LG 55LB650V - Flashing TV Screen Issue, Capacitors Intact, Blinking 2x/sec - Help Needed

Question

Hello. My tv blinks right after turning it on. About 2x a second. The electrolytic capacitors are all whole, or at least you can not see the defect. Please help.

elcomandante · Answer

looks like a power supply problem - short circuit / overload on the output, or the power supply itself. These can be capacitors (most likely at the output of the power supply). Do you have a diagram?

buli1 · Answer

It's flashing, but what ?? Image? backlight? all the time flashing? is something else going on too little info ...

seralion · Answer

I do not have a scheme. The backlight flashes all the time round. Nothing else happens. The image itself reacts as needed. All options work. I do not know what else I could say.

buli1 · Answer

I bet on a damaged LED backlight.

tomek5333 · Answer

a typical symptom of backlighting, the more often in LG the ledes, rozemy matryce and check or immediately saw which diodes do not shine. With hot aire you can change the diodes themselves without having to leave any stripes

niewolno2 · Answer

As for the visual check of the capacitors, this is far too little and you would have to check them with a meter.

elcomandante · Answer

with such symptoms I would rather put on a power supply for the led-y, and it is the capacitors that are first to be replaced.

ganitu · Answer

Hello, I have the same model LG and the same fault, as the repair of the above-mentioned TV ended - I put on diodes in the backlight.

tomek5333 · Answer

remove the dies and replace the diodes as you do not have a hotair, then replace the strips

buli1 · Answer

Buddy, you're writing nonsense .....

Freddy · Answer

Please, justify it.

ganitu · Answer

In my TV there were 2 LEDs 6V 2W defective in the backlight, after the TV exchange works properly, the demolition of the matrix at such a diagonal is an extreme sport, you can sweat a little. greetings

buli1 · Answer

Buddy with all due respect, but it does not make sense to justify it. Who even had to deal with tv lg .... knows where to start, probably you know what is damaged.

shrederr · Answer

Damaged LEDs, standard. Greetings.

kusalek · Answer

Hello
I confirm: in this case the diodes also turned out (the upper set - 3 rows, powered from a higher voltage, the left converter at the very top, looking at the power supply board from the side of the 230V socket, where there are two 33uF / 350V capacitors connected in parallel) .
Question to Tomek5333: what idea to remove strips from sheet metal - the adhesive holds very tightly.
Maybe other colleagues would have something to say to my last question.
Thank you for any ideas.
Regards

kusalek · Answer

And it happened.
All lighting replaced. Original LG. 10 slats, double-sided tapes included. TV dedicated. The next day, the information that the image again lights up and disappears.
I took again to the workshop. After switching on, it flashes. I stripped to "naked". I turned on and ..... lights up. It is true that in the first move on the slats there is a voltage of 178 and 118 V, but after a while it stabilizes on the values of 157 and 104 V. And it shines on itself.
Anyone have any idea what might be causing the flashing? (after repair).
I checked the electrolytic capacitors for capacity, although in the system, but the capacities were tolerant.

[Solved] LG 55LB650V - Flashing TV Screen Issue, Capacitors Intact, Blinking 2x/sec - Help Needed

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