Sony SONY KDL-55EX501 6 Blinks, Loud Buzz, Reset

[mack505]

Sony KDL-55EX501 showing 6 blinks. I replaced the inverter board, when I powered on, I got the sony logo, chime, then a loud buzz, reset, and it repeats twice, then shuts off, gives 6 blinks again.

The buzz sound appears to be coming from the largest grey component on the D1 board in the pic. Any ideas? (sorry if the pic sucks)

[freakaftr8]

Re: Sony SONY KDL-55EX501 6 Blinks, Loud Buzz, Reset

That's the inverter transformer. You may have a bad CCFL bulb behind your panel. These transformers get loud when you have s bad bulb or a shorted bulb. Check the soldering underneath that transformer. .

[budm]

Re: Sony SONY KDL-55EX501 6 Blinks, Loud Buzz, Reset

Also make sure the HV connectors are properly seated.

[mack505]

Re: Sony SONY KDL-55EX501 6 Blinks, Loud Buzz, Reset

I re-sat all connectors. Still same. All the soldering under D1 looks ok. Is there a way to determine for sure if one of the bulbs are bad? That would be game over I guess...

[mack505]

Re: Sony SONY KDL-55EX501 6 Blinks, Loud Buzz, Reset

I opened it up a bit further and all the ccfl bulbs do illuminate when it does its three attempts to start, so those should be ok. Any suggestions where to go from here?

[freakaftr8]

Re: Sony SONY KDL-55EX501 6 Blinks, Loud Buzz, Reset

Are there any burned ends on any of the bulbs? Imbalance of the CCFL's can be an issue. Obviously the transformer is doing its job or they won't light so may not be the issue unless it's arcing internally

[mack505]

Re: Sony SONY KDL-55EX501 6 Blinks, Loud Buzz, Reset

I only checked from one end, but they looked ok. Could the D1 components, or board itself be bad?

[budm]

Re: Sony SONY KDL-55EX501 6 Blinks, Loud Buzz, Reset

Smell any Ozone? or see any arcing in the dark room?

[mack505]

Re: Sony SONY KDL-55EX501 6 Blinks, Loud Buzz, Reset

Turned it on in a dark room, didn't see any arcing. Not sure what ozone smells like exactly, but I didn't smell anything out of the ordinary...

[mack505]

Re: Sony SONY KDL-55EX501 6 Blinks, Loud Buzz, Reset

Replacing D1 board resolved this for me.

[dkneyle]

Re: Sony SONY KDL-55EX501 6 Blinks, Loud Buzz, Reset

Tell us what the D1 board is? Gives us a hint as to what the failure was.