went all blue no pic or audio. audio is in the surround sound cant get any pic had water leak and i think some go into t he back ?? but just had dpops on it Ands we watched a movie later that night and than it kicked to blue screen any thoughts

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