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Akura Retro Phono n BT Player AITVS550 BTRB

Posted: Thu Aug 05, 2021 6:11 pm
by spike1947
Hi have been given a couple of Akura Retro Phono n BT Players and of course they don't work, where do I start to test voltages etc on it, getting 5vdc out of transformer and to the board, the battery is giving out 3.7vdc , don't realy know where to test for any voltages , tried to find a schematic etc for it, but no luck up to now.

On one of them the charging light comes on and a blue ( bluetooth ) led comes on then blinks and I can connect my phone to it, but then after a short time it goes off and only the charging light remains on, but no activity with the turntable motor activating !.
on the other one no lights come on .

IC's as in order left to right as per pic uploaded:
1st: top 28pin, BK3254SS28B
2nd: top 8pin, HT135T
1st: bottom 6pin, B6286T
2nd: bottom 16pin, YD3412

Exectly the same has these ... omparison/


Re: Akura Retro Phono n BT Player AITVS550 BTRB

Posted: Fri Aug 06, 2021 8:17 am
by spike1947
Found the same burnt out chip on both boards .
4054, Standalone Linear Li-Ion Battery Charger with Thermal Regulation in ThinSOT


Re: Akura Retro Phono n BT Player AITVS550 BTRB

Posted: Sun Aug 15, 2021 11:24 am
by David

This is a very difficult job to do, especially if you are not aquainted with dealing with SMDs (Surface Mounted Devices). SMDs are close together on a board, and often very difficult to replace. A schematic is absoutely essential if you are going down to board level, or if you cannot ascertain the value of a faulty component.

You may well have reached the state of "mend it with a new one". Try to find a working board on EBay or similar - that should be cheaper in the long run if you find yourself working for a long time with no results!

Sorry to be a bit of a doubter here.


Re: Akura Retro Phono n BT Player AITVS550 BTRB

Posted: Mon Nov 08, 2021 4:03 pm
by Pico Angstrom
Yes, and, there's also going for the easy stuff.

Do a quick visual looking for burnt, puffy or misaligned components. A fried resistor or capacitor, puffy electrolytic or smd that didn't pick up any solder on one end could be the culprit.

Use a multimeter to check for power in a couple of places.

If you'd like to watch this done in real time, vist YouTube and check out creators Eevblog, Big Clive, Mr. Carlson's lab, Julian Ilet, or shango066.

Have a little fun but, as the previous poster alluded to, discretion is clearly the better part of valor. If nothing easy drops in your lap, fire up your T12 and use those boards for soldering practice :lol: