Hitachi LE55A6R9 LED Issue or?

[budm]

Re: Hitachi LE55A6R9 LED Issue or?

Oh wow, can't believe I found a thread about the same exact model TV, and with a very similar problem... and people who actually seem to know what they're talking about

My situation: a TV at a friend's house died a week ago. Hitachi LE55A6R9 LCD TV, powers on, switches inputs/sources, and there is an image on the screen if I shine a flashlight onto it. But the LCD backlight is dead, all black.

I have a digital multimeter, and a soldering iron, and know how to desolder / solder in basic electronic components. But I have no clue which components are responsible for this failure. Also, I'm willing to order replacement parts, but I don't know which parts to order. (I'm not there to keep messing around with additional tests).

Not really looking to make this a complicated project, just doing a favor for a friend who's on a limited budget and doesn't want to throw out a $ 600 TV.

So, in a situation like this, where the backlight is totally dead - what should I look for as far as replacement parts? Either an entire board, or solderable components? (I doubt I can replace SMD devices, but standard solder connections shouldn't be a problem).

Also, if it's a matter of replacing individual components, I'd really appreciate any heads-up about potentially dangerous capacitors...

Any advice would be much appreciated!

Read post 45 and later.

[dskall]

Re: Hitachi LE55A6R9 LED Issue or?

In a dark room do backlights flash on when first powered on?

[tjonnyc]

Re: Hitachi LE55A6R9 LED Issue or?

Oh wow, can't believe I found a thread about the same exact model TV, and with a very similar problem... and people who actually seem to know what they're talking about

My situation: a TV at a friend's house died a week ago. Hitachi LE55A6R9 LCD TV, powers on, switches inputs/sources, and there is an image on the screen if I shine a flashlight onto it. But the LCD backlight is dead, all black.

I have a digital multimeter, and a soldering iron, and know how to desolder / solder in basic electronic components. But I have no clue which components are responsible for this failure. Also, I'm willing to order replacement parts, but I don't know which parts to order. (I'm not there to keep messing around with additional tests).

Not really looking to make this a complicated project, just doing a favor for a friend who's on a limited budget and doesn't want to throw out a $ 600 TV.

So, in a situation like this, where the backlight is totally dead - what should I look for as far as replacement parts? Either an entire board, or solderable components? (I doubt I can replace SMD devices, but standard solder connections shouldn't be a problem).

Also, if it's a matter of replacing individual components, I'd really appreciate any heads-up about potentially dangerous capacitors...

Any advice would be much appreciated!

[budm]

Re: Hitachi LE55A6R9 LED Issue or?

The new set of the LED may have bad solder joints on the connector pins that join the two strip together.
Glad to see it is working.

[LITEZONER]

Re: Hitachi LE55A6R9 LED Issue or?

1/2 hour in.

[LITEZONER]

Re: Hitachi LE55A6R9 LED Issue or?

PS Pretty good pictures right? LOL

[LITEZONER]

Re: Hitachi LE55A6R9 LED Issue or?

well perplexed a bit, every led on the string that would not light tested good individually, but the string would not light as a whole, I replaced it with a used one i had from the old set, now were cooking i think, will post final results when assembled and working. remember, this was a brand new set of LED strips ordered from a reputable company, SJ, Lesson here, TEST,TEST,TEST, even if it is brand new, it would have taking me a few seconds to check this before spending all the time. trying to figure this thing out, assembly, disassembly, and wasting other folks time as well. Valuable lesson learned here.

[LITEZONER]

Re: Hitachi LE55A6R9 LED Issue or?

I wanted to show how these wires R/B and R/W go to the led's

[LITEZONER]

Re: Hitachi LE55A6R9 LED Issue or?

well that's not good news, :-( I will tear it back down and see what i can find. will post findings in a bit, Thank you budm and everybody for all your help, Much appreciate this site. and all the great people willing to lend a hand, not too common these days so i'm grateful.

[budm]

Re: Hitachi LE55A6R9 LED Issue or?

whole panel lights up only with led tester probes on red and black wires, red and white does nothing when led tester probes are placed on these two

Well, that means the LED string connected to the RED/WHITE wires is dead, you have two LED strings connected in series as you can see how they are connected by looking at the bottom side of the board where the two LED connectors are.
https://www.badcaps.net/forum/attach...5&d=1498188398

[LITEZONER]

Re: Hitachi LE55A6R9 LED Issue or?

whole panel lights up only with led tester probes on red and black wires, red and white does nothing when led tester probes are placed on these two

[budm]

Re: Hitachi LE55A6R9 LED Issue or?

tried post 52 and have nothing.

??? But you indicated that LED lights up.

[budm]

Re: Hitachi LE55A6R9 LED Issue or?

I put POS+ and NEG- across red and black, and panel lights up??? should I test each wire with ground to chassis?

But how about the second LED string, the one connected to the Red (Anode) and White (Cathode) Wires?

[LITEZONER]

Re: Hitachi LE55A6R9 LED Issue or?

tried post 52 and have nothing.

[LITEZONER]

Re: Hitachi LE55A6R9 LED Issue or?

I put POS+ and NEG- across red and black, and panel lights up??? should I test each wire with ground to chassis?

[budm]

Re: Hitachi LE55A6R9 LED Issue or?

chassis ground-/ pos + to terminals

Top red wire = 267 V
Blck wire = 187 V
Red wire = 187 V
White wire = 0 V

The LED string with Red/White wire does not look right. Did you use the LED tester to test both LED strings by applying the tester to each LED connector?

[LITEZONER]

Re: Hitachi LE55A6R9 LED Issue or?

Sure hope it's not an open LED circuit in the new strips somewhere, here is the reply i received from SJ on replacement set.
Hello
Sorry to hear that's the case! Unfortunately we do not currently have these strips available to replace for you, we likely won't see more for another 1-2 months. Happy to take this back for a full refund of course. You can head here; (Omitted) to set up a return for refund and print a prepaid USPS shipping label to cover the return shipping back to us. Don't hesitate to ask if you have any questions on this.

Regards,
Austin Manning
Customer Service

[LITEZONER]

Re: Hitachi LE55A6R9 LED Issue or?

there are a few of these on the board.

[jetadm123]

Re: Hitachi LE55A6R9 LED Issue or?

I get continuity at the depicted places, not sure about 0 ohm resistors not even sure why there would be such a thing as a 0 ohm resistor???

0 ohm resistors are generally used as a jumper.

[LITEZONER]

Re: Hitachi LE55A6R9 LED Issue or?

chassis ground-/ pos + to terminals

Top red wire = 267 V
Blck wire = 187 V
Red wire = 187 V
White wire = 0 V