Sceptre X505BV-FMDR

[Johnmoreno72]

Re: Sceptre X505BV-FMDR

Same TV (Sceptre X505BV), except my unit won't turn on at all. There was a red LED that stayed Lit as long as the TV was plugged in, but it went away (it started dying a few weeks before the TV went completely dead. It would go away for a few hours but it would come back if I unplugged the TV for a few minutes. Now it's completely dead)
Based on your posts, I checked the power supply board. All the DC voltages seem to be there except for the BL/ON line ( I checked it as AC and DC), which reads zero (I have no way of turning the TV ON.)
Is this voltage generated by the power supply board or the main board? There are no obvious bad capacitors, so I am going to change either the PS board or the main board; my gut tells me that the PS board is fine, but then again I've never repaired a TV before.
Thanks guys!

[BadGoo]

Re: Sceptre X505BV-FMDR

Same TV (Sceptre X505BV), except my unit won't turn on at all. There was a red LED that stayed Lit as long as the TV was plugged in, but it went away (it started dying a few weeks before the TV went completely dead. It would go away for a few hours but it would come back if I unplugged the TV for a few minutes. Now it's completely dead)
Based on your posts, I checked the power supply board. All the DC voltages seem to be there except for the BL/ON line ( I checked it as AC and DC), which reads zero (I have no way of turning the TV ON.)
Is this voltage generated by the power supply board or the main board? There are no obvious bad capacitors, so I am going to change either the PS board or the main board; my gut tells me that the PS board is fine, but then again I've never repaired a TV before.
Thanks guys!

Sounds like a bad PS. When you say you have no way of turning the TV on, what do you mean? If you can turn it on, flash a light onto the screen and see if you can see an image (static etc)

[budm]

Re: Sceptre X505BV-FMDR

BL-ON and DIM controls lines are generated by the main board, since you have LED on that means the standby power supply is working.
Do you have PS-ON?

[Johnmoreno72]

Re: Sceptre X505BV-FMDR

Hi guys, Thank you so much for your help.
To clarify, this is what I have: The red LED that should turn on when the TV is plugged to the wall is always off (there was a time weeks ago when I could make it come back ON by unplugging the TV for a few minutes but that's no longer the case) This is the same LED that should turn blue when I turn the TV ON, but that doesn't happen either (the TV does not turn on at all. Flashlight test also fails)

As far as voltage levels on the PS board:
+5V: 4.99V
+12V: 12.34V
+24V: 23.80V
PS/ON: 4.42V
+5VSB: 4.99V
ADJ: 4.92V
BL/ON: 0.06V (both with respect to DC GND and Chassis GND)

There's also a small connector, called connector 10 (see pic, red/black wires) that reads -0.66VDC (with respect to each other, NOT with respect to CH GND or DC GND

[budm]

Re: Sceptre X505BV-FMDR

"BL/ON: 0.06V (both with respect to DC GND and Chassis GND)"
You are not getting the BL-ON signal to turn on the backlights circuit, it is generated by the main board.

[Johnmoreno72]

Re: Sceptre X505BV-FMDR

Thanks Budm, but would the absence of the BL/ON signal also cause the power indicator to not lit? (I get no red or blue Pete indicator light, so no indication that the TV is ON or even plugged to the wall. No image by shining a flashlight either when I try to turn it ON -though I doubt it's turning ON)

[budm]

Re: Sceptre X505BV-FMDR

What it means is that you have main board problem.

[Johnmoreno72]

Re: Sceptre X505BV-FMDR

Fixed!
Thanks BadGoo and special thanks to Budm for your advice and excellent troubleshooting guides.
The main board was the culprit. I replaced it and I'm back in business.. There are no visible bad components, and I didn't want to spend too much time on this so I replaced the whole board - which was cheap enough. I'm glad I found this site. Thanks again.
John

[budm]

Re: Sceptre X505BV-FMDR

Thanks for the follow-up.

[AndyGold]

Re: Sceptre X505BV-FMDR

Hello all! Excellent forum here, glad I found my way to it.

My Sceptre X505BV-FMQR died last week, going completely black while I was watching it. It still had sound so I figured there was hope.

I found the flashlight trick here and it showed my picture was still active. I'm not much on using a multimeter (tho I have one around here somewhere) and a PS board was just $26 on ebay so I ordered one. I has very happy to find a local supplier ("TV chop shop", shows you how the world has changed ) and had the board the next day.

Didn't fix the issue, so I ordered a main board for $45. Didn't help either. Still, both boards are easily swapped out AND the usual suspects according to what I've found online. The supplier has a great return policy, so I wasn't out anything but the return postage at that point. Still, I think I'll keep them as I love having backup parts around.

