Sony Bravia KDL-40R480B - LED Error Indicator Blinks 6 Times, Screen Goes Blank

Hello,
I have a Sony Bravia KDL-40R480B TV. The symptom is that when turned on, the SONY logo appears and it reboots three times. Then the screen goes blank and there are 6 red blinks. Every time the TV is turned on, it will have time to enter the normal mode (displays the message no signals), but after a few seconds, restart to the SONY logo and signal the error 6x by blinking the red diode.

Apparently, at the beginning the problem occurred after 2-3 hours and after some time we have the condition as described above.

According to posts on the forum and the diagnostic manual found here, the problem in highlighting. The TV has 10 stripes with 5 LEDs on each. I undressed the TV and checked all the LEDs one by one with a meter (they all glow) and then I connected each strip to the 15V power supply and it also turns out that they all glow normally.

For a Chinese, new strips for this model are priced PLN 100 per set, but should you risk replacing them if the original ones do not reveal damage to the diodes? Is the problem then on the side of the power circuits?

In the attachment there is a photo of the LED power supply (the backlight connector is the first from the left and top) and the strips themselves (Chinese, they look identical).

Regards
morghul

Check that each strip has the same voltage, preferably with an LED tester.

Hi!
If the power consumption of the LED lines is the same, then I would consider the LEDs as good. The 0 ohms of the connectors must be checked.

colore

And my colleague checked the connections of the slats, there are also breaks there, it is best to connect all of them, even for the future.

Wiesław.K. wrote:

And my colleague checked the connections of the slats, there are also breaks there, it is best to connect all of them, even for the future.

I did not check, you mean the sockets where the strip is connected to the main, vertical power rail?

Colleagues think that you check the transient resistance on all led connectors.
One or more LEDs are certainly not good.
This IC should be an LED driver.

Oops, the topic is old.

check the voltage in the + 5v power supply

badael wrote:

Colleagues think that you check the transient resistance on all led connectors.
One or more LEDs are certainly not good.
This IC should be an LED driver.

Oops, the topic is old.

Maybe old but still not resolved :)

roki1460 wrote:

check the voltage in the + 5v power supply

I'll take a look by the way. Now I have it folded up, but I plan to open it again for Christmas and try to run it. If not, it's a pity but it will be thrown away.

Sorry, clients do not like to wait so long .
I think you can solve the problem, but you have to remove the display.
Turn on the TV without display, and you'll see which LED channel is not rolling ... it has 5 channels.

My friend, I had a similar problem with Sony, but another model, the problem was the break on one LED from the backlight. I checked with the meter and it was ok when I connected it to the power supply it was ok, but when I started to gently bend the led strip, it started to flicker. Replacing the diode helped, try to connect the strip to the regulated power supply and slowly lower the voltage, all of them should fade evenly, if one of them starts flickering on the background of the others, it is either damaged or will be damaged in a moment.

OMMMM wrote:

My friend, I had a similar problem with Sony, but another model, the problem was the break on one LED from the backlight. I checked with the meter and it was ok when I connected it to the power supply it was ok, but when I started to gently bend the led strip, it started to flicker. Replacing the diode helped, try to connect the strip to the regulated power supply and slowly lower the voltage, all of them should dim evenly, if one of them starts flickering against the background of the others, it is either damaged or will be damaged in a moment.

Here's an interesting lead. I will check it also then.

I have the same TV and the same symptom.

I undressed and one diode was burnt, I replaced the entire strip with a new one (5 diode).
After replacement, it has no effect. So I don't know if it's a matter of LEDs or maybe firmware

microkod wrote:

I have the same TV and the same symptom.

I undressed and one diode was burnt, I replaced the entire strip with a new one (5 diode).
After replacement, it has no effect. So I don't know if it's a matter of LEDs or maybe firmware

I haven't looked at it recently, a bit of a lack of time, but as I wrote above, it looks strange because sometimes it starts working for a few seconds after turning it on and then the image disappears and an error blinks out.
What do you mean when you write about the software?

possibly the software update has been interrupted or something along those lines

microkod wrote:

possibly the software update has been interrupted or something along those lines

But I understand you think this is the effect of the failure, not the cause. Because for me the problem was clearly getting worse, i.e. the TV worked shorter and shorter until it finally fell down completely and only sometimes it turns on for a few seconds.

And where did a friend buy a replacement LED strip?

I bought these in Mawipol Oświęcim

morghul wrote:

you see, an interesting lead. I will check it also then.

Poor chances, guy

morghul wrote:

And where did a friend buy a replacement LED strip?

STRIP SAMSUNG 2013SONY40A 3228 05 REV1.0 130927 A - also -mawipol-with Allegro, oddly enough it shines brighter than the factory ones.

Today I sat over these LEDs again and changed the lists in places, the TV set started working strangely. I've already been testing it for 5 hours and everything is fine.
Maybe someone explain why.

microkod wrote:

morghul wrote:

And where did a friend buy a replacement LED strip?

STRIP SAMSUNG 2013SONY40A 3228 05 REV1.0 130927 A - also -mawipol-with Allegro, oddly enough it shines brighter than the factory ones.

Today I sat over these LEDs again and changed the lists in places, the TV set started working strangely. I've already been testing it for 5 hours and everything is fine.
Maybe someone explain why.

Someone wrote above that contact problems do happen. Still working for you?
I did not detach the strips as I checked if the diodes were lit, maybe the contacts of the strips do not work?

It`s been working for a week now and everything is fine.

microkod wrote:

It's been working for a week and everything is fine

Oh shit ... well, my friend encouraged me to open it again . I will look at the weekend and check the socket outlets, they all seem to glow for me when I checked, so maybe it is actually a socket.

morghul wrote:

microkod wrote:

It's been working for a week and everything is fine

Oh shit ... well, my friend encouraged me to open it again . I will look at the weekend and check the socket outlets, they all seem to glow for me when I checked, so maybe it is actually a socket.

And I take it apart and put it together ... check the diodes, measure the voltage, solder the jumpers ... and here, like Fr. Dolasa changed cards quickly and has been smoking for three months now ... mucias gracias amigo

lekkhai wrote:

morghul wrote:

microkod wrote:

It's been working for a week and everything is fine

Oh shit ... well, my friend encouraged me to open it again . I will look at the weekend and check the socket outlets, they all seem to glow for me when I checked, so maybe it is actually a socket.

And I take it apart and put it together ... check the diodes, measure the voltage, solder the jumpers ... and here, like Fr. Dolasa changed cards quickly and has been smoking for three months now ... mucias gracias amigo

ps ... after replacing the straps with new ones from Ali Chinaman, he did not fire me ... I just made jumpers on the strips and there was contact ...