LG 42LD560 - Worth fixing?

[A/V]

Hey guys,
So glad I found this forum.

I have recently acquired the LG 42LD560 LCD TV for cheap. I thought that it may be fixable, but not so sure after all that is not working on it.

The good:
- Powers on and off fine,
- Initial screen displaying LG logo and time (to be set) looks perfectly fine,
- Backlight seems to work fine
- Able to navigate through menus fine

The bad:
- After the initial screen, the screen dims a bit and flickers constantly,
- Tuner won't recognise any channels when auto-tuning so no channels,
- When plugging in a source (DVD, bluray etc) it just gives me the rotating cube of 'no signal',
- Speakers sometimes emit intermittent tapping sound

As the previous owner described it, one day when they turned on the TV to watch their Foxtel, (pay TV) they said they got the 'no signal' logo, but they could still hear sound. They tried running the auto-tuner on normal DTV, but it didn't find any channels, gave up and went and bought a new TV.

What I've tried:
- All capacitors look fine on the power board,
- Disconnected & reconnected all connections and they all look fine,
- Factory reset

From all the symptoms, my best guess is that I need a new main board.

What are all your thoughts?

Pics:

[tibimakai]

Re: LG 42LD560 - Worth fixing?

I had a 550 with bad main board also. Symptoms were different though.
It sounds like a main board problem.

[A/V]

Re: LG 42LD560 - Worth fixing?

I was quoted $245 for a new main board.

[A/V]

Re: LG 42LD560 - Worth fixing?

If that is the problem, I won't be going down that road.

[tom66]

Re: LG 42LD560 - Worth fixing?

That's the direct from LG price. It'll be cheaper to buy the part used (from a scrapped TV). Do you have a digital multimeter available?

[A/V]

Re: LG 42LD560 - Worth fixing?

That's the direct from LG price. It'll be cheaper to buy the part used (from a scrapped TV). Do you have a digital multimeter available?

Yes I do have a multimeter. Where would I find a scrap TV of this model? Would I just have to patiently wait til one pops up on ebay or something?

[tom66]

Re: LG 42LD560 - Worth fixing?

Is there a pin legend next to the power board connector which goes off to the main board?

The parts for these TV's are usually available on eBay, just search by EBR or EAX numbers printed on the board.

[A/V]

Re: LG 42LD560 - Worth fixing?

Yes, but I've read that the EAX number is not always the exact part, but that its better to go off the barcode stuck on there. Is that correct? The number on the main board is EAX61768305(1)

[tom66]

Re: LG 42LD560 - Worth fixing?

EAX = Assembly number, prefer this number
EBR = Blank PCB number, only use if model # also matches

[saddle_au]

Re: LG 42LD560 - Worth fixing?

The mainboard is bad. Solder balls under the processor chip have dry jointed. Sometimes it can be coaxed back to life doing a hot oven reflow but the fault will reappear. Shame though, really nice screen to view. My thought is it has a bad thermal design between expansions of the chips versus the pcb. Know of one that has come back doing this, but know of many more that haven't.

Faults reported include:
- Not booting past the clock image on the screen
- Booting to a spinning logo, but non-responsive to anything else
- Booting all the way, but then not having any inputs to select from, all options greyed out.
- Sitting there flashing the red standby light slowly, no boot at all.

Many reports of failure of this model (reminded me of the reports about HP 2015 printers). LG wiping their hands on this one, lowered the warranty from 3yr to 1yr after 2012 on new purchases (maybe knowing what was coming from units being returned? If not, a pretty good crystal ball was in use).

[2hry]

Re: LG 42LD560 - Worth fixing?

I have the same problem(55ld650). tried it with a heatgun and in the oven - not working.

red light fading and coming back, but tv doesnt turn on.

Would there be any other way to drive the lcd without the original Mainboard?
I cant find it in stock anywhere.

[Behemot]

Re: LG 42LD560 - Worth fixing?

Do you think leaded-solder reball would help? Or is the die-to-package connection itself bad so only replacing the CPU?

[adamp91gvm]

Re: LG 42LD560 - Worth fixing?

Get a heat gun on the top left chip on the av boad turn the tv on then heat the chip up screen will go green then stop heating turn it off and on and it will work

[adamp91gvm]

Re: LG 42LD560 - Worth fixing?

This one take the heat sync off first worked spot on on my ld490

[Behemot]

Re: LG 42LD560 - Worth fixing?

[husky601]

Re: LG 55LD650 - Worth fixing?

I have similar problem and i can not find any mother bord for it. When i plug the tv the standby light turn on. As soon i press on the power the standby light flash non stop and nothing happen. On the main board there is a small black buton, i guess it's a reset? If i plug it in and press on the small buton the back light turn on but for 0.1 second then shut down again. Any idea?

[husky601]

Re: LG 42LD560 - Worth fixing?

C9113. Dosent looks like a resistor, what is that?

[budm]

Re: LG 42LD560 - Worth fixing?

C = Capacitor
R = Resistor

[husky601]

Re: LG 42LD560 - Worth fixing?

Ok thank you much!! I did put the motherboard in the oven then re instal it in the tv and it did work but shut down every few minutes. Do anybody has an idea of what it could be?

[Extreme_Boky]

Re: LG 42LD560 - Worth fixing?

I had few issues with LG 32LD560.

The first one was loss of HDMI picture. I thought it was related to bad cable and left it at that.

The second issue that followed some 6 months later, was related to loss of picture and backlight. The TV would sit there flashing the red standby light slowly, no boot at all. So I opened the TV expecting to see the bulged / leaked capacitors. However, this was not the case - all capacitors were good, and the voltage rails correct once I turned the TV on - however, the TV would just sit there slowly flashing the red standby light.

So, I started looking at the processor board. I removed all the connectors and all the ribbon cables, re-connected - still the same. Then i read about processor and its solder joints drying up. So, I removed the heatsink (carefully, so that the double sided sticky tape can be re-used!!!), and used my heatgun to heat the processor – around 20 seconds at heatgun at low. Then, I pressed the processor down with a screwdriver handle. I placed the hetasink back without any issues. And this fixed the problem !!!!!! In addition to TV turning ON correctly, the HDMI inputs now work as well !!!!

I suppose some care is needed not to burn the processor, but the solder used has very low melting point, so as long as the heat is not applied for more that 15 – 20 seconds – everything should be okay.

I hope others will benefit from my experience. The LCD panel on this TV is of high quality, and the colours are great. We use it in our bedroom and love it.

The whole fault finding, power supply measurements and heatgun fix took less than an hour. I must say at the end that I am experienced DIY-er (check my posts at DIY audio forums…) , but anyone can do this if my instructions are followed correctly.

Cheers,
Nick