KP-46WT520 9 Blinks

The switching regulator is in the switch mode supply but if that is bad most likely nyou will find other parts bad too.  Your problem could be on the "G" board or the "D" board.  Hope this helps.

I pulled the "G" board over the weekend and brought it in to work (we make power supplies for medical equipment).  They didn't think it was the correct board.  They will test it anyway.  I will pull the "D" board tonight and bring it in tomorrow.  Thanks for you help!

Any idea on where I can find the schematics on the boards?

If you have pando I can send it to you via e-mail or you can buy it for 29 bucks online. pando.com is free. I need somewhere to send the manual if you want it.

I have Pando now.  Thanks so much you so ROCK!  email [email protected]

I sent a Sony KP51WT520, but it is the same chassis as the KP46WT520.

Larry, I received the service manual and I thank you.  Work is telling me that the "G" board is fine.  He doesn't want me to remove any more boards and wants to come to my home to look at it.  Can you tell me if it's not the "G" board which board it would be?  I don't want him making my problem worse.  My faith is not that high in him.....

Larry, never mind.  You did say earlier it could be the "D" board.  My bad, I am just devestated over my tv. 

The old 9 blink 46WT520 problem.  There are 2 diodes on the G board causing this. I don't have the referance numbers but you can use standard diodes.  I'll look them up today and post later. 

MOtvGuy, that would be wonderful.  Thank you.....

MOtvGuy, we have checked diodes D6301 and D6116, they test fine. 

Did you disconnect one end of the diodes and check both ways of the diode at high resistance? One way should check and the other very very high resistance.

I have the same model that started doing the same thing (9 blinks) on Sunday. Hope to change the diodes and fix it when I find what diodes will work in place of the originals.

Thanks,

Mark 

Mark55, stay posted I am sure this will help.

Mrk55, The D6301 part number is 6-500-567-21, and the D6116 part number is 8-719-081-97 and are available at http://www.partstore.com or a local Sony parts distributor should have these common diodes  Good Luck and let us know if this helps you out.

Larry, both diodes tested with high freguency using a Fluke 73 III.  I am told that they don't need to be removed to test????

I understand what your saying but just for kicks, test them the way i suggested.  I dont know how many times my meter said the diodes were good but then it turns out they were not.

Hi Larry,

Thanks for the info, but the D116 comes up as not available from Parts store.

 I did put the MMDL914T1 in a Mouser part number search and came up with a match. Mousers # is 863-MMDL914T1

Thanks,

Mark 

Larry, has any one else found a damaged componet on the "G" board? or any high current output on the same board? 

Sure lots of things go wrong on that board but the diodes are common. i forgot about those, thanks to MOtvGUY I remembered.

Larry, my technician wants to know.  Has any one else found a damaged componet on the "G" board? or any high current output on the same board? 

We are going to change out those 2 diodes and see if it works.  I'll take the board home tonight and plug it in.  Thanks to all.....

Thanks Mark I will update my file for that.

tmortz  According to my records we have found in the past IC6100,Q6111,Q6107, and D6118 all bad at differant times and on differant repairs.

Thank you Larry, Raul has changed out the 2 diodes and I will post later today or in the morning if it worked. 

Great. Our post here are strickly on the basis as these problems have happened in the past and it is always a possibility that your set has a differant problem. Thanks for keeping us informed.

Larry, thanks for the disclaimer.  We both feel that changing out the 2 diodes is way too easy to fix the problem so we fully expect more issues.

I just think it is great that you give your time doing this (I hope that this is your job and you get paid).

I took my G board out tonight and reflowed the solder on the 2 diodes in question even though they looked good, replaced the board and lo and behold the tv works again!!!

Thanks,

Mark 

Don't check the diodes, change them.

OMG! It worked.  Larry, I hope it is not just teasing me.  I keep turning it off and on again and it still works.  I thank you so much and everyone else that helped.  Terry