Sony KDL37S5600 power error

[CasasElectronics]

Hi, a friend has brought me the a sony kdl37s5600 motherboard, which has the problem of 5 pulses blinking red led. Thinking that the issue could be the power supply, I've tested the board with my supply, having the same response.
I've tested all the voltages(supply and dc-dc converters) and all are good at the beginning(because during the red led blinking the voltages disappear).
In my test conditions i dont have the tcon, so i'm testing the motherboard without it.
I've thought that the problem will be in my friend's tcon, because if this board has a test voltage which it's measured by the motherboard and it isn't present it will give an error, that is the same error that I've testing the motherboard without tcon.
I don't have found the schematic to check other poer on voltages, but i think they'll be present.
Thanks a lot,
Waiting your responses.

[diif]

Re: Sony KDL37S5600 power error

Search for service manual not schematic.
The LED flashing 5 times is a NVM error.

[CasasElectronics]

Re: Sony KDL37S5600 power error

I've tried to enter the TT menu, because i've seen in the manual that i can enter the number 41 to restart the NVM, but i can't do that, i've pressed the three keys to enter the mode during 5 seconds and the red key 2 times before pressing 41, without having any response.
I've tested if the TV responds to the power off pulse of the remote control but it doesn't respond, and I think that the blocking status of it doesn't allow to enter that menu.
I also cannot see anything on the screen because i don't have the t-con.
Thanks a lot.

[nomoresonys]

Re: Sony KDL37S5600 power error

Would probably be a lot easier to troubleshoot if you had the whole tv.

[CasasElectronics]

Re: Sony KDL37S5600 power error

With the whole tv I have the same response, it seems that the operating system is fully locked, and it doesn't respond to the remote signal.
I have thought two alternatives: or search for the NVM memory and replace it (I don't know where it is located, the component name) or search for a new motherboard.
What do you think?

[diif]

Re: Sony KDL37S5600 power error

Both the Nand and repair service are available on eBay in your country.

[nomoresonys]

Re: Sony KDL37S5600 power error

Try this test, with tv unplugged from mains, unplug cable from powerboard to mainboard, plug mains back in, what if anything is displayed?