lg42 lh2000

[welshlad27]

hi guys i have got a 42lg lh2000 stuck on a red standby /power light ,
i have replaced the psu 4 times and still no joy with it comeing on

been told it cud be the av board or even the noise filter were the mains plugs in ne 1 have ne other ideas please

[Alastair E]

Re: lg42 lh2000

A pic of the chassis and the various boards would help....

[welshlad27]

Re: lg42 lh2000

pic of the chassis and the boards



capture screen


screen shots


screencast

[Alastair E]

Re: lg42 lh2000

When you Try and turn on,--does the red-light go off--even for half a second?

From turning mains on--does the red-light flash at all?

Any flicker/life at all from the backlight when turned on?

[welshlad27]

Re: lg42 lh2000

no to all of that mate .its just stays a solid red /orange colour

[tom66]

Re: lg42 lh2000

What made you consider the power supply initially? Have you checked any of the voltages from the PSU board?

[Alastair E]

Re: lg42 lh2000

Sounds to me there's some issue with the mainboard....

Whats its full number, I'll have a look on Monday--see if I have one, that chassis is pretty common, scrapped a few over the months....

[welshlad27]

Re: lg42 lh2000

What made you consider the power supply initially? Have you checked any of the voltages from the PSU board?

thats what i was told by a tv tech that psu was the fault ,now it looks like its no the fault

[welshlad27]

Re: lg42 lh2000

Sounds to me there's some issue with the mainboard....

Whats its full number, I'll have a look on Monday--see if I have one, that chassis is pretty common, scrapped a few over the months....

give me 5 and ill get u main board model number

[Alastair E]

Re: lg42 lh2000

Great!

BTW--Please could you use Full Words in posts as in 'You' not u,-- it can piss some guys off!

Back in work Monday, so I'll have a look--no guarantee I'll have the right one though.

[welshlad27]

Re: lg42 lh2000

Sounds to me there's some issue with the mainboard....

Whats its full number, I'll have a look on Monday--see if I have one, that chassis is pretty common, scrapped a few over the months....

ld91a/g
eax60686904(2)
09.04..09 n t y

[welshlad27]

Re: lg42 lh2000

Great!

BTW--Please could you use Full Words in posts as in 'You' not u,-- it can piss some guys off!

Back in work Monday, so I'll have a look--no guarantee I'll have the right one though.

sorry force off habit .and thank you very much

[johnboy1313]

Re: lg42 lh2000

I just brought home a very similar 37lh20 two days ago with the exact same problem. You can force the PSU on with two resistors to test the PSU and the inverter.

[welshlad27]

Re: lg42 lh2000

I just brought home a very similar 37lh20 two days ago with the exact same problem. You can force the PSU on with two resistors to test the PSU and the inverter.

im sure the 37 lh2000 is same boards in side .how do i do that please

[johnboy1313]

Re: lg42 lh2000

If I remember correctly, on my PSU, the connector that has the harness that runs from the main board to the PSU has a pin marked "on/off" and one marked "INV on". Run one 1K ohm resistor from the 5.2V pin to the "on/off" pin and the other one from another 5.2V to the "INV on" pin. Post a close up picture of that connector on your PSU. It needs to be clear enough to read the markings for each pin. One of us will tell you exactly how to do it.

This is from another TV, but it should give you the idea.
https://www.badcaps.net/forum/attach...6&d=1355670365

[welshlad27]

Re: lg42 lh2000


capture software

[selldoor]

Re: lg42 lh2000

Yes just connect 500ohm to 1000 ohm resistors as JB1313 says

Also we prefer pictures posted with "manage attachments" as in time yours will disappear making the post less useful for others in future

[johnboy1313]

Re: lg42 lh2000

OK, thanks for the pic. Like selldoor says, "managa attachments" is considerably easier for us to use. We can copy the pic and highlight areas for you if you use manage attachments.

Back to the subject at hand. Plug the harness into that connector and unplug the other end from the main. If your set is like mine, there should be one blue wire and the rest in that harness are grey. Place the end of one resistor into the hole in the connector directly next to the blue wire. Skip two holes and place the other end of that resistor into the hole for 5.2V. Put one end of your other resistor into the third hole down from the other end in the same row. Put the other end into the hole directly above the hole that has the other resistor in it for 5.2V. There are four pins for 5.2V, you should be able to use any of the other three.

[johnboy1313]

Re: lg42 lh2000

Hope this helps

[johnboy1313]

Re: lg42 lh2000

To be clear, the PSU should be mounted in the TV with all harnesses connected to it. Unplug the set from the power outlet before you start. Plug it in once you've used the resistors and the backlights should come on at that point.