Panasonic SC-HTB10 repairs.


Ugh … soundbars. No. Not for me. A good amp and audio system, why not? However the considered an amp and audio system positioned in a tiny enclosure to place beneath your telly, to enhance the (often) woefully insufficient audio system in a flat display screen … anyway … rant over.

That is the Panasonic SC-HTB10 sound bar. It belongs to a colleague.

“It simply clicks. Are you able to take a look?”
Yeah , why not…
Dis-assembly entails removing of the myriad of screws from the again, there are four hidden beneath rubber bungs on the corners. The again matches actually tightly, I wanted to softly pry it free utilizing a “spudger” (a kind of low cost plastic instruments you get for taking cell phones aside).

Electronic Repairing

 That is the one time I’ve ever needed to take a photograph of a chunk of package in panorama mode!

You will have to disconnect the sub-woofer which is within the again…

Electronic Repairing   Neat tuning port!

Unplug the opposite two speaker plugs (blue and white, simply by the inexperienced circuit board)

You must now be capable of raise the electronics clear from the case.

Now, I will simply draw your consideration to the disclaimer up there on the fitting of the webpage. Yep, that one. I am doing that, as a result of this one caught me out a bit. Underneath the pressed metal defend is the ability provide (really two provides). Due to the signs, my guess was it was failing to begin up. I fastidiously eliminated the defend and eliminated the provision.

Electronic Repairing

Now, we will see there are two switched mode provides. There is a small switched mode transformer above the date code, and a bigger one under.

The small energy provide provides the micro-processor and management electronics. It is at all times on, so the distant is stored powered. This gave the impression to be functioning accurately.

The bigger energy provide, and the parts within the space marked “HOT” are used to produce the amplifiers, That is the place the fault lay. Although this provide had been disconnected for a lot of minutes, the massive electrolytic nonetheless held a powerful 300V DC. While I averted getting a shock, I used to be stunned to search out this cost nonetheless remained. Having safely discharged the cap with a watty 10Okay resistor, I began a couple of checks. See how dis-coloured the board is across the switched mode controller and chopper IC 5701? Factor’s have been working HOT! (The HOT marking on the board is to warn you that this a part of the ability provide is related to dwell mains, and isn’t remoted! Not the temperature of the electronics!) Poor previous C5726 had suffered in consequence. It is ESR had risen to about 25 ohms… far an excessive amount of for this capacitor to be in any well being. A alternative was fitted and restored operation!

One other piece of drugs saved from landfill 

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