Sony bravia kdl40hx850 smart LED tv troubleshooting

Sony bravia kdl40hx850 smart LED tv troubleshooting

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Document DEVICE REPORTSony bravia kdl40hx850 smart LED tv troubleshooting
Sony bravia kdl40hx850 smart LED tv troubleshooting
Sony bravia kdl40hx850 smart LED tv troubleshooting
we will check the bad screen ( flickering and ghosting screen). this tv had multiple problems so we will focus on the teardown. i add the service manual this is very helpful for troubleshooting and dissasembly
Written By: Kevin D
INTRODUCTION
this tv had a bad screen ( ghosting and flickering). This tv is well know for this problem. most of the time there are 3 major causes : bad T CON board, loose flat cables or a bad LCD screen) also a bad lvds connector can cause some problems so also check the connector real good as well the cable. 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.

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Sony bravia kdl40hx850 smart LED tv troubleshooting
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.

© iFixit -- CC BY-NC-SA

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Page 2 of 6

Sony bravia kdl40hx850 smart LED tv troubleshooting
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.

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Sony bravia kdl40hx850 smart LED tv troubleshooting
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.
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.

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Sony bravia kdl40hx850 smart LED tv troubleshooting
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.
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.

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Page 5 of 6

Sony bravia kdl40hx850 smart LED tv troubleshooting
Step 7 -- removing T Con Board
 Insert wisdom here.
This document was last generated on 2017-06-22 03:27:43 PM.

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