40" Sony LCD KDL-40EX500 Seconds to black (6 blinks)

[tom66]

Re: 40" Sony LCD KDL-40EX500 Seconds to black (6 blinks)

Yeah, that could trip an over-voltage protection (OVP) feature on an inverter. Many inverter controller chips have OVP. Usually it's set to >26V, sometimes >27V.

[tieny]

Re: 40" Sony LCD KDL-40EX500 Seconds to black (6 blinks)

Does 26V on the 24V rail to the inverters seem high?

[tom66]

Re: 40" Sony LCD KDL-40EX500 Seconds to black (6 blinks)

So I'd suspect one of the bulbs in the panel as being bad...

[tieny]

Re: 40" Sony LCD KDL-40EX500 Seconds to black (6 blinks)

Theres a BL_ERR on the PSU.

Yep theres a BL_ERR. It measures 3.3V on standby and once the backlights turn on it drops to 0.04V then back up to 3.3V when off, and cycles

[tom66]

Re: 40" Sony LCD KDL-40EX500 Seconds to black (6 blinks)

Is there a pin marked INV ERR?

[tieny]

Re: 40" Sony LCD KDL-40EX500 Seconds to black (6 blinks)

Well I just got the new inverter board and no luck... Same problem.

I said that I did notice that as soon as I plug in the TV, it immediately begins to blink 6 times before it is even turned on.

Wouldn't this mean the PSU is at fault? Since there hasn't been any signal to the inverter board yet, how would it know it is bad?

[tom66]

Re: 40" Sony LCD KDL-40EX500 Seconds to black (6 blinks)

Marked as computer parts only...

[budm]

Re: 40" Sony LCD KDL-40EX500 Seconds to black (6 blinks)

There is classified forum for selling parts: https://www.badcaps.net/forum/forumdisplay.php?f=12

[tom66]

Re: 40" Sony LCD KDL-40EX500 Seconds to black (6 blinks)

Perhaps there should be a buy-sell forum on here for TV parts.

[budm]

Re: 40" Sony LCD KDL-40EX500 Seconds to black (6 blinks)

You should put up a list of parts for sale.

[tieny]

Re: 40" Sony LCD KDL-40EX500 Seconds to black (6 blinks)

I always have trouble selling inverter boards, many of them I salvaged from samsung and sony TV's but theyre only worth about $20 or less. I usually post mine as the lowest price of them all but then sometimes it not worth the shipping hassle

[tom66]

Re: 40" Sony LCD KDL-40EX500 Seconds to black (6 blinks)

That is why I like some newer TVs for parts. More people are collecting spare parts from cracked screen TVs (mostly damaged in shipping) now so the prices fall. I just started selling parts for a 42" Samsung plasma, 2011 model, which had a Wii controller hit it. Each board now only sells for about £5 each, because there's a surplus of them in the market. This is good for buyers, bad for sellers -- but I'm mostly a buyer so it's good overall. And since most TVs get damaged in shipping the parts are practically new.

[budm]

Re: 40" Sony LCD KDL-40EX500 Seconds to black (6 blinks)

Well, please keep us up to date, that is very cheap for SONY parts.

[tieny]

Re: 40" Sony LCD KDL-40EX500 Seconds to black (6 blinks)

I had already made the order. Just wanna see whats causing this problem.

[tom66]

Re: 40" Sony LCD KDL-40EX500 Seconds to black (6 blinks)

I'd just go for the board at $12. It's pretty unusual for the bulbs to fail without showing obvious signs (pink colour/flickering/dimmer than the rest, etc.)

[tieny]

Re: 40" Sony LCD KDL-40EX500 Seconds to black (6 blinks)

Ebay is selling a bunch of these inverter boards for only about $12 including shipping, pretty cheap.

Even though the lamps are able to turn on prefectly, is it possible for it to still be bad?

I measured both diodes and they give me 9.5VAC

[budm]

Re: 40" Sony LCD KDL-40EX500 Seconds to black (6 blinks)

I hope it is not the lamp.

[budm]

Re: 40" Sony LCD KDL-40EX500 Seconds to black (6 blinks)

Service manual:
http://elektrotanya.com/?q=showresul...oria=&kat2=all

You may want to look at shopjimmy for the replacement Inverter board.

[tieny]

Re: 40" Sony LCD KDL-40EX500 Seconds to black (6 blinks)

So AC voltage, black probe on right pin and red on the left pin?

[tom66]

Re: 40" Sony LCD KDL-40EX500 Seconds to black (6 blinks)

3.6V is too high (will cause shutdown... normal working voltage 1~2V), so measure each of the two pins adjacent, and we will find which bulb or transformer is causing the problem. (Use volts AC.)