Panasonic TX-L55ET5B wont turn on, flashing red light

[Bloopeta]

I have a Panasonic TX-L55ET5B that wont turn on.

When you press the power switch on set, you get the blinking green light, then it goes solid, the display comes on and goes off 3 times, then it goes off completely and the power light slowly flashes red continuously.

If I hold power button and turn it off, and back on, it does the same as above.

When the display is on, there is a noticeable noise from inverter board, that is only audible when screen is illuminated, it goes off and back on with the screen.

I have attached pics of rear and boards.

Any help grately appreciated.

[neilc6]

Re: Panasonic TX-L55ET5B wont turn on, flashing red light

Google for a service manual. Panasonics typically will blink an error code.

[Bloopeta]

Re: Panasonic TX-L55ET5B wont turn on, flashing red light

Google for a service manual. Panasonics typically will blink an error code.

I already have done, but mine just blinks continuously forever, the error code blinks only go up to 25

[Bloopeta]

Re: Panasonic TX-L55ET5B wont turn on, flashing red light

The noise when display comes on is coming from one of these in attached picture, think the far right one.

Its quite a high pitched noise and quite loud

[zomi]

Re: Panasonic TX-L55ET5B wont turn on, flashing red light

Edge lit tv
But backlights do go on these as well.

[Bloopeta]

Re: Panasonic TX-L55ET5B wont turn on, flashing red light

Edge lit tv
But backlights do go on these as well.

Is that likely to be the problem?

[zomi]

Re: Panasonic TX-L55ET5B wont turn on, flashing red light

I would check the leds using a led tester
from the connectors first without having to take it apart first.

also check voltages at the led inverter there

[Bloopeta]

Re: Panasonic TX-L55ET5B wont turn on, flashing red light

I would check the leds using a led tester
from the connectors first without having to take it apart first.

also check voltages at the led inverter there

Will do thanks, do you by chance know what the readings should be??

[zomi]

Re: Panasonic TX-L55ET5B wont turn on, flashing red light

service manual is here

https://www.manualslib.com/manual/10...page=17#manual

its seems for 3 blinks

A -board
P -board

[Nick's Tvs]

Re: Panasonic TX-L55ET5B wont turn on, flashing red light

We have seen a few of these come in to the shop, main board generally get's the good old cracked joints on the BGA chip for this model.
remove the heatsink on the main board, heat up the BGA chip with hot air, see if that temporarily fixes your issue.
Often when the main boards go bad, they won't self diagnose properly and then won't throw the correct error codes, or won't throw an error code at all.