Sony KDL50EX645 Six Blink

**ljintexas** · 05-16-2015, 12:37 PM

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** · 05-16-2015, 12:43 PM

Better Picture of SMPS

**Hamie** · 05-16-2015, 01:28 PM

Is your TV connected to the Internet?

**ljintexas** · 05-16-2015, 01:43 PM

Not at the moment.

**ljintexas** · 05-16-2015, 01:44 PM

It has no backlight..no display

**ljintexas** · 05-16-2015, 01:48 PM

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

**ljintexas** · 05-16-2015, 01:50 PM

I have the file from Sony support

**Hamie** · 05-16-2015, 02:09 PM

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** · 05-16-2015, 02:40 PM

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** · 05-16-2015, 02:44 PM

info came from my local Sony centre.

**ljintexas** · 05-17-2015, 05:16 AM

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** · 05-17-2015, 05:37 AM

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** · 05-17-2015, 06:24 AM

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** · 05-17-2015, 07:00 AM

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** · 05-17-2015, 07:23 AM

I verified that I have 3.3V SB, 3.3V @ POWER_ON, 12V on the two pins labeled REG12V, and [email protected]
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** · 05-17-2015, 07:25 AM

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** · 05-17-2015, 02:17 PM

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

**nicholas1110** · 05-17-2015, 02:18 PM

Also it read open when tested fyi

**budm** · 05-17-2015, 10:31 PM

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** · 05-25-2015, 09:11 AM

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

05-16-2015, 01:28 PM	#3
Hamie Badcaps Veteran Join Date: Apr 2014 City & State: Blighty My Country: UK I'm a: Forum Junkie Posts: 1,368	Re: Sony KDL50EX645 Six Blink Is your TV connected to the Internet?

05-16-2015, 01:43 PM	#4
ljintexas LJinTexas Join Date: Jan 2015 City & State: San Antonio, Tx My Country: USA Line Voltage: 120/240 I'm a: Hobbyist Tech Posts: 555	Re: Sony KDL50EX645 Six Blink Not at the moment.

05-16-2015, 01:44 PM	#5
ljintexas LJinTexas Join Date: Jan 2015 City & State: San Antonio, Tx My Country: USA Line Voltage: 120/240 I'm a: Hobbyist Tech Posts: 555	Re: Sony KDL50EX645 Six Blink It has no backlight..no display

05-16-2015, 01:48 PM	#6
ljintexas LJinTexas Join Date: Jan 2015 City & State: San Antonio, Tx My Country: USA Line Voltage: 120/240 I'm a: Hobbyist Tech Posts: 555	Re: Sony KDL50EX645 Six Blink From what I understand, i cannot do the firmware update unless the display is working.

05-16-2015, 01:50 PM	#7
ljintexas LJinTexas Join Date: Jan 2015 City & State: San Antonio, Tx My Country: USA Line Voltage: 120/240 I'm a: Hobbyist Tech Posts: 555	Re: Sony KDL50EX645 Six Blink I have the file from Sony support

05-16-2015, 02:09 PM	#8
Hamie Badcaps Veteran Join Date: Apr 2014 City & State: Blighty My Country: UK I'm a: Forum Junkie Posts: 1,368	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.

05-16-2015, 02:40 PM	#9
ljintexas LJinTexas Join Date: Jan 2015 City & State: San Antonio, Tx My Country: USA Line Voltage: 120/240 I'm a: Hobbyist Tech Posts: 555	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?

05-16-2015, 02:44 PM	#10
Hamie Badcaps Veteran Join Date: Apr 2014 City & State: Blighty My Country: UK I'm a: Forum Junkie Posts: 1,368	Re: Sony KDL50EX645 Six Blink info came from my local Sony centre.

05-17-2015, 05:16 AM	#11
ljintexas LJinTexas Join Date: Jan 2015 City & State: San Antonio, Tx My Country: USA Line Voltage: 120/240 I'm a: Hobbyist Tech Posts: 555	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.

05-17-2015, 05:37 AM	#12
tom66 EVs Rule Join Date: Apr 2011 City & State: Leeds My Country: UK Line Voltage: 230Vac 50Hz I'm a: Professional Tech Posts: 32,373	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. __________________ Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead! Free service manuals: http://www.toms-service-manuals.com/ -- 72 LED/LCD TVs, 5 monitors, 28 plasma TVs, and 2 AVR 6.1 amplifiers fixed! -- I repair Pioneer 9G Plasma Main Boards & KRP-M01 Media Receivers (PM me for info) 2 Pioneer KURO 9G, 12 Panasonic LCD/Plasma, 1 Sony LCD, 1 NEC Plasma, 2 Yamaha HTS, 5 Sharp LCDs, 5 Toshiba LCDs, 7 Philips Plasma/LCD, 1 Hitachi Plasma, 11 LG LCD/Plasma, 18 Samsung LED/LCD/Plasma, 1 Thomson Plasma, 1 Atec LCD, 1 Hanspree LCD, 1 Xerox LCD, 1 Harwa LCD, 2 Proview LCD, 2 Hyundai LCD, 1 "Onn" LCD, 1 Grundig LCD, 1 Dell LCD, 1 iiyama LCD, 1 Acer LED, 1 Logik LCD, 1 Baird (China) LCD, 6 Bush LCDs, 22 Vestel LCDs (Best->Worst)

05-17-2015, 06:24 AM	#13
ljintexas LJinTexas Join Date: Jan 2015 City & State: San Antonio, Tx My Country: USA Line Voltage: 120/240 I'm a: Hobbyist Tech Posts: 555	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!

05-17-2015, 07:00 AM	#14
nicholas1110 Senior Member Join Date: Aug 2012 City & State: minnesota My Country: usa I'm a: Knowledge Seeker Posts: 111	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.

05-17-2015, 07:25 AM	#16
ljintexas LJinTexas Join Date: Jan 2015 City & State: San Antonio, Tx My Country: USA Line Voltage: 120/240 I'm a: Hobbyist Tech Posts: 555	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.

05-17-2015, 02:17 PM	#17
nicholas1110 Senior Member Join Date: Aug 2012 City & State: minnesota My Country: usa I'm a: Knowledge Seeker Posts: 111	Re: Sony KDL50EX645 Six Blink Hi, just looked through my notes. I replaced smd resistor r602d on the backside of the power su

05-17-2015, 02:18 PM	#18
nicholas1110 Senior Member Join Date: Aug 2012 City & State: minnesota My Country: usa I'm a: Knowledge Seeker Posts: 111	Re: Sony KDL50EX645 Six Blink Also it read open when tested fyi

05-25-2015, 09:11 AM	#20
ljintexas LJinTexas Join Date: Jan 2015 City & State: San Antonio, Tx My Country: USA Line Voltage: 120/240 I'm a: Hobbyist Tech Posts: 555	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 Last edited by ljintexas; 05-25-2015 at 09:12 AM..

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