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Hi i am having problems with my 37" LG lcd tv. Model 37lB1DB When i power it on , i hear the relays click on but i get no picture or sound; on this tv at the bottom the power light indicator and the cassette tape light both come on but does nothing else after that. Upon opening and testing i found the 12v outputs to be 11v but the rest are okay and on the mainboard there are 4 led's lit but one is out which is next to one of the power connectors, i wonder if its a problem with the power supply or the mainboard. P.S Its nothing to do with fuses, loose wires, bad soldering joints, buldging capacitors as these have been checked over. Or if anybody knows what the exact fault could be? I can send pictures and a video if it would help. Power supply is an LGLP2637HEP Mainboard is PD61A thanks regards jonno

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  • Jonathon summesfield Apr 24, 2009

    Thanks, but i brought it off ebay, and i might repair the SMPS.
    I have also noticed aswell the power LEd blinks 7 times then the VCR tape lights up.

  • Jonathon summesfield Apr 27, 2009

    Hi thanks mate, now i know this infomation i want to know if anybody would know how to fix this. Closer inspection is that the 12V Rail comes from a YG862006 SCHOTTKY Diode, would this cause the problem where the voltage of 12v would be lowered to 11v?

  • Jonathon summesfield Apr 27, 2009

    Thanks , ive been wondering whether the main board was the problem in the first place, when i first brought it the bloke said a tv repair man said something about the mainboard, but this was off ebay and you dont really know what to expect with a power problem as you probably know yourself lol. Now i know the powersupply is fine i can go about and sorting out the mainboard and find the regulator I.C and check for voltage. And since there is an indication led out on the mainboard that also gave me an idea that there could be something wrong with the mainboard, once the relays click all but one come on so thanks very much :)
    i will go have a look at that and report back.

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Hi Junno,

Firstly, I would like to ensure you that your power supply is not having any problem. As you were suspecting because of 11V, I must make you sure in electrnics systems its not very sure that always power is exactly what needed. In all electronics equipments we keep a range of DC power supply...

So please, don't worry about power supply. Now come to your problem. Actually, as we are sure that power is OK then in this mainboard problem is also possible but as you have already told that RELAYS are switching properly,it means only internal circuitry of mainboard can have problems.

Since relays works out of modules of Mainboard, so it also refers that mainboard is having some problem. Also, I wanna give you more assistance on such problems.

Generally it is found that these problems are due to regalator IC of mainboard. And solution of such problems needs CRO testing and module-wise checking. And its very affordable too. So, i recommend you to go for a technician & let its regulator IC (named as 7812) to be cross-checked again. And then that person will check your graphic adaptor too.

Surely you will get rid of this problem by this. If you are enough technical person, then do this yourself and no need to depend on any repairman.

Thanking you...rate this solution if it was really helpful to you.

With Regards,
Shyny


Posted on Apr 27, 2009

  • Shyny Saxena
    Shyny Saxena Apr 27, 2009

    No not at all. As i said above, 11v doesn't mean that your mainboard won't work. Yes, is true that Schottky doide ensures 12V but when we test main boards in our testing departments, we assume a range of voltage supply, ie. from 10.4 V to 13.5V.
    So please don't worry about power supply.

    With regards,
    Shyny


  • Shyny Saxena
    Shyny Saxena Apr 27, 2009

    Thanks sir. Surely you will get rid of this problem. As you can see, its very logical too that power supply can't have problem. Anyways, i hope you really understood my suggestion.

    Hope for best & let u enjoy your T.V. soon...

    I'll wait for your response.

    With Regards,
    Shyny


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6 or 7 blinks on LG tv is not a fault code. It is only saying that the TV is on protection mode because there is a fault.

LG LCDs have no blink code.

I do not have service manual for your model, but you can check similar models below:

32lx4dc

42lp1d

You can get service manual for your model here, you won't find blinking codes, but you can followi troubleshooting diagram to test the tv : getMANUAL.com

Posted on Apr 24, 2009

  • Navicura Oct 28, 2010

    I have the same PSU (LGLP2637HEP) but a different LG LCD TV.

    My problem is that I get a HIGH (5V) at the 5V ST (Standby), but my ACD (AC Detect) is LOW (0V). Any ideas as to what could the problem be? I do not have, nor I can find the PSU Schematics.

    No bulged capacitors and measured the capacitance, and I have tested multiple parts already

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Hi

That sounds like a power supply problem. Possibly a voltage rail has gone down. It might only be a blown fuse or a blown component but it could be something more serious if you have already tested the fuses.

Unfortunately, the problem requires an engineer's visit or you could try and find a new power supply on ebay or somewhere else and replace it yourself.

I believe though that you are within your consumer rights to have the TV repaired by the retailer or manufacturer even if the guarantee has run out. Something to do with the TV not providing service for a reasonable amount of time before failing.

Hopefully someone will post information about your consumer rights because I know nothing about them!

All the best

Posted on Apr 24, 2009

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