Question about Sony KDL40EX400 40 in. HD-Ready TV
At some point you have to cut your losses, this is the reason I suggest getting an extended warranty with coverage (including the maker) of 3 years, 80 of the 140 sets in our shop are less than 3 years old, if this set had that they would have to fix or replace the set----One reason I choose to answer your question (I do this here for free) is this set ought to have a error buffer, when set fails it will count the event and that also indicates where the issue is.
Most of the Sony sets for the last decade with set off and using the Sony remote: Display, 5, vol down, and POWER will if set comes on bring up a display with a number of shortened items listed----they should all if the set has this be a zero. Any with a number indicates a issue and the number indicates the number of times this event has happened.
Posted on Dec 04, 2012
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Posted on Jan 02, 2017
A 4 flash issue means either the back light inverter (power supply) has failed or that one of the fluorescent tubes in the panel has failed. The only way to know for sure is to check the fuses that are on the inverter board. If one or more of the fuses are opne, then it is likely the inverter board is bad. If the fuses all check good, then the panel is at fault. If it is the inverter board, it is a part you could replace yourself; the cost of the board is about $70. If it is the panel, you would probably want to consider replacing the TV, as the repair costs would be over $1000
Posted on Dec 10, 2008
SOURCE: Sony Bravia TV went Blank
COULD BE LVDS CABLE LOSE OR NOT MAKING A GOOD CONTACT , IF IS NOT THAT UNFORTUNATELY IT WILL BE NECESSARILY TO REPLACE T CON BOARD
YOUR RATING TO MY ANSWER ITS HIGHLY APPRECIATE
Posted on Jun 29, 2008
Try leaving the TV unpugged for 30 minutes so the TV can reset itself.
If that doesn't work, most likely the TV has a power supply related problem. The most common thing to go out is the circuit board that supply power to the screen. Commonly called a Backlight Inverter Board.
I can't say it's 100% the problem because I can't actually look at the tv over the internet.
If by chance the TV is still under warranty, go that route.
If not under warranty and If you have some electronic experience, you can purchase a Service Manual over the internet and diagnose the source of the problem and fix it by soldering in the new part. The Service Manual will give you flashing red light codes, circuit diagrams, test points, and part# lists. Usually, cost under $20.
I hope I shed some light on the subject for you.
Posted on Jun 29, 2009
re: sony flat panel lcd tv mod. # klv s 40a10.
No power. When power button is pressed, nothing happens.
The stand-by at the power supply ( cn6201) measures to be 3.47 v. instead of 5 v. However, when I unplug cn6201 (5 pin connector) I can read 5v. at the power supply.
Posted on Aug 29, 2009
Sorry not a solution...We also have exact same problem (TV about 1.5 years old) - out of warranty - all Sony told me to try was to un-plug TV for 2 minutes - useless.
I am trying to decide if I should bring to service store to try to fix.
I hate to spend a couple of hundred dollars to find out it costs $2000 - less then a new one.
Anyone have any suggestions?
Posted on Oct 23, 2009
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