Sony KDL-65W855C after backlight replacement

[Mikeyboy2007]

Hi guys i have done many of these KDL-65W855c models aswell as 805c, 850c etc. i replaced the backlights with new after 1 strip was testing dead so just replaced the full array from TVLEDBARZ, i put all the strips in and both sides of the tv are testing 173v per side but tv still gets a brief flash and then 6 red led blink.

anyone any idea whats going on ? im assuming its not a fault with the new strips.

i should also mention i have tried swapping both the PSU and AV board from another tv with same model.

[Mikeyboy2007]

ok guys i figured it out. there was bad solder joints underneath the PSU on the connectors. i gave them a reflow and some cleaning and they are now fully functioning. i order all my backlights from a well known store in the UK and not from china, too long to ship

[mmartell]

Six blink IS the backlight circuit though I'm sure you're aware of that...

I'd say the circuit isn't liking something about your new led strips.

[Mikeyboy2007]

I tried it with abother PSU and had the same result.

[zomi]

will bad backlights, one of the strips will not be right ..
I have had a bad set once..
So now I aways test them for a short while to see if they are all ok

also could be a bad connector

if the tv is open try swapping some out to see

But from experience I would say a faulty strip

[Mikeyboy2007]

I will pop the tv back open and check. But i did test both the left and right strings on LEDs from the back and both where 173v each

[Mikeyboy2007]

will bad backlights, one of the strips will not be right ..
I have had a bad set once..
So now I aways test them for a short while to see if they are all ok

also could be a bad connector

if the tv is open try swapping some out to see

But from experience I would say a faulty strip

i have checked each strip individually and as a string and from the PSU side. and they are all fine and hold a steady voltage, i also tested the psu while the tv was power on and backlights connected, even though the backlights do not light up the psu is outputting voltage to the wires and i am no longer getting a red flashing led, possibly becuase the panel is removed ?? any other ideas ? first time ive encountered this problem with these tvs

[zomi]

Only ever had one bad set from china out of 20 or so sets.

[Diah]

Sony KDL - W serie knowing issue always BGA on Main chip..
post photos of yours old and new strips.label / socket also test one LED unit with yours DM in Diode mode to know if there are zener diode build in reserve way

[EazyBone]

I did not have this exact TV, but yes it's BL circuit it says. It was NOT the backlights when I had it, even though I replaced them. Mine was the PSU for the driver. I would check and post the voltages coming out of it here, does BLerr pin have any voltage?

[Mikeyboy2007]

ok guys i figured it out. there was bad solder joints underneath the PSU on the connectors. i gave them a reflow and some cleaning and they are now fully functioning. i order all my backlights from a well known store in the UK and not from china, too long to ship

[EazyBone]

Aha! PSU it is. 6 blink not BLs again. Good work

[zomi]

the well known source will still be getting them from china, lol

Glad to here you got it sorted