Saumsung le40b554m2w; Sound but no picture

[donst]

Re: Saumsung le40b554m2w; Sound but no picture

Hi mate, no problem i can see your busy with a few people and it's pretty easy to miss posts when threads here move so rapidly.

I've measured the pins on PCI801S and for 1 and 2 i am getting 140V and 110V, and for pins 3 and 4 i am getting nothing whatsoever. It's also worth pointing out that when measuring pins 1 and 2 the picture turns on for around a few seconds then flickers and switches off and then back on again. This pattern continues until you remove the leads.

[tom66]

Re: Saumsung le40b554m2w; Sound but no picture

OK, it seems like you have a fault with the UVLO circuit. This is a common fault on these models. Generally, placing a solder jumper across the pins 3 and 4 of that optocoupler will fix this issue.

[donst]

Re: Saumsung le40b554m2w; Sound but no picture

Ahhh sorry totally missed your posts. Please identify if there is a small black, 4 legged device on your board labelled PCI801S. It will cross the boundary between primary and secondary. If so, please check the voltage between pins 3 and 4, the only two leads on the secondary side.

Hi mate, just wanted to say thanks, only got round to the soldering today and it worked a treat, the picture is fine.

Thanks again for your help, much appreciated!

[tom66]

Re: Saumsung le40b554m2w; Sound but no picture

Glad to hear! Enjoy.

[jamessblakey]

Re: Saumsung le40b554m2w; Sound but no picture

Hi guys i have exactly the same problem can anyone help me do this fix, ive heard that theres a jumper you can chop in half that resolves this problem please can someone help me tv is flickering like mad and sometimes screen just goes black with sound. if i unplug tv for few hours it will work fine for few hours? then start flickering qhite then start flickering black then finally stay black with sound. your help will be really appriciated