Re: Sony KDL-46R450A No Power, No red LED status

Just as a follow up, I did replace the mainboard and TV is back and running.

thank you again for the help

Re: Sony KDL-46R450A No Power, No red LED status

He absolutely did nail it in one post !

Thank you to the both of you for the help and the double checking.

Re: Sony KDL-46R450A No Power, No red LED status

in any combination I do hear the clicks.
Last combination was everything unhooked from mainboard (Cable ribbons and cables) leaving only cable from powerboard to mainboard and sadly I still hear the clicks.

edit: sorry forgot to say: right, if cable from power board to mainboard is disconnected i don't hear the clicks

Re: Sony KDL-46R450A No Power, No red LED status

I just tried adding another 1k ohm to blkt_en and this time yes, I do have backlights on. Does this confirm a faulty mainboard ?
thank you for all the help !

Re: Sony KDL-46R450A No Power, No red LED status

Thank you for the reply

I just tried adding 1k ohm from standby to bl_cntl keeping the other one there as well and no backlight came on.
Cable from powerboard to mainboard disconnected, just LED cable connected to powerboard (CN6801)

Hello all,

I've been trying to solve this issue and maybe someone can make me check in the right direction.
Sony KDL-46R450A no status red LED, no Green LED, no power. TV wouldn't turn on 6 hours after beeing turned off last week
PSU 1-888-122-12 (GL5 APS-350)
Some kind of relay click is present on PSU. repeats every 4-5 seconds.Power button pressed makes no difference.

Cable to mainboard voltages measured at different pins
Ground taken from Ground Screw on secondary in all tests (except for Primary cap)
(PSU AS IS still hooked up from inside...

Re: New Members - please post your introductions here

Hello,

have not been an active user for some time, but I do enjoy fixing things as a hobby. The infos I found here have been absolutely priceless.

thanks to all