Hi,
I was reading the post about the faulty tv. Did you manage to repair the tv?
I have the same problem.
I could really appreciate any help.
Thanks,
George, Greece
JavierC
Member
Last Activity: 09-11-2019, 07:34 AM
Joined: 05-21-2014
Location: Barcelona
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Re: Samsung LE37C630K1W - Random power on
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Re: Samsung LE37C630K1W - Random power on
After reading some PDFs about diagnosing PSU and LCD TVs, and studying some basics about switching power supply, and after analysing the PSU schematics, I think the problem could be the Half-Bridge Resonant Converter, which is the FSFR1700US.
Have anyone experienced a problem with this power switch before?
I will also replace CS 801 1250V 22nFLeave a comment:
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Re: Samsung LE37C630K1W - Random power on
I forgot to mention that, the backlight turned on during this, and also I believe the buzzing noise from the inverter was almost imperceptible.Leave a comment:
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Re: Samsung LE37C630K1W - Random power on
Today I decided to do some more testings on my TV.
With the Power board only connected to the Inverter, and not he Main, I disconnected the INV_ERR cable from the ribbon and didn´t connect it to anything.
Then I plugged the Power board to the mains, and could verify that the INV_ERR pin on the Inverter side measures 0V, but the same pin on the Power board measures 1,2V.
Which means the problem is definitely on the Power board.
Now, from here I´m lost. What should I do next?...Leave a comment:
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Re: Samsung LE37C630K1W - Random power on
Update !
I re-soldered the joints of the transformers and MosFETS of the Inverter board, and now the TV turns on more frequently. Sometimes Tv starts at the first attempt, other times the backlight blinks two or three times during the startup cycle, and eventually stays on
I took some more measures and found that with the Power Supply board disconnected from the Main and Inverter boards, there are 1,2 Volts on the INV_ERR pin. Shouldn´t this be 0V ?
Then, when I connect the Main and Inverter Boards,...Last edited by JavierC; 05-29-2014, 03:02 AM.Leave a comment:
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Re: Samsung LE37C630K1W - Random power on
Today I went back to my repair project. After a few days disconnected, the TV started on the first attempt. I Actually managed to turn it on and off some 5 times,and took a few more measures. But then the problem came back.
With the TV on, the inverter board makes a buzzing noise, which I believe is louder than it should be. Couldn´t identify which of the inverter transformers is the culprit of the noise though.
The electrolytic capacitors on the inverter board measured the same voltage, around 20 V when the...Leave a comment:
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Re: Samsung LE37C630K1W - Random power on
Browsing the net, found a website in the UK selling a "POWER SUPPLY REPAIR KIT BN44-00339B QP801 QP802 FAULTY"
Power supply repair kit? Really? Do this mean that those are the only components needed for fixing this specific Power supply?
[URL="http://www.ohmsupplies.co.uk/epages/62027733.sf/en_AU/?ObjectPath=/Shops/62027733/Products/KIT296&ViewAction=ViewProduct"]http://www.ohmsupplies.co.uk/epages/62027733.sf/en_AU/?ObjectPath=/Shops/62027733/Products/KIT296&ViewAction=VLeave a comment:
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Re: Samsung LE37C630K1W - Random power on
There you go...Last edited by JavierC; 05-22-2014, 03:21 AM.Leave a comment:
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Samsung LE37C630K1W - Random power on
Make: Samsung
TV Model: LE37C630K1W
PSU Model: BN44-00339B
Main Model: BN41-01443A
Inverter Model: 4H.V2988.071/A1 E206453 V298-5XX*
A friend of mine gave me this TV as he got fed up and bought a new one.
He said the TV turns off randomly and will not turn on again for a few hours/days. Eventually it turns on again, and sometimes fails straight away, other times it worked just fine for a few weeks/couple of months until it happens again.
When I plugged in the first time, it worked! and I managed to enjoy a fully functional tv...Last edited by JavierC; 05-22-2014, 04:05 AM. -
Re: New Members - please post your introductions here
Hi Everyone,
I´m Javier, from Barcelona.
I´m an IT engineer, with some background in electronics. Have a degree in Electrical Engineering (power systems) though.
Very glad to be part of this great community.Leave a comment:
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