Somewhere (this thread maybe?) someone mentioned that a single LED going out could be the culprit. I opened up the set from the front and found this to be true. The backlighting is ten strips in five rows, each row having a DLED 505SJ5X14 0001.A-1 / 3.08.500514D-L that has an A-2/D-R connected to it. It was easy to find one dead right side strip.

I basically jumped a strip at the left side connector, then turned on the set. (I found that you have to fire up the set each time to test each strip.) Nothing happened until I jumped the second row down, at which point the remaining strips lit up. Yah! I then jumped the midpoint of that strip and found the right side was still working.

So now I need a replacement strip (or more, to have handy). I've emailed my supplier, and hopefully he's got some as I can't find either of those two part numbers online anywhere.

So, I thought I'd share with you what I found AND see if any of you have a source for LED strips online somewhere, in case my local supplier doesn't have any.

If that doesn't pan out I may just try jumping individual LED's and live with one being out. Still, I'd rather have a few of them lying around for the future...

[BadGoo]

Re: Sceptre X505BV-FMDR

Hello all! Excellent forum here, glad I found my way to it.

My Sceptre X505BV-FMQR died last week, going completely black while I was watching it. It still had sound so I figured there was hope.

I found the flashlight trick here and it showed my picture was still active. I'm not much on using a multimeter (tho I have one around here somewhere) and a PS board was just $26 on ebay so I ordered one. I has very happy to find a local supplier ("TV chop shop", shows you how the world has changed ) and had the board the next day.

Didn't fix the issue, so I ordered a main board for $45. Didn't help either. Still, both boards are easily swapped out AND the usual suspects according to what I've found online. The supplier has a great return policy, so I wasn't out anything but the return postage at that point. Still, I think I'll keep them as I love having backup parts around.

Somewhere (this thread maybe?) someone mentioned that a single LED going out could be the culprit. I opened up the set from the front and found this to be true. The backlighting is ten strips in five rows, each row having a DLED 505SJ5X14 0001.A-1 / 3.08.500514D-L that has an A-2/D-R connected to it. It was easy to find one dead right side strip.

I basically jumped a strip at the left side connector, then turned on the set. (I found that you have to fire up the set each time to test each strip.) Nothing happened until I jumped the second row down, at which point the remaining strips lit up. Yah! I then jumped the midpoint of that strip and found the right side was still working.

So now I need a replacement strip (or more, to have handy). I've emailed my supplier, and hopefully he's got some as I can't find either of those two part numbers online anywhere.

So, I thought I'd share with you what I found AND see if any of you have a source for LED strips online somewhere, in case my local supplier doesn't have any.

If that doesn't pan out I may just try jumping individual LED's and live with one being out. Still, I'd rather have a few of them lying around for the future...

Same issue. I actually sourced similar SMD 2835 LEDs from China as I couldn't find the strip anywhere. I even contacted a few suppliers online that dealt strictly with back light strips. I put the new LEDs on the strip and they work fine except now I have an issue with the LCD not coming on which it did before. You can actually just test individual LEDs with a multi-meter. On the strip, there are small copper circles that I used to test each one.

It's been in storage for awhile as I recently moved so I haven't had any updates. I turned it on the other day for the heck of it and it turned on like new but then I turned it off and back on and again I'm stuck with no LCD again but the back lights work fine.

I'll be digging back into it next week. I believe I have another thread here which I need to follow up on.

[AndyGold]

Re: Sceptre X505BV-FMDR

Well, my Sceptre is back in action, and more importantly I think I can keep it that way as long as the panel itself holds out. (forgive the smilies, I don't usually use them but there's a fun selection here so I'm going to play with them...)

So, I'll outline what I should have done:

Since it went black but the sound and picture continued to function the backlighting LED's were the logical cause.

There are a couple of dozen very small Philips screws around the outside edge on the back of the set that hold the front bezel in place. Removing those allows you to unsnap the bezel (as it locks in place without the screws) and expose the plastic brackets that hold the frosted white plastic diffusor panels in place. Mine has two thin flexible sheets on top of a thicker, rigid sheet. The LCD panel just sits on top of those three sheets, and is held in place by the bezel.

I placed the set on its back along a wall, and flipped up the LCD panel (which luckily has flexible connectors). I then removed the screws along the top and side brackets so I could remove the white panels and expose the LED's. The LED strips are two pieces with seven LED's each, with exposed connectors at the lead end and the middle. I jumped the lead end connectors of one strip and turned on the set. I waited a count of five and nothing happened. Working my way up the strips I found one that, when jumped, allowed the rest of them to turn on. When my eyesight returned I put on some sunglasses and then jumped the middle connector on that strip. Only the end strip failed to light up, so the bad LED was on that strip.

