LE37B530 Backlight Blinking

[alepol]

Hi,
I m french so excuse me for my english.

Power board BN44-00301

My tv started 1 time /10, i fuse solder in power board and now it start all time but the backlight blinking.

I check the inverter with a CFL ligh is lighting for 5 secondes and stop.
I connected the CFL light and the backligh, all blinking 2-3 s and stop.
Only backligh, all the CFL on the panel blinking, i checked all the connections are
If you have any idea, solution ?

Thanks a lot and STAY AT HOME.

Regards

[nomoresonys]

Re: LE37B530 Backlight Blinking

See if you can turn the backlight NOT brightness way down in the picture settings, then see if there's any change in symptoms.

[alepol]

Re: LE37B530 Backlight Blinking

Hi,
Thnaks for you reply, When i change the backlight setting, is ok for 5-10 secondes end backlight Off.

Regards

[nomoresonys]

Re: LE37B530 Backlight Blinking

Ok, thinking probably bad/weak led/s in backlights if it stayed on longer.

[CapLeaker]

Re: LE37B530 Backlight Blinking

that unit has ccfls as back light. Check the secondary on each transformer on the inverter board and compare them to each other. Look for cracked solder joints, evidence of one transformer running hotter than the other, resolder the blue capacitors.

[alepol]

Re: LE37B530 Backlight Blinking

Hi, all thanks for you reply, there is only 2 inverter transfo, white and black i don't know what is mean, i already resolde all on this 2 transfo, i solder all the cfl to the clips to be sure, so i mean is not a bad contact, do you know is a old CFL can use more courant and pass the PFC down ?

Regards

[alepol]

Re: LE37B530 Backlight Blinking

I already resolder the capacitor and check with other.

[ngth82]

Re: LE37B530 Backlight Blinking

Can you post some clear pictures of the boards on your TV and the inverter board?

What's the complete model number of your TV? LE37B530****** **** ?

I've seen a few with transformers that has a "sense" winding on the same as the primary side. When the induced voltage is higher than a threshold, it'll shut the CCFL's down. For testing, you can pull the sense circuit to GND and see if that works longer -- that'll indicate a problem with the CCFL's themselves.

There's a video that 12voltvids on YouTube did for this a couple of years ago: https://www.youtube.com/watch?v=Dh01ZepjDp0

[nomoresonys]

Re: LE37B530 Backlight Blinking

that unit has ccfls as back light. Check the secondary on each transformer on the inverter board and compare them to each other. Look for cracked solder joints, evidence of one transformer running hotter than the other, resolder the blue capacitors.

Oops my bad, forgot to check what backlighting was used.

[diif]

Re: LE37B530 Backlight Blinking

Oops my bad, forgot to check what backlighting was used.

It's a B series and the OP mentions CFL three times in his post.

[nomoresonys]

Re: LE37B530 Backlight Blinking

It's a B series and the OP mentions CFL three times in his post.

STUFF it dif boy.

[alepol]

Re: LE37B530 Backlight Blinking

Hi, i posted a picture off power supply and the exact model

[budm]

Re: LE37B530 Backlight Blinking

Can we see the whole backside of the TV showing all the boards?

[alepol]

Re: LE37B530 Backlight Blinking

Hello,

[budm]

Re: LE37B530 Backlight Blinking

Where are those two set of high Voltage wires (Pink and Black, Brown and Black) with connector go to, they are on the right side of your picture?
Any one work on this TV before you?
What happen to the two High Voltage connectors (CNI801/802) in the inverter section?

[alepol]

Re: LE37B530 Backlight Blinking

Hello,
Yes of course i solded directy brown and black cable to the main bord and connector to the black and ping cable to the backlight, so i m sure the connection is good.