Yes, i have already done that. TV is working fine. Thanks for your input.

Regards
Angelos

Hi guys,
I don't know what I did previously but I over complicated things. There was a electrolytic (470uf 16V) that i had measured directly in circuit with my ESR meter and this was my mistake.
I measured fine in circuit but in fact it was 450uf @5 ohms. I feel like a real dumbass. Must have had a bad day. LOL. Check picture. This cap sits on the feedback circuit to the TL431 and opto. Duh?
So its fixed and on a soak test. Thanks for your comments guys.

Regards
Angelos...

Hi Davi,
I finally received all the parts that i needed to diagnose the fault.
The mains smoothing cap measures 215uf @ 0.62 ohms ESR (should be a 220uf), no issue there. I mean i do get 390V DC on the cap when PFC circuit is enabled.
I then changed the TL431, PC817 and the NCP1207A. There was no difference.
I am going to have a look now at individual components on the feedback circuit, one by one i will remove them and test them. Will also replace all electroytics just for safety.
I will also upload a full view of the power supply, perhaps it rings a bell for someone?...

I am here Davi, i am going to work on the unit on Saturday. Then i will update.

Regards
Angelos...

Hi Davi,
I am definitely not having a nap.
I am looking for the NCP1207AP chip, i have alrerady got TL431 and also PC817 but i want all the parts before i reopen the tv.
I need to get it sorted out. Unfortunately i only get to work on weekends to do repairs as i have a primary job.
I will check you informed when i have more info.
Thanks for keeping an eye on me.

Regards
Angelos

Hi Guys,
I have this 2008 lcd tv that uses ccfl lamps. The tv is stuck on standby. This is what I have noticed. The standby 5Vs voltage is not 5V but rather 3.28V. There is a 14V rail as well but that measures ok. I put my volt meter on the 5Vs rail and switch on the 220Vac. I noticed that the 5Vs rail goes to 5.1V and quicky changes to 3 28V and steady.
I unplugged the main board and ccfl lamp wires and tested the power supply separate from the tv without load and put a 470 ohm resistor to the stby rail to force the tv on.
1. Pfc circuit activates and mains smoothing cap is...

Hi Halen,
If the set does damage those ESD devices again, will you let this forum know. I am curious on the outcome.

Regards
A