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Lg rh397d and the hello lcd just keeps playing but unit wont turm on

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Problem is caused by unstable 12v supply to HDD.

To fix you need to replace the 1000uF 25V capacitor in the power board. The failing capacitor has a expanded casing and there was two of these in my daughters unit.

Worked OK once I replaced the 2200uF and the 1000uF capicitors.

GDW

Posted on Dec 24, 2010

  • Don Batten Jan 09, 2011

    Yes, this is a common problem, caused by cheap capacitors in the power supply board (back left-hand corner of the case, next to the DVD player). Replacement power supply boards are available for anyone who is not up to the soldering. These cost ~$US50, compared to a 2 or 3 dollars total to buy the two capacitors (which must be the low ESR type, which are readily available from electronics parts places). The only tricky part to replacing the power supply board is levering the board off a 16-pin plug. Just level it a little at a time and line up the new one properly and gently but firmly push it on (it's not difficult). I replaced seven capacitors in this region of the board (C121, 123, 124, 125, 133, 134 and 135) for $8, just to reduce the chance of having to revisit repairs in the near future.

  • Bryan Jones Aug 24, 2012

    Worked for me, thanks for your help!! Cost$3.80 instead of $150+ Bryan

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Hi Graham,
I found I had to replace all three of the 1000uF caps and the 2200uF cap. As a general rule, I just replace them all in SMPS's and it works.
Testing the old caps reveals most of them are way out of toleranve and/or have high ESR's.
Neil

Posted on Aug 03, 2016

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My LG RH397D will not play a disk. It gives a navigation error.


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iog77.jpg

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Hi i have an lg rh397d and the hello lcd just keeps playing but unit wont turm on?


There is a bad capacitor in the power supply that controls the 12V going to the HDD and DVD player. When you turn it on, the 12v drops to 7 volts and the unit turns it self back off. You just get the "hello" message briefly. You need to replace the part (1000uf, 25v), it's probably showing signs of bursting at the top or bulging.I noticed this in a 397d that came to me from a relative. I've just replaced this part in it and it's come good again.See bad caps at www.badcaps.net for why this happens.

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