The strips have lenses permanently attached so you can't actually see the LED's without breaking the three tiny legs each lens has. Still, this is better than removing the white backing paper that's glued/taped down over the strips. Snap off a lens and look at the LED. My dead one had a small black dot in the center of it. You can also test continuity, or just jump the LED and try turning the set on again, as you prefer. Continue until you find the dead one.

I had ordered some "Cool White 3825" led's found here:
https://www.superbrightleds.com/more...led/1843/4456/
They're 49 cents apiece with $3 shipping and they arrived promptly in two days as they ship from Missouri. I could have gotten a lot more a lot cheaper but the cheaper ones all seem to come directly from China and gave me estimated delivery dates a month out.

I just literally scraped the plastic body of the dead LED off of the strip with a screwdriver. It came off easily, leaving two metal contacts with a small strip of plastic between them, perfect for soldering a new one onto, which I did. I had very fine electronic rosin core solder from other projects, but had to take a grinder to the tip of my soldering wand to get it fine enough for this, as it takes next to nothing solder-wise.

A few drops of silicone on the broken legs restored the lenses, which I placed with the LED's lit (use sunglasses) to make sure they were all centered correctly.

I'm not sure how fussy I had to be, as the three diffusor sheets really blend the light, but the replacement LED isn't EXACTLY the same color as the others and I wanted to do all I could to help it all blend. As it is with the diffusor sheets in place my friends couldn't see any indicator of which LED it was, so I'm happy.

Put the sheets back after the silicone dries, replace the screws, and fire up the TV...

Warning: The LED's are VERY small. I have big, fat fingers and only moderate experience soldering. I sneezed and still haven't found that LED. If I could do this anyone can... all it takes is a small Philips screwdriver, a tube of silicone, some fine electronic solder and a wand with a very fine tip, and about $3.50 in parts.

[budm]

Re: Sceptre X505BV-FMDR

You may want to turn down the backlights level to help extend the LED life. The one in the link has continuous forward current of only 60mA which is low for backlights LED, they are usually over 100mA range (https://www.badcaps.net/forum/showpo...4&postcount=95). So do not drive the backlights on the Max SETTING.

[thedude10]

Re: Sceptre X505BV-FMDR

Thanks guys for all of the information! I was able to change out a PSU for 35 smackers! I had no voltage reading on any of the terminals. David

[bigdubbe]

Re: Sceptre X505BV-FMDR

"BL/ON: 0.06V (both with respect to DC GND and Chassis GND)"
You are not getting the BL-ON signal to turn on the backlights circuit, it is generated by the main board.

Anyone know what the voltage should be?

[budm]

Re: Sceptre X505BV-FMDR

>2.5Vdc = on
<1Vdc = off

[Fanatic]

Re: Sceptre X505BV-FMDR

Hello,
Sorry to hijack this thread - mods feel free to move it.

I have the same TV Sceptre X505BV-FMDR. Picture went out one day while watching. I have sound and I can see the picture if I shine a flashlight on it.

I checked the voltages on the PS. All look good with the exception of Con3. I'm not getting the 24V. Any ideas?

The pic is borrowed from an earlier post, but I have the same board.

[TVRepairNoobie]

Re: Sceptre X505BV-FMDR

Thanks to this forum and youtube. I was able to get a co-worker's Sceptre X505BV-FMDR working again. All it took here was one failed LED to cripple the backlight.

[thebrettonian]

Re: Sceptre X505BV-FMDR

Im having a similiar issue. Only I have no voltage at connector 10. Main Board???

[esinclair]

Re: Sceptre X505BV-FMDR

I'd like to thank you all for your comments and so forth.

My backlight failed, just like the others on my Sceptre X505BV-FMDR. Flashlight trick shows the LCD is working.

I'm guessing I have a bad backlight LED since I have an BL/ON of 4.6v

So since my BL/ON signal from the main board is on, should I be able to test for the drive voltage to the LED boards.

See the attached photo. I have marked it as to my guess as to which output is going to the LED's. If so, approximately what voltage should I expect here? So I would expect since the BL/ON is HIGH, I should be seeing a voltage here higher than the "-.6" I'm seeing. Notice, my voltage is negative if i put my red probe on "+" and black on "-".

So if BL/ON is high, and I'm not getting voltage over on the red and black wires, should I look to the power supply, or dig deeper into the chassis and start looking at LED's?

Thanks in advance for your replies.