Sony KDL-55HX820 5 red blinks

[Clutchbox]

Re: Sony KDL-55HX820 5 red blinks

I just Picked up this TV. I would really like to fix it. I turn it on and get 5 red blinks. I understand this error means T-Con but I was also told it could be a panel. I will take some pictures when I get the back off and post them as well.

I see at your first startpost after opening of the TV, that the connector on the T-con (from the cable between mainboard and T-con) is not seated correctly. Such a thing could just give you the '5-blink T-con' Error from the start.

Was that picture taken when you first opened the TV?

[ntehicks]

Re: Sony KDL-55HX820 5 red blinks

I think I have removed and reseated the Cable between the mainboard and the T-con but when I get home tonight I will double check this again.

I have tested several fuses on the main board and they are all testing good. where should I test?

[Sevenqi]

Re: Sony KDL-55HX820 5 red blinks

I fixed a kdl-46hx820 same error code, what I did was to unplug the cable fron main board to t-con, press the power button, it could turn on, then power off, connect back the cable, tv worked again.
This is not a way to fix tv, but it's simple and worth a try.

[ntehicks]

Re: Sony KDL-55HX820 5 red blinks

I will try that as well and see what happens.

[ntehicks]

Re: Sony KDL-55HX820 5 red blinks

Ok tonight I came home and disconnected the cable between the T-con and main board. I plugged in the TV and the standby light came on. I then pressed the power button and the standby light went out. I pressed the power button again and it went green for half a second and then red 5 blinks pause red 5 blinks over and over.

[nomoresonys]

Re: Sony KDL-55HX820 5 red blinks

heres a question, does both of your power supply boards give you the 10.8 volts where you should have 12 volts?

[ntehicks]

Re: Sony KDL-55HX820 5 red blinks

I will test both of them when I get home tonight just to double check. I have purchased both power boards and tested with them and I get the same results. I have a new main board coming.

[ntehicks]

Re: Sony KDL-55HX820 5 red blinks

ok so this tv has a vacation switch. so when I plug in the TV and then turn on the vacation switch while having my meter connected to the power supplies 12v I get 12.7 volts for about a second and then it drops to 10.7. This is while the tv is in standby so before I hit the power on. Then when I hit the power on button the 10.7 jumps back up to 12.7 for 1 second and then drops to 0. this is when the TV starts to blink for 5 times.

[tibimakai]

Re: Sony KDL-55HX820 5 red blinks

If I remember well, there it should be a shorted special VDO near the PS connector.
After replacing that, I had to replace the mainboard too. Wrong voltage, damaged something on the mainboard.

[ntehicks]

Re: Sony KDL-55HX820 5 red blinks

are you talking on the power supply board or on the main board? do you know what the part should look like?

[tibimakai]

Re: Sony KDL-55HX820 5 red blinks

On mine(different model though-55EX720), it was on the power supply. It was a 5 pin voltage regulator.

[ntehicks]

Re: Sony KDL-55HX820 5 red blinks

so the last board that the service manual suspects is a very small board. the HLT2 board or other words the IR board. part numbers 1-732-388-11 or 1-883-757-11. I have looked for this board and don't know if I will find one. If I can find one I will purchase and install and see if that resolves anything.

[freakaftr8]

Re: Sony KDL-55HX820 5 red blinks

Make sure the ribbon cable going from the main board to tcon is OK where the plastic clip holds it to the main board. I have seen the ribbon cable get pulled from the plastic retainer clip before and caused damage to the cable.

[ntehicks]

Re: Sony KDL-55HX820 5 red blinks

Well this one is going to go. I have replaced all of the power supply and main board. tested voltages and still no go. so I am sending this one packing.

[ALittlebit]

Re: Sony KDL-55HX820 5 red blinks

Hey every one did we ever find a cure for this annoying 5 blinks issue?! I got mine from a pal and he said he changed main, and PS, and still got nothing better as results. I was thinking tcon board seeing how he never replaced that one. But who is to say he didn't get a bad main or ps off line. So anything helps thank you guys!