KDL-46EX621---No Power/No Standby---Bad PS?

[ALR]

I have this Sony Bravia that is dead in the water. No standby and no voltage readings on connector. I do hear a very faint buzz sound when the mainboard is connected to the PS but when disconnected, it's gone.

I tested the AC coming in and the 4 caps(450v per) and get 172 at each one. No Difference when pushing the ON/OFF button...

I figured with the way this one was setup, I can get the backlights to turn on by disconnecting the main to see if it's a main or PS issue but no luck. It looks like the backlights are powered by the LED driver board which runs directly to the PS.

Am I correct in assuming it's a PS issue? Will a bad main also cause no standby LED? I've been reading mixed things on no standby 3.3/5 and still coming out to be a bad main as to a bad PS...

[budm]

Re: KDL-46EX621---No Power/No Standby---Bad PS?

I do not know what the Standby Voltage for this model is, but if it does have a pin on the connector to tell you what it is, then check the DC voltage without having the main board connected and without the main board connected.
How about straight shot pictures of the power supply board and closed up around the connectors so we see the labels.

[ALR]

Re: KDL-46EX621---No Power/No Standby---Bad PS?

Sure, let me get the iPad out again. I didn't get any readings on standby at all(with connected and not connected on backside of PS), no voltage anywhere but the caps.

[budm]

Re: KDL-46EX621---No Power/No Standby---Bad PS?

I cannot find the service manual so I have no idea which connectors have the standby voltage and what the standby voltage is, 5V??, 3.3V???.
BTW, can you get the P/N as printed on the power supply board so I can see if shopjimmy will have good clear pictures of the board?

[ALR]

Re: KDL-46EX621---No Power/No Standby---Bad PS?

Does anyone know the standby blinking error code for this model?

[ALR]

Re: KDL-46EX621---No Power/No Standby---Bad PS?

It's 3.3v

[budm]

Re: KDL-46EX621---No Power/No Standby---Bad PS?

Ahh "I figured with the way this one was setup, I can get the backlights to turn on by disconnecting the main to see if it's a main or PS issue but no luck. It looks like the backlights are powered by the LED driver board which runs directly to the PS. " So that means the power supply board has biult-in pull up resistors for the PS_ON and the BL_ON. When the cable not connected, see what Voltage you have on the main filter cap.
Also try disconnecting the cable between the T-CON and the mian board to see what happen.

[ALR]

Re: KDL-46EX621---No Power/No Standby---Bad PS?

Did the best I could on it

[ALR]

Re: KDL-46EX621---No Power/No Standby---Bad PS?

When the main is plugged in, I get 171.3 on each cap and when I unplug, I get 172.1 on each one. No difference with T CON disconnected.

[budm]

Re: KDL-46EX621---No Power/No Standby---Bad PS?

Way out of focus for me to read. Any P/N on the sticker on the board?

[ALR]

Re: KDL-46EX621---No Power/No Standby---Bad PS?

Yeah it's the Sony 1-474-309-11 (Aps-298) G5 board

[ALR]

Re: KDL-46EX621---No Power/No Standby---Bad PS?

Here you go

http://www.wisiny.com/aps-2981-883-9...09-11-g5-board

[budm]

Re: KDL-46EX621---No Power/No Standby---Bad PS?

Is this the exact match to your board:
http://www.shopjimmy.com/sony-1-474-309-11-g5-board.htm
Sony 1-474-309-11
P/N 1-883-917-11?

[ALR]

Re: KDL-46EX621---No Power/No Standby---Bad PS?

Yeah, that's it.

[budm]

Re: KDL-46EX621---No Power/No Standby---Bad PS?

Since this power supply is also used in KDL-46EX620, 720, 723 per shopjimmy.
So these service manual may help:
http://elektrotanya.com/?q=showresul...oria=&kat2=all

[ALR]

Re: KDL-46EX621---No Power/No Standby---Bad PS?

Thanks for the link...Wish these SM's had a troubleshooting guide ha Trying to figure the schematic out on it.

[budm]

Re: KDL-46EX621---No Power/No Standby---Bad PS?

So do you see page 11 for the standby LED blinking code? The 17MB download. It has flow chart for troubleshooting the error codes, but it does not have SCH.

[ALR]

Re: KDL-46EX621---No Power/No Standby---Bad PS?

Okay I got it. I checked the cn6001 on the Mainboard and on pin 10 I got 3.3v By going by the chart, it's saying replace the Mainboard? I just bought a power supply on Ebay earlier today but was second guessing myself. Guess I should have came on here yesterday. Luckily, it's not shipped yet!

Also, I recall the guy I got it from saying it flashed 4 times(Balancer error) and when I hooked it up the other day, I got nothing, no standby. After reading some more on it, I guess Balancer error leads to Mainboard as well and with the flow chart saying replace Main, I guess that's what I'm gonna replace. Am I right on these assumptions before ordering the board?

[ALR]

Re: KDL-46EX621---No Power/No Standby---Bad PS?

I cancelled the power supply shipment and waiting for the refund to order a Mainboard for the TV. Anyone else see any other issues that I'm not seeing?

[budm]

Re: KDL-46EX621---No Power/No Standby---Bad PS?

You may have more than one problem, but right now we need to at least get it to show some activity when power switch is activated, so hopefully the main board will fix this problem first.