Sony KDL-46EX400 2 blink error code

[tibimakai]

Re: Sony KDL-46EX400 2 blink error code

I will get one from shopjimmy, just be sure that is good.

[kdh2012]

Re: Sony KDL-46EX400 2 blink error code

Hey Guys,

I just got in a KDL-40ex400 with the 2 blinks. I changed out the main board to fix it. We'll see if it holds.

It originally came into the shop with 6 blinks. I modified the inverter slightly to keep it from dimming quite so much (that is what was triggering the error).

After about a week, it came back in with the 2 blinks. After changing the main board, I removed my mod and it went back to 6 blinks. I put the mod back in. So far, so good.

[tibimakai]

Re: Sony KDL-46EX400 2 blink error code

I have replaced the T-con and there is no change.

[tibimakai]

Re: Sony KDL-46EX400 2 blink error code

Need to get back to this TV.
I would like to find out, if BL_ERROR should be 3.3V right after I plug ing in the power cord? It shouldn't be 0V when there is no fault?

[tibimakai]

Re: Sony KDL-46EX400 2 blink error code

Nobody can answer to my question?

[tibimakai]

Re: Sony KDL-46EX400 2 blink error code

I try it again.
When the TV is working well, the BL_ERROR should be 0V or 3.3V?

[tom66]

Re: Sony KDL-46EX400 2 blink error code

Probably 0V, but that's a guess, because nobody except Sony know for sure. most pins are marked by what they are in the active state. E.G. PS_ON rather than PS_OFF.

[tibimakai]

Re: Sony KDL-46EX400 2 blink error code

This is a shopjimmy picturte. What do you think that would mean 3.3 V at BL_ERROR?

[tom66]

Re: Sony KDL-46EX400 2 blink error code

I don't know what you mean. My reasoning for my guess is above, but as I said, it's only a guess.

[tibimakai]

Re: Sony KDL-46EX400 2 blink error code

I'm trying to find out if I have a BL_ERROR or it is normal to have that 3.3 V there.
I have replaced every board on this TV, mainboard even three times and I'm still getting the 2 x blink error code.
I have tried measuring the balancer transformers as in the Youtube video, but it doesn't work on this TV, I guess that is a Samsung thing only.
I haven't checked the tubes yet.
If I force all the voltages to come on they come on and the tubes light up, though I don't know if all turn on or not.

[tibimakai]

Re: Sony KDL-46EX400 2 blink error code

Bud found this training manual.
I think that this one is the best that I can use for this TV.
Hopefully I will have some time in the next couple of days and try checking some voltages using this manual.
BL_ERROR show 0V in this manual, on page #21.

[Danga]

Re: Sony KDL-46EX400 2 blink error code

From my little experience:
In a fully working Sony LCD/TV set
I've seen BL_ERR is set to HI (3.3v) and BL_ON is set LO in standby mode. It's just normal. And the situation is reversed when the set is on.
So BL_ERR and BL_ON are just used as triggers of the lamps and not necessarily to indicate real errors.

I'm sure this info can be backed by the more seasoned members of the forum.
P.S. I can't understand why this simple thing has not been said by the many, many people that have answered to your questions

[tibimakai]

Re: Sony KDL-46EX400 2 blink error code

I get back again to this TV.
Any input would be appreciated. I'm decided that I will have to get to the bottom of this TV.
On page 22 on this SM BL_ERROR shows 0V, but that is when the TV in STBY mode?
Mainboard sends a 2.7V when I disconnect the wire from the connector. It's not visible when I connect it back to the connector, maybe 0.1V the most.
I have placed 3V at the end of the T_Con ON wire and nothing changed. The T_CON 12V turns on with this 3V applied to the T_Con ON wire.
Since the mainboard sends the signal to turn on the T_Con, then I'm excluding the mainboard to be the problem here.
I'm testing the balancer board right now. Then I will look closely at the PS.
Any ideas while I'm at it it would be greatly appreciated.
This is an answer to a recently posted idea on the 40EX400 thread.
I have tried unplugging the LED/IR LED board. but didn't change a thing. I'm not even sure if it turns on at all completely, without this little board connected. That one maybe works on the 40" size EX400. I can hear the relay clicking on and then off though, but I can't see the code, this way.
There is mentioned that the AU12V if it's to high, can trip this error. I'm measuring 12.73V there, that would be to high?

[tibimakai]

Re: Sony KDL-46EX400 2 blink error code

On page #34, shows the tree how to troubleshoot the 2x error code.
The question is 12.73V it's to high, or it's fine?
If it's fine, then it is the A board(mainboard) causing this error, right?

[tibimakai]

Re: Sony KDL-46EX400 2 blink error code

No ideas?

[budm]

Re: Sony KDL-46EX400 2 blink error code

Just the other SONY LCD (other training manual, remember the other SONY we worked on that has bad master inverter board that we spent so much time narrow down to master inverter), the BL_ERROR is the inverted signal of the LD, the LD SIGNAL from Balancer board is fed into the inverter board which has invert Logic circuit that converts the LD HI to LO and that is fed to the main board. if the fault detected by the balancer, the LD will go LO which is then inevrted to HI and that will trigger the ERROR CODE for BL_ERROR.
"So BL_ERR and BL_ON are just used as triggers of the lamps and not necessarily to indicate real errors." That is not correct statement, BL_ERROR is not used to trigger the lamp, it is a generated signal of the failed lamp to tell the main board that some thing is wrong with the lamps. BL_ON is used to turn on the inverter circuit to generated the HIGH voltage to light up the lamps, if the inverter circuit fail to generate the high voltage, then the INVR_ERROR signal will be generated and sent to the main board and generate the INVR_ERROR CODE.
So the bottom line is BL_ERR should be LO in normal operation, HI = BAD (LD is LO, normal LD is around 12VDC).
Are you having 2x CODE? or 4X code?

[tibimakai]

Re: Sony KDL-46EX400 2 blink error code

2 X.
TV clicks on and then right off showing the 2x error code, no backlight at all.
In that training manual, for the BL_error it shows 0V and I have over 3V there.

[budm]

Re: Sony KDL-46EX400 2 blink error code

3V in standby or when TV is power up, but at this point you will have to fix the 2X code first which has nothing to do with BL_ERROR.

[budm]

Re: Sony KDL-46EX400 2 blink error code

OK, on page 23, you can see 15V Zenner diode that is used for the excessive 12V power supply output detector, if the 12V line goes to 15V, the Zener will be bias on which is then fed to the Latching circuit, same for the 24V power supply which uses 30V Zener for detction.
So 12.73V is not excessive voltage to bias on that 15V Zener.
Excessive PFC and excessive PFC temperature can also trigger 2X code, page 18.

[tibimakai]

Re: Sony KDL-46EX400 2 blink error code

24V is for the smaller TVs, I don't have that. I think I have only multiple 12V.
How do I know if there is an excessive temperature protection is tripped?
I have 390V so there is no over voltage tripped.
I don't have a standby situation. As soon, as I plug in the TV, it turns on and then right off.