samsung le37c630k1w standby lights but no power on

[Xristakis795]

hi to all
at first the problem of tv is has light on standby but if i press or fron the remote control or fron the power button to be on it retains on standby
on the above tv i have download the service manual of power supply bn44-00339b from electrotanya
when i remove the plug cn802 from mainboard i measure in pin 1,3,5,17 12.5 volt
on pin 16 5.2 volt and on the pins
11, 13, 14 4 volt maby i have problem here i think must be 5 volt right ?
and on the plug cni801 i can measure on the pins 10 ...14 24 volt and the backlight is on normal
but if i connect the mainboard with the plug cn802 the voltages on the pins 1,3,5,17 are not steady variable from 0 -12 volt the same happens and on the pins 11,13,14 variable from 0-4 volt
can anybody tell me if the problem is on power supplu or mainboard ?
thanks in advance

[dskall]

Re: samsung le37c630k1w standby lights but no power on

Looks like you may have a mainboard problem.

[Xristakis795]

Re: samsung le37c630k1w standby lights but no power on

from your exprerience something is short on the minboard and causes this problem or the better is to find used mainboard from ebay ?
and on the pins which must have 5 volt and measure 4 volt you thinks i havent problem ?

[nomoresonys]

Re: samsung le37c630k1w standby lights but no power on

check the voltage regulators on mainboard.

[nomoresonys]

Re: samsung le37c630k1w standby lights but no power on

did you try unhook the cable from mainboard to tcon, then see if those voltages are still unstable?

[Xristakis795]

Re: samsung le37c630k1w standby lights but no power on

yes sir i did this the same result
you mean the regulators of the mainboard right ?
i will measure and i will write about
as about as the voltage of power supply instead 5 volt i have only 4 volt on the particular pins wich tell you above do you think is this the reason to cause the problem ?

[CapLeaker]

Re: samsung le37c630k1w standby lights but no power on

Missing PSon is most of the time a problem with the mainboard’s main IC. Nothing much you can do about it besides replacing either the board or the IC.

[Xristakis795]

Re: samsung le37c630k1w standby lights but no power on

for what particular ic do you mean sir ?
and the voltages when the plug of power supply connected to the mainboard
which variable from 0 - 12volt its not mean something like short on the main ?

[nomoresonys]

Re: samsung le37c630k1w standby lights but no power on

voltage testing: https://www.youtube.com/watch?v=ocqnqmBxiqY

[Xristakis795]

Re: samsung le37c630k1w standby lights but no power on

thanks
i have seen this video
its very good