Sony tv 55W905a

[gkolio]

Hi I’m have tv 55w905a and today blink 4 reds I’m upload the service menu im not technical so can that tv can fix it or go buy new?im from Greek that simple doing 2 years but before put out tv from dc outlet let 3 days with out power and put again and work for 1 year and doing same today try that and not work;( my wife with mistake put backlight 100% and take the 4 reds whene open tv open with full bright picture stay 20 sec have sound and next 4 red leds tnx

[nomoresonys]

Re: Sony tv 55W905a

Maybe try some simple things first before having to take the back off, unplug tv let it sit for 5 minutes, hold the power button in on tv for 30 seconds, plug tv back in and try it. Another thing to try, unplug tv for 5 minutes, hold power and volume + while plugging in tv. hold both til screen comes on then release, if it don't come on after a minute it probably won't work.

[nomoresonys]

Re: Sony tv 55W905a

If no joy then probably time to take the back off, start with cleaning the ribbon cable ends from tcon to panel with isoprophyl alcohol, some use a pencil eraser, not too vigorously they can be fragile, check that all your cable connections are clean and secure/not loose, I'm not exaclty sure what host_wdt is, I think LD_ERR has to do with LD board or maybe bad backlight/s. This tv is about 10 years old right, that's a pretty good run for led backlights, so would not be surprised if some were bad.

[gkolio]

Re: Sony tv 55W905a

@nomoresonys tnx for replay but whene tv open for 30 sec and have and video 1080p from my dvd the screen is lot bright if have problem with leds it’s not little dark?

[gkolio]

Re: Sony tv 55W905a

I'm upload picture before close tv

[nomoresonys]

Re: Sony tv 55W905a

Did you try both the suggestions in post #2?

[nomoresonys]

Re: Sony tv 55W905a

My best guess is the tv is detecting the error after 20 seconds and shutting down, I think it's bad led strips.

[gkolio]

Re: Sony tv 55W905a

Tnxxxxx

[nomoresonys]

Re: Sony tv 55W905a

Maybe one of the knowledgeable members can help you test expected led voltages to be sure, I do see some strips on ali there, I don't know anything about the seller just saw the ad: https://www.aliexpress.us/item/22558...2usa4itemAdapt

[gkolio]

Re: Sony tv 55W905a

Tnx again I’m try to bypass the led check but in psu take 3 pin and put ground correct? Take the cable go to Mainboard or the cable go to led driver?

[nomoresonys]

Re: Sony tv 55W905a

Hard for me to tell without a good clear picture of the powerboard and the little maps/legends, some of the sonys can be tested by grounding the bl_error wire that's correct, usually done by taking the wire out from connector and putting it in one of the empty ground slots on the connector of ld board if available, so if it applies, look at bl_error wire going to ld board take it out with small flat head screwdriver or such on the ld board connector and put in in an empty ground slot on same connector if available. This is for testing and it is not advised to run tv like this, many examples of this test on youtube.

[gkolio]

Re: Sony tv 55W905a

I'm upload my psu pick the uper or the down is the conector put out 3 pin Ty

[Davi.p]

Re: Sony tv 55W905a

Post an LD board photo

[gkolio]

Re: Sony tv 55W905a

Today power on my tv and work 100% think have ghosts hahaha I’m drop backlight to 5 but not know where that tv have prob play 2 days no stop turn on turn off all okz 0 red blinks

[nomoresonys]

Re: Sony tv 55W905a

Ok, well make sure all your connections are clean and not loose and the ribbon cable ends of tcon are clean, can use isoprophyl alcohol or pencil eraser, not too vigorous they are kind of delicate. You may have just had some oxidation, did you unplug and re-plug any cables while testing?

[gkolio]

Re: Sony tv 55W905a

No only put out electric power for 5 days and now play verry good think is problem psu? Btw now play perfect

[Davi.p]

Re: Sony tv 55W905a

No , you are not ok, the problem will return!!!!

[gkolio]

Re: Sony tv 55W905a

Hi the problem gone but what need replace psu leds motherboard led inventer? Bc tv play perfect so not know where is the prob;(

[nomoresonys]

Re: Sony tv 55W905a

Kind of hard to tell, If I had to guess I would suspect one or more of the electrolytic capacitors on the powerboard might be going bad, just a guess, i would update the firmware on it but being from 2013 they probably don't have it on their site still.

[Davi.p]

Re: Sony tv 55W905a

You have 99 or 100% problem at a single or couple of backlight leds, need replace them all unless a tv service assistance makes the work for you..