Konka KLC-TM3718 - AC in, no DC out - all caps, fuses, diodes, rectifier fine

[Daize]

Re: Konka KLC-TM3718 - AC in, no DC out - all caps, fuses, diodes, rectifier fine

I wouldn't trust a Skyvin board; I've never seen them in TVs. Whilst Megmeet et al are not good power supplies they are at least capable of putting out their rated power (until a cap bloats or a FET fries.)

Hmm, yes I've never seen them either. They appear to be popular in China though.

I'm not too bothered by the quality if it can supply enough current for now. I mainly just want to see if the TV works before putting more money in it. If this board can at least show me that the panel and mainboard work then I'll take the time to fix the original supply. I'd only want the Skyvin for a couple of months.

Is there a reasonable chance it might work for a few months?

[tom66]

Re: Konka KLC-TM3718 - AC in, no DC out - all caps, fuses, diodes, rectifier fine

Yes, it'll probably work.

[Daize]

Re: Konka KLC-TM3718 - AC in, no DC out - all caps, fuses, diodes, rectifier fine

Yes, it'll probably work.

Hmm. I hope so. If I was told a resounding no, I would have tried to get my money back but I was hoping there may be a chance it could work so I could avoid the hassle.

I can't stand Chinese online sellers. I know many Chinese people in person and they are all fairly honourable and pleasant people.

Why is it then that every Chinese seller that I've had to deal with online are so shady and money-grabbing? This would be at least my 10th bad experience with Chinese online sellers.

That doesn't include many obviously scam auction listings I've seen and haven't fallen for...

[Clydeuk]

Re: Konka KLC-TM3718 - AC in, no DC out - all caps, fuses, diodes, rectifier fine

If you can figure out how to get a 24 volt supply you should be able to fire the rest up with an old PC power supply. I keep a few old supplies from LCD and Plasma sets for testing, and some AT and ATX supplies for low voltage, one day I will build them into a box of some kind.

How about 2 x 12volt car batteries in series lol. I've done worse!!!

[Daize]

Re: Konka KLC-TM3718 - AC in, no DC out - all caps, fuses, diodes, rectifier fine

If you can figure out how to get a 24 volt supply you should be able to fire the rest up with an old PC power supply. I keep a few old supplies from LCD and Plasma sets for testing, and some AT and ATX supplies for low voltage, one day I will build them into a box of some kind.

How about 2 x 12volt car batteries in series lol. I've done worse!!!

Haha, my bench supply is made from an old server power supply I had lying around. Unfortunately no 24v though! I guess I can't run a few atx supplies in series for 24v and more in parallel for the amps

I should really get a decent bench supply...

[Daize]

Re: Konka KLC-TM3718 - AC in, no DC out - all caps, fuses, diodes, rectifier fine

Actually, would the panel power up without the backlight? I could shine a torch into it to see if the panel and mainboard are working. I know some sets I've had needed a backlight signal or they wouldn't start.

This TV looks mighty cheap though. I don't remember seeing any form of feedback to the mainboard from the inverters (although there may have been to the T-con now I think of it).

Pity. I got all excited for a moment haha.

[Clydeuk]

Re: Konka KLC-TM3718 - AC in, no DC out - all caps, fuses, diodes, rectifier fine

Yes most likely it will, maybe no audio if the 24v is used for that as well.

[Clydeuk]

Re: Konka KLC-TM3718 - AC in, no DC out - all caps, fuses, diodes, rectifier fine

I've kept a fantastic SMPS from an old cheap crappo TV I acquired with duff tab bonds. It is only used for a main supply so outputs 24v and 12v I think, no standby or anything. Rugged and well made as well surprisingly. I may use this as a base to bulid something for testing.

[Daize]

Re: Konka KLC-TM3718 - AC in, no DC out - all caps, fuses, diodes, rectifier fine

I've kept a fantastic SMPS from an old cheap crappo TV I acquired with duff tab bonds. It is only used for a main supply so outputs 24v and 12v I think, no standby or anything. Rugged and well made as well surprisingly. I may use this as a base to bulid something for testing.

Mmm. I've been keeping an eye out for something like that but I've always managed to fix the things they were in. I really should just fork out for a decent one.

The server PSU is good enough for most things though. It was only an OEM Chinese one made for Dell (maybe Delta or similar cheap junk).

I'm back home so I'll dig out the old power supply board and take a photo of it soon.

