Sony XBR-52LX900 BL_ERR

[Diah]

cocktails strips

take clear photo on each strips front and end... will tell you how they are cocktails

[Nicktronic]

Look over all the solder joints, some of them don't look too great, add a little solder to those that look suspect, careful not to bridge anything, search images bad solder joints if needed, it's something that should be done early in troubleshooting becuz sometimes it IS just a bad solder or two.

What area did you notice the bad joints in?

[nomoresonys]

You have it in front of you so you can see it best, images of bad joints there: https://www.google.com/search?client...h=541&dpr=1.09

[Nicktronic]

cocktails strips

take clear photo on each strips front and end... will tell you how they are cocktails

Is this what you want to see??

[Diah]

yours photo , show the other end of the strips..
it show you have only 2 lines - * ... so where are the return line which it will go to the sockets??

try draw yours BL strips on paper and how the socket connected... then you will be sure that the circuit are closed not remain open

[Diah]

no need any more photo i found you upload before here & here so you have 2 channel each have 2 strips together... just be sure the 2 strips at the end of them connected like that
+ of channel socket go to + first strips. , - of first strips go to + second strips , - of second strips go to - of the channel socket

[Nicktronic]

no need any more photo i found you upload before here & here so you have 2 channel each have 2 strips together... just be sure the 2 strips at the end of them connected like that
+ of channel socket go to + first strips. , - of first strips go to + second strips , - of second strips go to - of the channel socket

Yeah, that's how they are wired

[Diah]

Yeah, that's how they are wired

then they are fine if you tested each on zener and LED....
you wrote at post #17 you have 6 red blinking... iits really 6 or it was typo???

[Nicktronic]

No, really 6.

[Diah]

No, really 6.

check after yours IC data sheet then compare

[Nicktronic]

Compare signals you mean?

[Nicktronic]

Here is the datasheet for IC6501, it's the PFC controller, but the PFC circuit works. Does it also limit current for the backlights??

[Nicktronic]

Look over all the solder joints, some of them don't look too great, add a little solder to those that look suspect, careful not to bridge anything, search images bad solder joints if needed, it's something that should be done early in troubleshooting becuz sometimes it IS just a bad solder or two.

Looked over all the solder joints, they all look good to me.

[Diah]

slide out the wire of BL_ON from the socket.on PSU .. its pin on the socket connect it to T-CON _12V_ON which you have 3.3V when tv start.... see if the BL will come on

[Davi.p]

How do you measure the led output voltage? Must be measured ex. from Out1+ to Out1-.. From what i can read the schematics there is an high power boost for the + outputs that it is supposed to be maybe near the 350v caps voltage, then another less power booster for the negative outputs, maybe a power charge pump, it has also 350v caps on it with the + on GND, so since each channel is near 700v, strips are in series of 2, then each strip is supposed to have near 350v.... i think you must inspect both positive stage and negative stage power components for short.. let me watch later which ones.. maybe its only turning the positive stage..

PS: that are... D6853/6, Q6850, Q6854, R6933, R6939, R6864, D6850, D6852, C6858

[Diah]

How do you measure the led output voltage? Must be measured ex. from Out1+ to Out1-.. From what i can read the schematics there is an high power boost for the + outputs that it is supposed to be maybe near the 350v caps voltage, then another less power booster for the negative outputs, maybe a power charge pump, it has also 350v caps on it with the + on GND, so since each channel is near 700v, strips are in series of 2, then each strip is supposed to have near 350v.... i think you must inspect both positive stage and negative stage power components for short.. let me watch later which ones.. maybe its only turning the positive stage..

PS: that are... D6853/6, Q6850, Q6854, R6933, R6939, R6864, D6850, D6852, C6858

what the hell you are talking..... you shared here post #7 and post #10... then nothings.... what i drive the owner over you jump with your silly kids.... however you are every day here and join other threats....
when you will stop this acting ????
do you know why i ask him to do what i asked... if you clever enough explain. the porpoise of it.???

when we will put end of this Admin... ???

[Nicktronic]

How do you measure the led output voltage? Must be measured ex. from Out1+ to Out1-.. From what i can read the schematics there is an high power boost for the + outputs that it is supposed to be maybe near the 350v caps voltage, then another less power booster for the negative outputs, maybe a power charge pump, it has also 350v caps on it with the + on GND, so since each channel is near 700v, strips are in series of 2, then each strip is supposed to have near 350v.... i think you must inspect both positive stage and negative stage power components for short.. let me watch later which ones.. maybe its only turning the positive stage..

PS: that are... D6853/6, Q6850, Q6854, R6933, R6939, R6864, D6850, D6852, C6858

How do you measure the led output voltage? Must be measured ex. from Out1+ to Out1-.. From what i can read the schematics there is an high power boost for the + outputs that it is supposed to be maybe near the 350v caps voltage, then another less power booster for the negative outputs, maybe a power charge pump, it has also 350v caps on it with the + on GND, so since each channel is near 700v, strips are in series of 2, then each strip is supposed to have near 350v.... i think you must inspect both positive stage and negative stage power components for short.. let me watch later which ones.. maybe its only turning the positive stage..

PS: that are... D6853/6, Q6850, Q6854, R6933, R6939, R6864, D6850, D6852, C6858

Looks like I have two bad MOSFETS (Q6850 and Q6854). One was working but now is suspect. They are Sanyo K4096 (datasheet attached). I've ordered replacements. Will update when received and installed.

Sorry Diah, I missed your post Share your ideas and successes!! I will see what happens after I replace the FETs.

[Davi.p]

Can i know how do you measure them? Usually is enough in diode mode every combination of pins, when mounted no one must show a drop near zero volt.

[nomoresonys]

Looked over all the solder joints, they all look good to me.

Not so sure about that, it can be hard to tell from pictures but at least a couple of those solders on those transistors look a bit cracked, I would touch up any joints that look different than a good joint, it's pretty simple: https://www.google.com/search?client...h=541&dpr=1.09

[nomoresonys]

https://www.google.com/search?client...h=541&dpr=1.09