Sony KDL-46EX400 2 blink error code

[budm]

Re: Sony KDL-46EX400 2 blink error code

Need to look at the circuit diagram of the latching circuit since it receives 3 signals (excessive 12v, excessive PFC voltage, excessive temperature) which any one of them can trip the circuit. It is a matter of finding out which one is tripping or the latching circuit may be at fault itself, this is where the diagram comes into play to narrow down the cause of the problem. You can disable one of the 3 signal at a time to find out which one is sending that signal to the latching circuit.

[tibimakai]

Re: Sony KDL-46EX400 2 blink error code

Hi Bud, did you have a chance to look at this TV?

Thank you,

Tibor

[budm]

Re: Sony KDL-46EX400 2 blink error code

I know I found the training manual but I do not remember fi you or I find the service manual for it or not, do you remember? It is a long thread and I just do not have the time to look through the whole thread again.

[budm]

Re: Sony KDL-46EX400 2 blink error code

Never mind, you have it on post 56.

OK, I will have to down load the service manual tonight:

[tibimakai]

Re: Sony KDL-46EX400 2 blink error code

I have just made an offer on Ebay for a mainboard($70). The TV has a broken screen, pictured in the ad and he is only a couple miles away from me, in Burbank.

[budm]

Re: Sony KDL-46EX400 2 blink error code

Well, that service manual does not have schematic diagram!

[tibimakai]

Re: Sony KDL-46EX400 2 blink error code

Picked up the board from the seller's store and installed it and it worked since Saturday. Let's hope that I won't have any issues from now on.
Most likely, the other mainboards were bad boards.
Thank you for the help.
Now, I need to go back to the LED LG 42LV3500 with the restarting issue? Any pointers?
I'm thinking, that I should pick up a mainboard for that too.

[budm]

Re: Sony KDL-46EX400 2 blink error code

Did you take the voltage readings so we will have a ref. info for the next time?

[tibimakai]

Re: Sony KDL-46EX400 2 blink error code

No I haven't.
Should I take all the voltages from the PS connector?

[budm]

Re: Sony KDL-46EX400 2 blink error code

Yes, we need to see the 12V, 24V and the PFC voltages, from you have posted, they are not at extreme level at all, this will tell us if the detection circuit is at fault or not. The more info you have the better. You might as well take some reading on the inverter board also like the LD, FB. The power supply board: BL_ERR, INV_ERR etc.
Take the reading when TV is off and when TV is on.

[tibimakai]

Re: Sony KDL-46EX400 2 blink error code

One thing that I have noticed with the bad board that the T_Con ON voltage it was almost missing(0.014V), this voltage should have started up the T_Con 12V to supply the T_Con.
In my opinion, there it was the problem.

[anthonystv]

Re: Sony KDL-46EX400 2 blink error code

I just got one of these things in
Thanks for all the research you guys have done thus far
but I have a delemma wether to invest anything in this or not
its a 2 blinker KDL46EX500
after looking at your schematics I got to power board to give me everything but backlight
the BL on from the main board is low all the time
but if i open it and provide my own 3.3v it still does not turen the BL on
the TCON on never goes high
but if i short the transistor as you stated it does put out tcon 12v
now here is the delemma since the power board should be able to produce a BL with BL on going high ....
I have nothing not even trying
the power board must be bad in this area
but the main board wont tell the BL to turn either or the tcon but it does tell the rest of the board to run audio 12 12v etc ...so it looks like i have a bad power board and a bad main do you agree
?? or does the power board need something else to fire HV for the BL?
dimmer???

[tibimakai]

Re: Sony KDL-46EX400 2 blink error code

Did you try forcing the power supply, to turn on with resistors from standby voltage to PS_ON and another one to the BL?
This way, you can see if the voltages are there and the backlight is working or not.

[Louis82]

Re: Sony KDL-46EX400 2 blink error code

Hello fellas.
I have same tv as anthonystv KDL46ex500. Tried the resistor 1k resistor between Stb3.3 and Power On and I'm not getting any 12v. My readings are all 0 except the Stb, Power on and Ac_off_det that read 3.3v. Any suggestions? Thank you

[rick_noname]

Re: Sony KDL-46EX400 2 blink error code

Check BAL board on up side behind cooling frame, Fuse F3703 smd 3,15 A blowed.
When it`s defective check also the little capacitor between fuse and ground. Most of the time is shorted. Removing the capacitor and replace the fuse and the TV is back working.

See picture:

I hope this will work. Also when the TV is not give any error but the green led is working check the same positions.

Greetings Patrick www.mofix.nl

[chrisl32]

Re: Sony KDL-46EX400 2 blink error code

sorry ... wrong thread