(Topic ID: 299507)

WH2O Topper

By rvermeire

2 years ago


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  • 14 posts
  • 4 Pinsiders participating
  • Latest reply 2 years ago by rvermeire
  • Topic is favorited by 1 Pinsider

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Chase1 (resized).jpg
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A-15761ChaseLampBoard measure (resized).jpg

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#2 2 years ago

On J104 or J105 is a connector with 2x WHT-RED wires, unplug this one.

When fuse F111 doesn't blow after this, the problem is likely on the chaser-board for the topper.
This chaser board has 2 bridge rectifiers. Check them first.

#4 2 years ago
Quoted from rvermeire:

Is there trick to test these rectifiers as well

Yes, but there is a tricky part here because on this board there are 2 bridge rectifiers partly in parallel (marked green and cyan in picture)

A-15761ChaseLampBoard measure (resized).jpgA-15761ChaseLampBoard measure (resized).jpg

That means that when there is a short in one of those marked diodes, you can't be for sure if it is BR1 or BR2 having a short.
In that case you could replace them both as they are same age and it is a matter of time that the other bridge will fail as well.

To measure, take out the board, set multimeter to diode/buzz,
- put BLK-lead on (+) of bridge BR1, then with RED-lead measure both (~) terminals.
- put RED-lead on (-) of bridge BR1, then with BLK-lead measure both (~) terminals.
Expect a reading of about 450 mV in display or in case of a short close to 0 mV

Next do BR.2 , BLK-lead on (+) ....etc

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#10 2 years ago
Quoted from rvermeire:

Guess the beep is not a good sign...?

perfect, you found the short.

Quoted from schudel5:

The higher the voltage and amperage current ratings the better.

agreed on that, as long as it fits on the circuit board, you're good.

1 week later
#13 2 years ago
Quoted from rvermeire:

Which BR is controlling which row?

Can't be too difficult to see as this is a simple circuit.

Check the bridge rectifier that it is installed the correct way and check solder for good flow on both sides of the PCB.

Chase1 (resized).jpgChase1 (resized).jpg

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