Sony kdl-40w590: 5-blink code

[budm]

I have this one from E-recycle sitting around for about month so I decide to take a look at it today.
It has 5-blink code for T-CON error, so first thing I check is the 2A fuse on the integrated T-CON board, sure enough the fuse is blown.
I check the resistance on the output side of the fuse, it shows <1 Ohm so I start checking the cap and the protection diode right next to the fuse. I remove the diode but the shorts is still there, so I remove the cap right next to the Diode then the shorts went away, the resistance against GND is now showing around 10K Ohms. I am very lucky that the first cap I removed is the bad one otherwise there will a lot of probing and may involve using power supply or using super low Ohm meter for tracing for the shorted parts.
I also check the backights setting, it looks like the old owner already had it set to 6 for all inputs.

[Andrew F. Ali]

Re: Sony kdl-40w590: 5-blink code

Good job!!....You were able to quickly solve this issue because of your super strong troubleshooting skills and vast background knowledge....Good to see the Master at work...

[budm]

Re: Sony kdl-40w590: 5-blink code

Well, 1 month later the TV went out right in front of my eyes while watching it, the image just slowly wiped out by black cloud, the backlights is still on. There is no error code this time.
Took it at apart, the fuse and the 12VDC is still present, then I use my Ohm meter to start checking for bad MLC caps again, I get to the AVDD testpoint and it shows 29 Ohms in both directions, there are 4 caps, C03 ~ 06 connected to the AVDD output. I remove the C03 first but AVDD still shows 29 Ohms, then remove C04 then the AVDD show 6K Ohms so I got lucky again. I check the capacitance of C03 it shows about 10uf. I remove all 4 caps and replaced them with 10uf 35V, TV is up and running again. I sure hate to see other MLCC fail later but not much I can do since no way I will replace them all. Ohms meter is your friend.
I also look some application notes, most of them use two 22uF 35V caps in parallel for the AVDD.
It only take 1/2 hours this time to fix this darn TV. I am sure a lot of this model with this panel have the same problem.
I.E. https://www.badcaps.net/forum/showth...t=68594&page=2
Picture provided by triplefour.