Hkl-480201b hkl-500201b hkl-550201b psb repair

[budm]

Re: Hkl-480201b hkl-500201b hkl-550201b psb repair

See post #9.
Your board is EXACTLY the same as OP, correct?

[dalilama]

Re: Hkl-480201b hkl-500201b hkl-550201b psb repair

I have a 55 inch Sceptre with the same issue. Can you provide the diode values for D10 and D11?

Thanks!

Thanks to kevindinh I have the info. These are 5A 150 V Schottky diodes.

[dalilama]

Re: Hkl-480201b hkl-500201b hkl-550201b psb repair

Fixed a few of these all with the same fault. TV is dead.
Usually simple and easy to repair.

Check and replace D10 and D11 usually brings these back to life.

These power supplys are uses in loads of cheap sets 48" - 55"

2014 models to present day.

Want to thank you Hamie - D11 was the culprit. A $0.28 part later and the TV is back up and running. Replaced all the caps while I was at it. Hope I get another 5 years out of this!

[flos57]

Re: Hkl-480201b hkl-500201b hkl-550201b psb repair

Want to thank you Hamie - D11 was the culprit. A $0.28 part later and the TV is back up and running. Replaced all the caps while I was at it. Hope I get another 5 years out of this!

Hi, I have the same tv as you. Just wondering if you might direct me to where you ordered the $0.28 diodes for the repair. Thanks!

[jetadm123]

Re: Hkl-480201b hkl-500201b hkl-550201b psb repair

They are 150v 5A schottky diodes. This should work:

https://www.digikey.com/product-deta...GCT-ND/7359325

[flos57]

Re: Hkl-480201b hkl-500201b hkl-550201b psb repair

They are 150v 5A schottky diodes. This should work:

https://www.digikey.com/product-deta...GCT-ND/7359325

Thanks for the link. I grabbed some off ebay on an impulse buy. Hopefully they will work.
Edit: Decided to order from digikey since I know the parts will be quality.

[Duran]

Re: Hkl-480201b hkl-500201b hkl-550201b psb repair

Fixed a few of these all with the same fault. TV is dead.
Usually simple and easy to repair.

Check and replace D10 and D11 usually brings these back to life.

These power supplys are uses in loads of cheap sets 48" - 55"

2014 models to present day.

This fix worked for me on Sansui 50"LED with blinking power light.

Thanks a mill bro

[cheeky2]

Re: Hkl-480201b hkl-500201b hkl-550201b psb repair

Ooops posted in wrong thread!

[flos57]

Re: Hkl-480201b hkl-500201b hkl-550201b psb repair

This fix worked for my Sceptre 55" tv. Replaced the two diodes D10 and D11. Working like new.

Much appreciated!

[teegee]

Re: Hkl-480201b hkl-500201b hkl-550201b psb repair

Hello and a happy new year!
I've got the same "TV dead" problem, so I pulled out D10 and D11. Only one of them was dead (don't remember which one) but I replaced them both. I couldn't find the 5A/150V diode at my local shop so I put two 6A/1000V "Fast rectifier" diodes in.
Tv worked for 2 minutes and then turned off. D10 is dead again.

Instead of trying to find a matching diode, I'm going to assume the problem is somewhere else upstream. Any thoughts how to find the actual cause?

Cheers

[budm]

Re: Hkl-480201b hkl-500201b hkl-550201b psb repair

See post #25 for the correct type of diodes.

[teegee]

Re: Hkl-480201b hkl-500201b hkl-550201b psb repair

See post #25 for the correct type of diodes.

Do you think replacing them with completely over-speced diodes is a problem?

[budm]

Re: Hkl-480201b hkl-500201b hkl-550201b psb repair

They have to be schottky diodes in this application. What is the P/N of the so called 'fast rectifier' diode that you put in.
You can look up the spec of the original diode and also the one from the digikey and compare it to the 'Fast rectifier' you put in.

[teegee]

Re: Hkl-480201b hkl-500201b hkl-550201b psb repair

This guy:
https://pdf1.alldatasheet.com/datash...TSC/FR607.html

Forward voltage is almost double of the Schottky one. I'm going to order a bunch of SR515 from digikey but I'll have to sneak it into someone else's order to avoid the ridiculous $25 delivery fee

[budm]

Re: Hkl-480201b hkl-500201b hkl-550201b psb repair

https://www.electronics-notes.com/ar...parameters.php

https://cdn.badcaps-static.com/pdfs/...5e00050d46.pdf

[Sebas.ale.kw]

Re: Hkl-480201b hkl-500201b hkl-550201b psb repair

Does any of you have the scheme of this PSU? I have a hkl-550201 b version 2.0 that has ic U4 (which is at the bottom, next to the bridge rectifier) blown, and I can't find any scheme, please help me!! Thank you!!!

[Trevor21]

Re: Hkl-480201b hkl-500201b hkl-550201b psb repair

I have the same board, but mine has a different problem, there seems to be now voltage on the output to the back light's, does anyone have a circuit diagram for this PSU.

Thanks

[GradientWizzard]

Re: Hkl-480201b hkl-500201b hkl-550201b psb repair

Hello Guys,

New to the forum. Sorry for reviving such an old post. I currently own a Baird 55" with the same motherboard. My TV is currently stuck in standby, once I press the power button, the screen will do like a little flicker and not actually come on, any one got any idea with this type of stuff? Sorry for the newbie question.

[dick_barton]

Re: Hkl-480201b hkl-500201b hkl-550201b psb repair

Have you checked D10 & D11 as identified as a possible fault.

[GradientWizzard]

Re: Hkl-480201b hkl-500201b hkl-550201b psb repair

I'm looking at the board and can't seem to fine D10/D11, unless I'm blind as a bat ��