Kdl-55hx800 4 blink, no picure or sound

[Tom.molyn]

My pal gave me this tv for 40$(Steal!)

• The tv would power cycle initially.(no picture or sound)
  I was able to get 3.3v on the standby voltage at all times.
  The on power and high voltage would be on for the first 2 seconds inbetween "clicks"
  I replaced the BAL board and the same issue happened.
  I was able to keep the power from cycling when the T-con board was disconnected from the Inverter. (This allowes me to update the firmware and get picture and sound but no backlight)
  All the capacitors look like there in perfect condition.

I haven't tested the old BAL board without the inverter cable.

I'm reaching out for input on this, I am debating purchasing a new Inverter board at the moment but i am unsure how to rule out the T-con.


Thank you for your support All Great Ones.

-Thomas

Note:will upload service manual, and pictures when i can.

[Tom.molyn]

Re: Kdl-55hx800 4 blink, no picure or sound

Here's a photo, and below is the service manual.

https://docs.google.com/file/d/0B8oy...p=docslist_api

[budm]

Re: Kdl-55hx800 4 blink, no picure or sound

So you have 4-blink code not 5-blink. See:
https://www.youtube.com/watch?v=oE6K4xBVweA

Same idea.

You should also check the DCV on the SMD fuse on the T-CON board.

[Tom.molyn]

Re: Kdl-55hx800 4 blink, no picure or sound

I think i located 4 smd Fuses marked R in green on the inverter, i will test them now.
Can anyone see any through the potato picture I uploaded?

Edit: all 4 are fine in circuit on the inverter.

Tested some pads and discovered that when it starts it gets a high voltage of about 24v by the power supply inputs, it then slowly drops to about 15v where the power relay clicks off. It then continuously re-cycles.
This is the same near the ribbon cable test pads, about 12v is the high and the voltage drops.
Sound like a bad cap?

Also i get no voltage from the pads when the cable from the inverter to the t-con board is disconnected.(i think this is due to its control over the variable brightness)

[budm]

Re: Kdl-55hx800 4 blink, no picure or sound

There is the fifth one with 'H' (1A 63V) on top.
So this is LED backlights TV which does not have Balancer for the CCFL, it looks like the BAL board is the main board it is referring to.
It has LED driver board which probably controlled by the T-CON board for Dynamic contrast function.

[Tom.molyn]

Re: Kdl-55hx800 4 blink, no picure or sound

You are right there is a 5th, I just tested it and it shows good in circuit.

I'm about to order another board, any suggestions? There is a restocking fee at shopjimmy.com that I wouldn't like to pay twice.

[budm]

Re: Kdl-55hx800 4 blink, no picure or sound

So you did replace the BAL (Main board)?
It may be good idea to ask SHOPJIMMY as what they think the problem may be.

[Tom.molyn]

Re: Kdl-55hx800 4 blink, no picure or sound

I have and I've gotten the tv on without the inverter board plugged in.(no blinks)
Tried both boards this way, both work the same.

[budm]

Re: Kdl-55hx800 4 blink, no picure or sound

Hmm I wonder if the error code is correct then, it is pointing to the LED driver board. I am not 100% sure as to what is going on here.

[Tom.molyn]

Re: Kdl-55hx800 4 blink, no picure or sound

The manual also points toward the Panel(balancer), I cannot tell if its refering to the T-Con or the Inverter(Driver)
the tv says its an LCD but it could be powered by LED bulbs or CCFL. I do know that it is edge-lit(variable) which makes me think LED's.

[Tom.molyn]

Re: Kdl-55hx800 4 blink, no picure or sound

So you have 4-blink code not 5-blink. See:

You should also check the DCV on the SMD fuse on the T-CON board.

Which fuse are you referring to?

[budm]

Re: Kdl-55hx800 4 blink, no picure or sound

There should be very small SMD fuse on the T-CON board (the board connected to the LCD panel), but at this point it does not look to be related to the T-CON because you do not get the blinking error code when the LED driver board is disconnected.

[Tom.molyn]

Re: Kdl-55hx800 4 blink, no picure or sound

Yes, however the driver board is plugged into the T-Con board,
but on the other hand i still get full(picture and sound) functionality without the Driver plugged in.

I took a picture of the t-con board
https://www.badcaps.net/forum/attach...9&d=1426885347

I do see what looks to be a Fuse near CON10, which is by the power supply port.

this is probably irrelevant but i have a Power Saving switch on the side of the tv, when switched off i get no response even with the inverter disconnected but i do get Standby and a Green LED on the front.
Also when the LVDS cable is disconnected i get code 5(T-Con) which is to be expected.

I've also considered manually powering the LED's in order to test them, I'm unsure of the Voltage/Amperage, I also have no idea how i would do this.

[budm]

Re: Kdl-55hx800 4 blink, no picure or sound

The reason there is connection between the LED driver board and the T-CON is that it uses T-OCN to control the brightness of the LED depending on the scene of the video to give you that fake high Dynamic contrast ratio spec.
http://www.cnet.com/news/contrast-ra...r-lies-to-you/

[Tom.molyn]

Re: Kdl-55hx800 4 blink, no picure or sound

yes lol on the spec sheet it shows infinite contrast because it can turn them all the way off

6. Dynamic contrast ratio compares the luminance of a 100 IRE (white)
signal with that of a 0 IRE (black) signal. When the TV receives a 0 IRE
signal the backlight is turned off and the luminance measurement is
0.00 cd/m . The resulting dynamic contrast ratio is infinite

See:

So than i feel like I'll test a new Driver board.
I wasn't able to find a REV:03 model so i hope the REV:02 works :/
http://www.ebay.com/itm/Sony-KDL-55H...tem3f44053ddc#

[Tom.molyn]

Re: Kdl-55hx800 4 blink, no picure or sound

Update!

New inverter is in, the backlight now powers up!
That is for about a minute.
After about a minute it powers off with code 6.

Swapped out the BAL board to the new one I'm about to return, resulted with the same issue. The service manual points to the G board, i can only assume the power supply(g4e).

Another thing to note is that in the upper left corner theres a dark area like the LED isn't lighting up.

The BAL board doesn't have Panel_Fail as the service manual requests.

http://www.justanswer.com/tv-repair/7rpqt-hi-sony-kdl46hx803-when-turning-on-quickly.html#re.v/135/

Pin 3 of CN2561 is giving 3.34v when off and when it turns on i get the same but it will ocasionaly fluctuate lower around 1.8v.
When the Power Supply clicks off i get a reading around .84v

[budm]

Re: Kdl-55hx800 4 blink, no picure or sound

I really do not know at this point since the service manual does not seem to match to what you have, so the JL2565 it is referring to in page 29 for 6-blink error code is not there?

[Tom.molyn]

Re: Kdl-55hx800 4 blink, no picure or sound

It's not I found another post which point it to a different pin.

No matter though!
I discovered that the lights weren't leading up because the ribbon cables weren't flat against the board? I don't know why but all I had to do was press and down with a piece of tape.
It's been going strong for probably about an hour now without any more codes.

Thank you so much for the assistance ^.^
I owe you one budm, is there anyway I can show my appreciation?
I'd be more than willing to tip you, how about a paypal account?

[milkman6453]

Re: Kdl-55hx800 4 blink, no picure or sound

The dark spot went away as well?

[Tom.molyn]

Re: Kdl-55hx800 4 blink, no picure or sound

Yes, the ribbon cables must not have been making good contact, or weren't grounded?
To be honest i have no idea why i needed to tape them down, they were in nice and tight with all the plastic fasteners in place.
I have seen ribbon cables that needed to be grounded underneath but these don't have a pad on the underside.