Deedeelabricolade
New Member
Last Activity: 03-20-2025, 04:08 AM
Joined: 08-12-2022
Location: Saxon
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Small update. All channels are now muted. I tested the headphone jack and I can clearly hear the output relays clicking. No sound in the headphones either. As advised, I unsoldered, cleaned and resoldered the STK. It has 30V and -30V VCC supply. All ICs seem to produce the correct voltages according to datasheet. The only thing that seems weird to me, on Q751 I have -9mV 27mV 680mV (EBC), Q706 -8mV 75mV 770mV and on Q810 1,5mV 6mV -10mV. Pretty small but I've no idea what they are for. Thanks for your time! -
Thank you so much for those infos, I can start digging with confidence now. As seen in the user manual, factory reset is available via scart and as this unit was used only to listen to music, I didn't check if the video was working. Btw, pretty sure I don't have any screen nor cable to check (and the remote is missing). Is that really important ?
Thank you again for your time and these golden tips !
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JVC TH A35 Home cinema repair, only sub and center channel working
So I have this home cinema with only the subwoofer and the central speaker working. The unit boots up with blue light, so no protection mode nor short detected. All fonctions are available (radio, cd, aux etc...).
I have the schematic of it but no idea what to look at and how. Seems that the sub and center speaker are both connected to the same relay but I don't get how the 3 other have failed as they are all powered from the same supply? How can I diagnose it safely? -
Re: Exploded component on a conga 990 vacuum motherboard
OMG that's it ! Thank you so much ! May I ask you how you find it ?
I have a hot air station, will need some training tho but It's doable.
Thank you again, you made my day already...Leave a comment:
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Re: Exploded component on a conga 990 vacuum motherboard
Very interesting comment, thank you!
I did try to remove the coating, white spirit, isopropyl, still nothing visible on it due to the implosion. My last attempt was to desolder it but I fail miserably and the bloody thing falls apart in pieces. Instant regret.
Indeed it seems to be like a H-bridge. After probing, one side goes to the processor through resistors and the other comes from power supply.
Further in my research, I did find another picture of a look-alike...Leave a comment:
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Re: Exploded component on a conga 990 vacuum motherboard
Just to be perfectly clear it's the U4 component above the two R100 resistors.
Nothing's visible on it except the hole and it did break when I tried to desolder so no more chance to read anything
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Re: Exploded component on a conga 990 vacuum motherboard
Thanks for your input, I already try my best but the crater in the chip doesn't really help...
Sadly this chip seems to be unique on this board and I tried to find another motherboard-like picture online to compare to, but found nothing.
Will my last hope be guessing what it is ?Leave a comment:
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Exploded component on a conga 990 vacuum motherboard
Hello all,
Very common problem but i can't do anything without knowing what that component is and what he is doing?
The vacuum automatically turn the brushes endlessly when battery is plugged in, nothing else. Weird behavior. The plug on the right is the battery in, 14.4V, 2.6Ah.
I'm pretty sure the chip fuck everything up, can somebody help me to identify it?... -
Re: New Members - please post your introductions here
Hi everyone ! I'm new to electronics and for sure this forum will help me acquire the required wisdom and knowledge.
I have a hobby repair workshop since couple years and more and more I receive stuff full of eletronics and I want to get better at diagnosing what gone wrong and hopefully why.Leave a comment:
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