help sony kdl-52v5100 dead!!!

[mattstolte]

so I got this set its dead guy said when we had storm it went out. it has no lit led outside for power or no blink code so 1st think I did was check stand by voltage its suppose to have 3.3v well its less then 1v so I get new power supply and same thing? im not to good with these sonys but still no standby it should be bad power supply right? is it possible the power supply I received was bad? just don't make sense that they both have under 1v, so im thinking its something else?

[mmartell]

Re: help sony kdl-52v5100 dead!!!

Unplug the main board from the supply then check what your standby voltage is.

[CapLeaker]

Re: help sony kdl-52v5100 dead!!!

I think the main board is dragging the PSU down.

[mmartell]

Re: help sony kdl-52v5100 dead!!!

Exactly

[mattstolte]

Re: help sony kdl-52v5100 dead!!!

i have unplugged the main and same thing

[CapLeaker]

Re: help sony kdl-52v5100 dead!!!

unlplug everything from the PSU and just plug into the outlet. See what happens.

[mattstolte]

Re: help sony kdl-52v5100 dead!!!

Samething

[mattstolte]

Re: help sony kdl-52v5100 dead!!!

actually no voltage. im not familar with working on these sonys but no voltage is present when everything unplugged, then when i plug main it goes to about half a volt

[dick_barton]

Re: help sony kdl-52v5100 dead!!!

Hi,
I has a set recently for repair which was dead. No power up light, no blinking of front led.
The 5V standby voltage was not present. When scoping it, I found that on initial switch on 350V to a transformer primary feeding a SMPS IC came up which provided a 5V pulse on the secondary of the transformer. This 5V output was also coupled to the input of an opto-isolator the output of which was connected back to the SMPS IC that took it out of standby.
The opto wasn't working and replacing it repaired the power supply.
Just a thought?

[CapLeaker]

Re: help sony kdl-52v5100 dead!!!

I guess we need hi res pictures from the PSU and the connector area so we can see the pinout.

[mattstolte]

Re: help sony kdl-52v5100 dead!!!

hi,
i has a set recently for repair which was dead. No power up light, no blinking of front led.
The 5v standby voltage was not present. When scoping it, i found that on initial switch on 350v to a transformer primary feeding a smps ic came up which provided a 5v pulse on the secondary of the transformer. This 5v output was also coupled to the input of an opto-isolator the output of which was connected back to the smps ic that took it out of standby.
The opto wasn't working and replacing it repaired the power supply.
Just a thought?

i dont know what the opto is can you please send me better detail thanks. I even changed power supply from a used one and same thing...