[tom66]

Re: Konka KLC-TM3718 - AC in, no DC out - all caps, fuses, diodes, rectifier fine

maybe Delta or similar cheap junk

maybe Delta or similar cheap junk

maybe Delta or similar cheap junk

Delta do not make "cheap junk server power supplies". I have several and they are built very well.

[Daize]

Re: Konka KLC-TM3718 - AC in, no DC out - all caps, fuses, diodes, rectifier fine

Delta do not make "cheap junk server power supplies". I have several and they are built very well.

haha, sorry - didn't mean to offend. I used Delta supplies back in the PII to P4 days on low-end desktops and had a run of bad luck with them. I suspect they may have been a bit underpowered for the application though, so I probably shouldn't blame them.

I know, server stuff is a different story. The PSU I'm now using as a bench supply was fitted for almost eleven years since 2001 in a dual-Xeon Dell server and it was still going strong when the system was updated, so that's not bad. I'm pretty sure it is a Delta supply.

Anyhow, some news. I just checked the TV and it's rated to 195w at 240VAC (so much for my memory), what do you think? Still try the Skyvin or absolutely no go? =/

I might have a shot a bit later at powering the mainboard and panel with a computer PSU and see what happens. Do you think it would power on without the backlight? I know a lot of others I've messed with won't.

EDIT:arg, I really didn't want to have to deal with them. Should I perhaps try to get a CTN308-P or maybe CTN280-P since I guess this fellow sells all Skyvin boards...

[Daize]

Re: Konka KLC-TM3718 - AC in, no DC out - all caps, fuses, diodes, rectifier fine

Finally found the Megmeet's output ratings:
+5V 2A, +12V 3A, +24V 7A

1A over on both the 12v and 24v. I doubt the tv would need 3a on it's 12v, but what do we think about the 24v, might they have just been safe and over-powered the supply? Am I just being wishful(/reckless)?

Also, I'm not confident about the accuracy of those numbers anyhow...

[Clydeuk]

Re: Konka KLC-TM3718 - AC in, no DC out - all caps, fuses, diodes, rectifier fine

There will usually be some leeway in the ratings, though cheapo sets not always. You are going in the wrong direction though, you need higher. I suppose you could lower the backlight settings after measuring the current drain, but it's not an ideal solution.

I suspect it will work, for how long is the thing?

[Daize]

Re: Konka KLC-TM3718 - AC in, no DC out - all caps, fuses, diodes, rectifier fine

...

Ah, I don't really care if it kills the power supply within a couple of months. I just want to see if the thing works.

Unfortunately I don't think I really have much of an option anyway. They'll want more money for the higher rated board, which I don't want to pay without knowing if the thing will even work. I don't even watch TV, I just haven't had an LCD of this size before haha I want to see it working.

By the way, my old board wasn't as bad as I remembered. I'm just trying to find my camera and I'll upload a photo for you.

[Daize]

Re: Konka KLC-TM3718 - AC in, no DC out - all caps, fuses, diodes, rectifier fine

Here's my old burnt board. It's not that bad, but not something I have the time to mess with right now (although I've wasted a lot of time tonight... =/ ).

[Daize]

Re: Konka KLC-TM3718 - AC in, no DC out - all caps, fuses, diodes, rectifier fine

Sorry to keep dragging this thread out. If you think I should make a different one just say so.

Two bits of news:

• I powered the LCD panel and mainboard (no 24v for backlight) from my bench supply and connected it via DVI to my computer and got a picture. I hope that means all is well on the remainder of the television.
  
• The second thing is that I was able to get a 'credit' from the Chinese company to cancel the original order and buy something else (it must be from taobao.com).
  
  I found this, and it seems to meet the ratings. Apart from wiring new connectors to the original harness, is there any reason this wouldn't work?
  
  I doubt it is a Megmeet MLT198TL supply as the page implies, I think it will be another Skyvin (possibly part CTN-295-MLT198TX-M, not sure). The claimed rating is +24V 9A, +12V 5A and +5V 4.5A.
  
  I think my original Megmeet MLT083 power supply was +24V 7A, +12V 3A and +5V 2A. Therefore it should be safe to assume the above should be fine?

http://item.taobao.com/item.htm?id=19395876432

[tom66]

Re: Konka KLC-TM3718 - AC in, no DC out - all caps, fuses, diodes, rectifier fine

It would appear everything is functional, sans backlight.
That supply would probably be capable, as long as its ratings are genuine.