Sagem Axium HD-L32 LCD - Horizontal Lines

[fcda]

[Hello, first post]

I picked up a Sagem HD-L32 LCD TV with a display problem - horizontal lines, flickering across the screen. The lines are mostly black, green or red. The TV picture is visible behind/through the lines.

There's a vid on youtube of the problem: Sagem HD-L32

It happens as soon as you turn it on, and regardless of the input source (scart or RF). The longest I've left it on is about 20 minutes and it didn't appear to get worse (or better).

I'm hoping it's a capacitor problem, but before I try to open it up (and leave its contents spread around the room for days ) I thought I'd check on here. So does it sound like a capacitor issue?

I'll update this thread with more details when I get round to opening it up.

Thanks

[fcda]

Re: Sagem Axium HD-L32 LCD - Horizontal Lines

[Bumping my old thread as I've finally got round to opening it up for a look... ]

I was hoping to find some obviously bulging low quality caps, but the ones in the power supply section are all Rubycon and look fine. Mostly Rubycon elsewhere too. It's all quite clean inside too. I removed and re-seated the connectors between the mainboard and the inverter board and the other board connected to the LCD, but it's made no difference.

Here's how it looks on screen:



Anyone got any suggestions to help narrow down the problem?

Cheers

[PlainBill]

Re: Sagem Axium HD-L32 LCD - Horizontal Lines

[Bumping my old thread as I've finally got round to opening it up for a look... ]

I was hoping to find some obviously bulging low quality caps, but the ones in the power supply section are all Rubycon and look fine. Mostly Rubycon elsewhere too. It's all quite clean inside too. I removed and re-seated the connectors between the mainboard and the inverter board and the other board connected to the LCD, but it's made no difference.

Here's how it looks on screen:

Anyone got any suggestions to help narrow down the problem?

Cheers

Scaler on main board, t-con, or panel would be my guesses. Nothing much can be doen if it's the panel. I'd look the t-con over for voltage regulators and make sure they are providing the proper voltage. After that, do the same for the main board.

PlainBill

[fcda]

Re: Sagem Axium HD-L32 LCD - Horizontal Lines

Thanks for the suggestions.

The T-Con board is the one at the top centre behind the LCD, right?

It's marked V32B C3. Looks like this one:



How can I work out what the voltages should be?

[I should add (in case it's not obvious), this is the first LCD TV I've pulled apart I've repaired a few digibox power supplies, but just obvious faults.]

[PlainBill]

Re: Sagem Axium HD-L32 LCD - Horizontal Lines

Thanks for the suggestions.

The T-Con board is the one at the top centre behind the LCD, right?

It's marked V32B C3. Looks like this one:



How can I work out what the voltages should be?

[I should add (in case it's not obvious), this is the first LCD TV I've pulled apart I've repaired a few digibox power supplies, but just obvious faults.]

The easiest way is to look up the part number of any three or four terminal devices, particularly those close to capacitors. In many cases the part number includes the output voltage.

PlainBill

[fcda]

Re: Sagem Axium HD-L32 LCD - Horizontal Lines

Thanks Bill.

I think I'm just going to give up on this one Getting access to the boards while the TV is powered on is pretty difficult.