Question about Sony BRAVIA KDL-40V2500 40 in. LCD HDTV
I am new to the TV repair field and would like to ask a question. My customer has a Sony Bravia 40 inch KDL40V2500. The TV turns on with a green light, then immediately turns off, blinks in red 4 times. It continues to blink in red, until you power off the unit. Is it the power board or the T Con Board? There is no video no sound no signs of POPPED capacitors.
Hi... If it is a power board problem it is most likely capacitors that fail. Look for any electrolytic capacitors that are bulging on top. They are normally round with an aluminium top with a cross marked in the metal. They fail over time if they are low quality or high ESR with high transient voltages.
Make sure that you replace them with same or higher voltage ratings but with the same capacitance.
If you do buy them for stock in your repair shop look for high quality low ESR variety that will not a cause comebacks.
Hope this helps!
Posted on Feb 16, 2015
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Posted on Jan 02, 2017
SOURCE: Sony KDF-E50A10 No Picture
4 times blink error shows that any FAN is not running in TV as there are 4 fans in this TV.
Please check fan connectors and make sure all are plugged securely.
Posted on Feb 14, 2009
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
SOURCE: my sony bravia 46" doesnt
you have to replace the inverter board. If the invereter board overloaded the powers supply, then the tv will go to standby after some time.
Posted on Jun 21, 2011
It's not to complicated, in the newer TVs as well as other things, when you first turn them on the diagnostic circuits kick in [that the first relay you hear click] it sends a signal (low voltage) to all the circuits to check them and make sure there are no problems. If it gets the proper returns from each circuit it kicks out and the full power relay kicks in and powers your set up. This is done to protect others circuits that might be effected by a flaw in a different circuit. What started as a small flaw in a component has gotten worse with use which is normal. Your set is kicking the diagnostic circuits and they are detecting the problem and shutting it down. You have problems with your power board, if the diagnostics circuits were not in place and full power hit the set the power board could possibly put triple or more voltage to some section of another board, thus burning it out also. That's why they started using the diagnostic circuits on TVs, Computers have had them for years. Late model car - etc. I would take the power board out of it and go to shop Jimmy's and enter the part # which will be on the board and order me another one and pop it in and kick back and watch TV again. I don't know what a power board would cost for it but "shopjimmy's" carries high quality boards at a reasonable price. I do caution you on buying a refurbished board, they are tempting but I have never and I mean never seen one hold up very long. As a matter of fact I will not put one into a TV or anything else for that matter. So there is light at the end of the tunnel and it's not the train this time! I only work on the kind of TV that plug into the wall or run on batteries, therefore, I've seen a bunch of them in14 years. Don't worry about getting the wires mixed up because one thing about TVs is a harness or plug will only fit one place and that is where it belogs you can't cross them up.
Posted on Oct 23, 2012
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