Sony XBR-52HX909 No Power -Red LED blinks 5 times

[DigitalStone]

Have a XBR-52HX909. Will power on for a few seconds then shut itself off. White Sony LED logo will come on at bottom of tv. Click then off. Will blink 5 times on front Red Led then stop for a minute then blink 5 times again.

No Menu will come up ( No OSD). Nothing when switching inputs.
Screen looks like it doesn't even start up.

Have tried leaving unplugged overnight. Does the same thing next morning.

Did visual inspection on power board ( Sony 1-474-239-11 G6 ) couldn't see any problems.

Cant find service manual for the unit. Spend all morning googling different #'s and phrases but haven't turned up any ideas on the cause. Thought I would ask if anyone knew the problem off the bat or what the 5 blinking LED's meant.

Really hoping I can fix it.

Appreciate any advice.

[tom66]

Re: Sony XBR-52HX909 No Power -Red LED blinks 5 times

In a dark room, does the screen appear to glow, or flicker when first powered up?

[DigitalStone]

Re: Sony XBR-52HX909 No Power -Red LED blinks 5 times

Completely Black. Not a hint of Flicker.
Thinking it might be the inverter board. (RUNTK4332TP)

Have to dig out the meter and take some measurements.

[DigitalStone]

Re: Sony XBR-52HX909 No Power -Red LED blinks 5 times

Pic of Powerboard:

[tom66]

Re: Sony XBR-52HX909 No Power -Red LED blinks 5 times

Please avoid adding pictures to posts in line, instead use the manage attachments feature in future.
I need a picture of the chassis to determine what design this uses (24V or high voltage inverter.)

[budm]

Re: Sony XBR-52HX909 No Power -Red LED blinks 5 times

This TV uses LED backlights, still cannot find the error codes for this TV yet, still researching. Try disconnected the CN6752 which feeds the LED backlights assemblies and see what happen.
Please take the DC voltage readings on CN6151, CN6152 also.

[splitcrete]

Re: Sony XBR-52HX909 No Power -Red LED blinks 5 times

Check the T_CON fuse... five flashes is a t-com problem.

[DigitalStone]

Re: Sony XBR-52HX909 No Power -Red LED blinks 5 times

Disconnected the CN6752 and got the same pwr on for a bit then shuts off with the 5 red blinks. Unplugged the CN6151 and got the same thing.

Took readings on the CN6161 and got:
pins 1-3 = 12v
Pins 4,5 & 6 = 3.4v

On the CN6152
pin:
11 = 3.3
10 = 12.6
9 = 12.5
8 = 12.5
7 = -1.5
6 = -1.5
5 = 3.8
4 = 16.6
3 = 3.3
2 = 3.3
1 = 3.3

So guessing there is something off with the t-com?

Going to check the fuse on the t-con board. Will post back with results.

[DigitalStone]

Re: Sony XBR-52HX909 No Power -Red LED blinks 5 times

Count 5 fuses labeled SOC72v T 3. (White)
Didint see anything labeled F1. only 2 had an f ( F1000 and F1001 )

All give readings that they are still good. Unless I missed one... Bit new at this. These things are Sooooo. Tiny.

Link to a zoomable pic. T-CON

Cannot see any sign of damage to the board. No burning or smelling burnt.

[splitcrete]

Re: Sony XBR-52HX909 No Power -Red LED blinks 5 times

I soldered a fine piece of wire on top of my fuses and my screen came right on and blinking light stopped. I shut it down and got two new fuses and soldered them on. TV works great now. We had a transformer in the neighborhood that surged before it burned out.Your pictures are not the best quality to work with. f-1000 & f-1001 are the fuses to check. Dont trust there reading unless at least one end is off circuit board..

[DigitalStone]

Re: Sony XBR-52HX909 No Power -Red LED blinks 5 times

Where can I get a suitable fuse replacement? Never ordered a smd fuse from Digikey before.

[tom66]

Re: Sony XBR-52HX909 No Power -Red LED blinks 5 times

Testing it first would be a good idea. Is it actually failed?

[newworlds88]

Re: Sony XBR-52HX909 No Power -Red LED blinks 5 times

Hi; regarding your power board. Do you have any additional pics with the board assembled with all connections. For example: CN6752 so I can view the cable connection there? Please advise. Thanks and be well.

[nomoresonys]

Re: Sony XBR-52HX909 No Power -Red LED blinks 5 times

Hi; regarding your power board. Do you have any additional pics with the board assembled with all connections. For example: CN6752 so I can view the cable connection there? Please advise. Thanks and be well.

Always check date of last post, no post on this thread for 6 1/2 years.

[tvfixer007]

Re: Sony XBR-52HX909 No Power -Red LED blinks 5 times

Hi; regarding your power board. Do you have any additional pics with the board assembled with all connections. For example: CN6752 so I can view the cable connection there? Please advise. Thanks and be well.

Maybe we can start where OP left off? I came across this same TV with 5 blinks as well.

Checked t-con board fuses and they are okay. Checked voltages on the PSU and During power on phase before the LED blinks all voltages are normal, except for backlights only shows 1.5v during power on phase, and then it drops to 0v with and without the LED driver board connected.

Did a reflow on the mainboard. Thinking it's a power supply issue. Any other assistance would be grateful!

[nomoresonys]

Re: Sony XBR-52HX909 No Power -Red LED blinks 5 times

Test connector from mainboard to powerboard on powerboard side with all boards hooked up, test with tv plugged in but off then hit power, report both conditions here, give pin number, pin description/name and condition both off and when you hit power on. So we can see all the voltages and what they are doing.

[R_J]

Re: Sony XBR-52HX909 No Power -Red LED blinks 5 times

The led board supplies the LED_ON command, if it is not there the VLED_VCC will not be there. There is a fuse on the led driver board (PS7000)

[tvfixer007]

Re: Sony XBR-52HX909 No Power -Red LED blinks 5 times

Thanks for the replies.... here are the results. Seems the t-con isn't receiving voltage.

TV OFF readings

1.STBY3.3 3.342v
2.AC_OFF_DET 3.343
3.POWER_ON 0.002
4.AUDIO12V 0.055
5.AUDIO12V_GND 0.000
6.REG12V_GND 0.000
7.REG12V_GND 0.000
8.REG12V 0.055
9.REG12V 0.055
10. T-CON_VCC_12V 0.055
11.T-Con_ON 0.000

TV ON readings


1.STBY3.3 3.342v
2.AC_OFF_DET 3.343
3.POWER_ON 3.284
4.AUDIO12V 12.68
5.AUDIO12V_GND 0.000
6.REG12V_GND 0.000
7.REG12V_GND 0.000
8.REG12V 12.67
9.REG12V 12.67
10. T-CON_VCC_12V 12.67
11.T-Con_ON 0.000

[tvfixer007]

Re: Sony XBR-52HX909 No Power -Red LED blinks 5 times

The led board supplies the LED_ON command, if it is not there the VLED_VCC will not be there. There is a fuse on the led driver board (PS7000)

I checked the fuse on the LED board meter reads 000.1

Tested voltage across each end of fuse and meter reads 12.68

[nomoresonys]

Re: Sony XBR-52HX909 No Power -Red LED blinks 5 times

OK, just to verify, turn tv on, check tcon fuse, black probe to chassis ground red probe to each side, is there around 12 volts on each side, might be 0? Check it for continuity too.