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junkpete replied to Reboot cycle on Samsung TV: UE 40D (5700)

in Troubleshooting TVs and Video Sources

08-26-2018, 01:04 PM
Re: Reboot cycle on Samsung TV: UE 40D (5700)

I replaced the two bigger 100/35 SMD caps (I only had THT caps, but never mind), since one of them had a very bad ESR and now the TV set works again.

Thanks for your help!

The two caps I replaced

[url=https://ibb.co/d38dYU][/url]

Whatever works

[url=https://ibb.co/jGj7Sp][/url]

No reboot cycle anymore and the picture is back:

[url=https://ibb.co/mp6yYU][/url]Re: Reboot cycle on Samsung TV: UE 40D (5700)

I replaced...

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junkpete replied to Reboot cycle on Samsung TV: UE 40D (5700)

in Troubleshooting TVs and Video Sources

08-25-2018, 03:20 AM
Re: Reboot cycle on Samsung TV: UE 40D (5700)

I decide by myself whether I want to spend my time on this or not. So thank, but no thanks.

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junkpete replied to Reboot cycle on Samsung TV: UE 40D (5700)

in Troubleshooting TVs and Video Sources

08-24-2018, 11:26 AM
Re: Reboot cycle on Samsung TV: UE 40D (5700)

I am actually a physicist with a decent equipment and a good amount of theoretical understanding (which doesn't help much, haha). I repair all kind of stuff when I find some free time, but I have no professional training, especially not with TVs (this is my first TV project).

I also don't have any deadline since it's my own set

Any hints are welcome.. I am not sure if replacing all kinds of capacitors on the signal board is the way to go now. I could also measure their ESRs but it's quite fiddly and I hope...

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junkpete replied to Reboot cycle on Samsung TV: UE 40D (5700)

in Troubleshooting TVs and Video Sources

08-24-2018, 03:14 AM
Re: Reboot cycle on Samsung TV: UE 40D (5700)

I got a preprogrammed WT61P805 for 10 Euros and swapped that out. I also measured the IC 202 before to check if it regulates to 3.3V and it does (I fed in +5V externally to test it).

So now I am at the beginning... a black screen and no sound (I guess when I reset the main EEPROM, the tuning was reset too).

The current status is:

WT61P805 replaced, IC 202 is OK, main EEPROM reset and also replaced.

Symptoms: red LED blinking for a few seconds, blacklight is on for a few seconds, no...

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junkpete replied to Reboot cycle on Samsung TV: UE 40D (5700)

in Troubleshooting TVs and Video Sources

08-16-2018, 01:55 PM
Re: Reboot cycle on Samsung TV: UE 40D (5700)

Is there a cheap device which can write that dump? I only have programmer for 4/8 and 16 pins...

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junkpete replied to Reboot cycle on Samsung TV: UE 40D (5700)

in Troubleshooting TVs and Video Sources

08-14-2018, 09:03 AM
Re: Reboot cycle on Samsung TV: UE 40D (5700)

I will check that, I just need to reinstall the old chip ...

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junkpete replied to Reboot cycle on Samsung TV: UE 40D (5700)

in Troubleshooting TVs and Video Sources

08-14-2018, 05:51 AM
Re: Reboot cycle on Samsung TV: UE 40D (5700)

Damn, I just noticed... I replaced it and now it won't do anything at all when I plug the TV in.

Of course the backlight is on when I disconnect the logic board.

I don't have any tools to flash it. Is it worth to buy the equipment?...

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junkpete replied to Reboot cycle on Samsung TV: UE 40D (5700)

in Troubleshooting TVs and Video Sources

07-27-2018, 09:23 PM
Re: Reboot cycle on Samsung TV: UE 40D (5700)

Yes, this TV has a WT61P805. OK, so I'll replace that too... I'll report back.

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junkpete replied to Reboot cycle on Samsung TV: UE 40D (5700)

in Troubleshooting TVs and Video Sources

07-27-2018, 03:52 PM
Re: Reboot cycle on Samsung TV: UE 40D (5700)

Alright, I replaced the NAND chip by a new one (I managed to get one for 25 Euro) and the TV set has still the same symptoms. I also detached the mainboard and then the lights are permanently on.

Any ideas what to do next? :-/

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junkpete replied to Reboot cycle on Samsung TV: UE 40D (5700)

in Troubleshooting TVs and Video Sources

07-14-2018, 01:33 PM
Re: Reboot cycle on Samsung TV: UE 40D (5700)

Yes, I removed both also both ends, no overheated sign anywhere.

> BTW, if you disconnect the cable between the power supply and the main board, do the backlights stay on when you apply AC to the TV?

Yes, the backlights are then permanently on.

I found a guy in my home town who sells the chip for 30EUR ([url]https://www.badcaps.net/forum/showthread.php?p=838897#post838897[/url]), so I guess I will try that next week.

Or are there any other thoughts?Re: Reboot cycle on Samsung TV:

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junkpete replied to Reboot cycle on Samsung TV: UE 40D (5700)

in Troubleshooting TVs and Video Sources

07-14-2018, 08:57 AM
Re: Reboot cycle on Samsung TV: UE 40D (5700)

Yes I do! It drops to around 375V when the TV reboots and then comes up to 391V again and stays constant until the backlight is off again (and the reboot happens).

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Last edited by junkpete; 07-14-2018, 08:59 AM.
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junkpete replied to Samsung UE46D5500 keeps rebooting

in Troubleshooting TVs and Video Sources

07-14-2018, 08:13 AM
Re: Samsung UE46D5500 keeps rebooting

Seems like I have a similar issue (I just started another thread). @lipo would it be possible to ask the guy if he could do it for my set too?

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junkpete started a topic Reboot cycle on Samsung TV: UE 40D (5700)

in Troubleshooting TVs and Video Sources

07-14-2018, 07:57 AM
Reboot cycle on Samsung TV: UE 40D (5700)

Hey guys,

I hope you help with with my Samsung TV: UE 40D (5700)

A few days ago when I turned it on, it started to reboot every few seconds. This is the loop cycle:
[LIST][*]red LED in front blinks a few seconds (display is black)[*]picture appears, sound is playing for about 5 seconds[*]everything turns black and the loop starts again[/LIST]

I measured a few caps on the PSU but they seem to be fine. Visual inspection also did not reveal anything suspicious.

When I disconnect the mainboard from the PSU and turn the power on, the background...

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Last edited by junkpete; 07-14-2018, 07:58 AM.
junkpete replied to New Members - please post your introductions here

in Announcements & Related News

07-14-2018, 07:11 AM
Re: New Members - please post your introductions here

Hey guys!
So first, thanks for maintaining this forum, I already found very useful information several times!
I am a physicist and I love repairing stuff: either machanical, software or electronic things.
So that's it basically, I hope I can give something back, but my electronics knowledge is still too theoretical
Cheers!

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Reboot cycle on Samsung TV: UE 40D (5700)

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