Sony KDL50EX645 Six Blink

[ljintexas]

This set just quit working. No Flash, no noise, no warning signs. Three years old. Here are pictures of whole set and each respective board. Green LED will come on with both remote and push button, but after 30 seconds goes off and Red LED goes back to six blinks. No back light from what I can see. Any suggestions on points to test voltage or otherwise are greatly appreciated.

[ljintexas]

Re: Sony KDL50EX645 Six Blink

Better Picture of SMPS

[Hamie]

Re: Sony KDL50EX645 Six Blink

Is your TV connected to the Internet?

[ljintexas]

Re: Sony KDL50EX645 Six Blink

Not at the moment.

[ljintexas]

Re: Sony KDL50EX645 Six Blink

It has no backlight..no display

[ljintexas]

Re: Sony KDL50EX645 Six Blink

From what I understand, i cannot do the firmware update unless the display is working.

[ljintexas]

Re: Sony KDL50EX645 Six Blink

I have the file from Sony support

[Hamie]

Re: Sony KDL50EX645 Six Blink

Yeah it, i know that sony updated some of their range recently and it corrupted the TV. But this wouldn't have applied to you if it wasn't connected to the net.

[ljintexas]

Re: Sony KDL50EX645 Six Blink

It may have been connected. I bought it as a dead set. Customer had called Sony and they told him it sounded like the SMPS..where is info about the possible corruption?

[Hamie]

Re: Sony KDL50EX645 Six Blink

info came from my local Sony centre.

[ljintexas]

Re: Sony KDL50EX645 Six Blink

Reset code using 10 sec on..unplug for 15 sec..plug in and turn on using PB switch..Solid green then three green blinks for about 30 seconds...then back to six blinks. Measured pins labeled UNREG 24 Volts leading to inverter when light is green..only getting 1.59 volts. Tried this with inverter plugged in and unplugged..same result so I am reasonably sure the inverter is not dragging it down. I read on a forum that there is a known design defect in the 24 volt transformer section of this board.

[tom66]

Re: Sony KDL50EX645 Six Blink

Did you verify the main board is sending a power on command? The 24V will measure low if the main board does not send that command.

[ljintexas]

Re: Sony KDL50EX645 Six Blink

I did not do that Tom. Let me see if I can figure out which terminal gets the "on" command. I will check it!

Thanks!

[nicholas1110]

Re: Sony KDL50EX645 Six Blink

Hello,

I had one of these come through my shop recently. The issue was a smd resistor on the back side of the power supply. I'll look through my notes later today to find the exact location. Otherwise there is a repair service on eBay for this issue as well.

[ljintexas]

Re: Sony KDL50EX645 Six Blink

I verified that I have 3.3V SB, 3.3V @ POWER_ON, 12V on the two pins labeled REG12V, and 3V@T-CON-ON
This is for the 20 sec or so before it defaults back to six blinks with green LED on. Then all goes to 0V.

[ljintexas]

Re: Sony KDL50EX645 Six Blink

Thank You nicholas! Yes I saw it they say they burn it in an actual set for 12hours after repairs..Includes shipping both ways for a mere $85. They say they also know of a design defect in the board and remedy it.

[nicholas1110]

Re: Sony KDL50EX645 Six Blink

Hi, just looked through my notes. I replaced smd resistor r602d on the backside of the power su

[nicholas1110]

Re: Sony KDL50EX645 Six Blink

Also it read open when tested fyi

[budm]

Re: Sony KDL50EX645 Six Blink

r602d is part of the series sensing resistors (A~D, sensing the Boosted PFC Voltage(>360vdc)), very high resistance resistors feeding IC601.
http://assets.shopjimmy.com/media/ca...-11-bottom.jpg

http://www.shopjimmy.com/sony-1-895-...e50-board.htm#

[ljintexas]

Re: Sony KDL50EX645 Six Blink

Just got repaired smps back from Sony service agent. They charged me $85 including Priority Mail return shipping. After close inspection here is what I found that was done:

Replaced R602 A-D
Replaced IC601
Replaced IC303
Replaced D305
Replaced ZD306

Works like a champ.

Thanks
LJ