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L'acoustics LA8 Amp module repairs
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jacethebase View Drop Down
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Joined: 23 September 2009
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Points: 5837 		Post Options Post Options   Thanks (0) Thanks(0)   Quote jacethebase Quote  Post ReplyReply Direct Link To This Post Posted: 11 March 2025 at 10:43am
Originally posted by brokenjoe brokenjoe wrote:

i have already bought replacements, they are about £400 each.. and will soon be obsolete

hence having so many of them on the shelf.. always CH4 next to the fan

The ribbon cable is easily swapped from module to module, so if you have spare ch1, you could just swap the cable from the broken one and it'll no issues 

Have you started buying to to LA12X yet Joe?
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Points: 3736 		Post Options Post Options   Thanks (0) Thanks(0)   Quote brokenjoe Quote  Post ReplyReply Direct Link To This Post Posted: 11 March 2025 at 10:54am
Originally posted by jacethebase jacethebase wrote:

Originally posted by brokenjoe brokenjoe wrote:

i have already bought replacements, they are about £400 each.. and will soon be obsolete

hence having so many of them on the shelf.. always CH4 next to the fan

The ribbon cable is easily swapped from module to module, so if you have spare ch1, you could just swap the cable from the broken one and it'll no issues 

Have you started buying to to LA12X yet Joe?

i have 3 la4x, and waiting on some better prices for 12x .. i don't really have any need for 12x at the minute other than the la8s becoming old.. 

i only found out that the la4x and 12x are powersoft last week, after replacing an encoder
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voron View Drop Down
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Points: 172 		Post Options Post Options   Thanks (0) Thanks(0)   Quote voron Quote  Post ReplyReply Direct Link To This Post Posted: 11 March 2025 at 5:32pm
Beware of fake la4x, the chinese make amplifiers that can work with the original la-network software
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Cue Peter View Drop Down
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Points: 3 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Cue Peter Quote  Post ReplyReply Direct Link To This Post Posted: 10 February 2026 at 10:00am
Originally posted by voron voron wrote:

I have a lot of skills of repair LA8 output amp modules and PSU, even in it have burned MCU's...but I'm located in Russia:)

Hello Voron, I don't suppose you would know why an LA8 has 4V on the 5V rail and no +15V/-15V ? Just received one for repair and customer said it worked for a while when power cycling a few times which sounds like a capacitor(s) problem but so far can't find any that look iffy. 
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VECTORDJ View Drop Down
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Points: 585 		Post Options Post Options   Thanks (0) Thanks(0)   Quote VECTORDJ Quote  Post ReplyReply Direct Link To This Post Posted: 10 February 2026 at 12:48pm
D CLASS  =  FRAUD
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voron View Drop Down
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Points: 172 		Post Options Post Options   Thanks (0) Thanks(0)   Quote voron Quote  Post ReplyReply Direct Link To This Post Posted: 10 February 2026 at 12:53pm
Are you missing +-15V on just one output module or all of them? If it's just one, check the zener diodes on these power rails and the small chokes nearby. If there's no +-15V on all channels, check the main power supply.

Edited by voron - 10 February 2026 at 12:54pm
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Cue Peter View Drop Down
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Points: 3 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Cue Peter Quote  Post ReplyReply Direct Link To This Post Posted: 10 February 2026 at 1:10pm
Thanks a bunch for reacting, much appreciated! It turns out the psu was working just fine when tested outside the unit. I have meanwhile traced the fault to the dsp board (the one connected to the front display). When popping another in from a different LA8 the machine starts up as it should. 
Now that I have that one out I can see there have been made repairs on it already. Weird that it would mess up the power supply that much, but at least I am making progress here. 
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FOO View Drop Down
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Joined: 23 December 2018
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Points: 952 		Post Options Post Options   Thanks (0) Thanks(0)   Quote FOO Quote  Post ReplyReply Direct Link To This Post Posted: 10 February 2026 at 1:11pm
Originally posted by VECTORDJ VECTORDJ wrote:

D CLASS  =  FRAUD

Please stop these childish outburst.. 

We get it.. You can't afford Touring Grade gear, so you bash it to feel better about yourself Ermm


Edited by FOO - 10 February 2026 at 1:12pm
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voron View Drop Down
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Points: 172 		Post Options Post Options   Thanks (0) Thanks(0)   Quote voron Quote  Post ReplyReply Direct Link To This Post Posted: 10 February 2026 at 1:14pm
If the Actel FPGA on the DSP board is faulty, it will not be possible to perform repairs at the component level and the entire DSP board will need to be replaced.
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Cue Peter View Drop Down
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Points: 3 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Cue Peter Quote  Post ReplyReply Direct Link To This Post Posted: 10 February 2026 at 1:22pm
Yeah I think I found the culprit. 
Can't post a picture of it but a capacitor next to Y2 (C63) seems burnt out. 
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josaudio View Drop Down
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Points: 1 		Post Options Post Options   Thanks (0) Thanks(0)   Quote josaudio Quote  Post ReplyReply Direct Link To This Post Posted: 13 March 2026 at 11:39am
I have many PSU and CH3 or CH4 damaged, is it possible to fix them?
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voron View Drop Down
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Points: 172 		Post Options Post Options   Thanks (0) Thanks(0)   Quote voron Quote  Post ReplyReply Direct Link To This Post Posted: 13 March 2026 at 11:48am
Yes. I can repair both power supplies and output amplifier modules. The main problem is that I'm located in Russia, and there are difficulties with both shipping the equipment and paying for my work.
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