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Hello,
My HK amp has a fried capacitor and I can't seem to find a match to replace. I have attached photos, hoping someone could give me some guidance. Thank you in advance.
I see... one of the power amp chip took out part of its circuit traces overheated traces (not yet 100% cooked)
Do you want fix that? 70% this can be done successfully because these amps are all similar... you can compare reference measurements with nearby circuit .
See the 2 little "ceramic caps" are like a signature next to this chip: likely Spk. outputs (not a power feed) because there are repeated pattern.
Beside one or more TDA chips + caps.
For everyone... this is why you don't want to push this OEM amplifier enclosed in the trunk left side with restricted air circulation.
Last edited by CaliBenzDriver; Jul 25, 2022 at 07:47 PM.
I have replaced this amp, don't want to spend too much since it would essentially be a spare. I figured I would give it a shot to repair myself if possible.
Last edited by anglil22; Jul 25, 2022 at 08:04 PM.
I have replaced this amp, don't want to spend too much since it would essentially be a spare. I figured I would give it a shot to repair myself if possible.
What did you replace it with: Identical or aftermarket?
What was wrong with bad channel: SPK shorted near zero from overheated coil insulation? This forced the amp to drive power into a shorted load maximum current + heat
Last edited by CaliBenzDriver; Jul 25, 2022 at 08:14 PM.
Easier said than done...LOL mine are not as clearly marked as yours.... I have attached a photo. Even with my readers on it is tough to make out the numbers. Yes, speaker shorted out. I replace it with identical since I upgraded my sound system and had to use the stock amp to integrate with an aftermarket.
Last edited by anglil22; Jul 25, 2022 at 08:30 PM.
Reason: ADD TEXT
Thanks, yes I tried a quick search and came up empty. I'll zero in on the markings and take it from there. I appreciate all your help! I'll chime in if I find it.
I found a working one on ebay for $240. It might be difficult to find the integrated circuit being sold anywhere. You will likely need to get one from a dead donor.
Maybe you'll get lucky and find someone selling a dead one on ebay.
I saw that one. I'll keep poking around, as mentioned no rush. I was able to decipher the chip, picture attached. Unfortunately, haven't found one so far. Thanks again for your help!
Smd repair is a nice skill to pick up. I recently picked up a nice hot air rework station and tools for my pinball machines. This can not be fixed with just a soldering iron. You need hot air, iron with a needle tip and magnifying lamp and a flux pen.
Chips are in short supply for everything, not just new items. Some for my pinballs are not scheduled to be made for 12 months.
Make sure to try mouser or digikey. Digikey will have a reference if it’s available anywhere.
the cost of the smd rework station and you time and the chip make this not an economic winner. I only repair expensive or out of production items and it made the station worthwhile.
good luck. That little cap is easy to find and the numbers are on them. but the chip will require a deep dive….alibaba if no others found. If they have it, that’s all there is.
Pointy iron and mag glass is what I used to repair smaller ones on a couple tablets. No hot air or flux pen. Granted I am not an electrician and if doing a bunch better ways but it is doable. I found some good instruction videos on doing it.
This is the soldering iron I picked up for doing the jobs
I have checked Moser and DigiKey and came up empty. Hopefully when chips become more readily available I will have some luck. Fortunately, not in a rush here.
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