bn4400261b or main board fault

[is_it_a_bird]

HI

I have a Samsung LE32b530 and it is not coming out of standby.

Downloaded the schema from another forum post(thanks Tom) and checked all the likely suspects ie fets fuses cold joints, all ok

If I power up the tv with the main disconnected I get

on/off = 1.51v
inv on/off = 2.09v


As soon as I plug the main board back in both these voltages go to zero

The 5.3 pin stays constant with main plugged in or out at 5.24v

Any ideas, could this be a main or a psu/inverter fault

I dont get a backlight flash either with main connected/disconnected

Thanks for any help

[truep]

Re: bn4400261b or main board fault

With it plugged in, check the PS on pin on the power supply.
First with the power off, and then with it on.

[is_it_a_bird]

Re: bn4400261b or main board fault

0v with main board connected 1.51v disconnected

I should add that the standby light is solid and not doing anything when pressing side buttons, if I remember rightly when you plug samsungs in the standby light starts flashing, but I may be wrong

[tom66]

Re: bn4400261b or main board fault

Sounds like main board fault, first place to check would be voltage regulators and core supplies.

[is_it_a_bird]

Re: bn4400261b or main board fault

Sounds like main board fault, first place to check would be voltage regulators and core supplies.

Cheers Tom, just one worry, when you disconnect the main from the ps/inverter shouldnt the backlights do their two seconds and shut down??
If so they dont :o(

[tom66]

Re: bn4400261b or main board fault

Depends on the design, some Samsung are different.

[is_it_a_bird]

Re: bn4400261b or main board fault

Depends on the design, some Samsung are different.

Right OK, will have a look at the main tomorrow, thanks for all your help :o)

[is_it_a_bird]

Re: bn4400261b or main board fault

Hi

Just plugged the TV in and it is now responding to the side buttons and remote, so I did a master reset

"press exit for 12 seconds"
"press "left""
"Press Enter"

Now I have done the reset that bloody annoying turn on sound has come back, and I can see OSD but not a blink from the backlights not even the flash and shut down.

Any pointers please

[Th3_uN1Qu3]

Re: bn4400261b or main board fault

Do you now get voltages on the on/off pins of the inverter?

[is_it_a_bird]

Re: bn4400261b or main board fault

Do you now get voltages on the on/off pins of the inverter?

I am getting a steady 4.45v

[budm]

Re: bn4400261b or main board fault

Any pictures of your boards?

[pkunzip123]

Re: bn4400261b or main board fault

I have a samsung le32b530p, when powered on i have no backlight with faint display, if i disconnect the mainboard, the backlight runs but of course there is no display because mainboard is disconnected

Please help, i have some knowledge of lcd tv's, and can use a multimeter, any help is much appreciated

[selldoor]

Re: bn4400261b or main board fault

Did you read the post just above yours?