[SOLVED] 820-3115-B Pulsing charger light

[Japtastic]

Wow, thanks for the quick response. Will check in the morning. I'm beat, it's late here.

 

[Japtastic]

Hi, just checked and no resistance at all from those points.

 

[Japtastic]

Thanks for the reply. Unless the donor U7000 is also faulty, no joy with replacement. Back to the same situation. Ticking persisted even with U7000 off the board. C7020 and C7050 don't test as shorted...

 

[2informaticos]

PPBUS_G3H fluctuates?
PP3V42_G3H too?
Post voltages as U7000...

 

[Japtastic]

PPBUS_G3H = 3.6v while pulsing/ticking 11.65v when fan spinning
PP3V42_G3H = 3.45v Constant

U7000:

Pin1 = 16.3v Constant - 0.1-0.2v drop when fan starts
Pin2 = 16.3v Constant - 0.1-0.2v drop when fan starts
Pin3 = 3.9v Constant - 0.1-0.2v drop when fan starts
Pin4 = 3.42v Fan off, 0v Fan Spinning
Pin5 = 0.2v Fan Off, 2.8v Fan Spinning
Pin6 = 3.45 Constant
Pin7 = 0.7v Fan Off, 2.8v Fan Spinning
Pin8 = 0.44 Fan Off 1.63v Fan Spinning
Pin9 = 0.03v Constant
Pin10 = 3.45v Constant - 0.1-0.2v drop when fan starts
Pin11 = 3.45v Constant - 0.1-0.2v drop when fan starts
Pin12 = 3.45v Constant
Pin13 = 3.14v Constant
Pin14 = 2.36v Constant
Pin15 = 0v Fan Off, 0.05v Fan Spinning
Pin16 = 2.8v Fan Off, 10.02v Fan Spinning
Pin17 = 2.8v Fan Off, 10.72v Fan Spinning
Pin18 = 3.5v Fan Off, 11.4v Fan Spinning
Pin19 = 5.02v Constant
Pin20 = 5.02v Fan Off, 4.96v Fan Spinning
Pin21 = 0v Fan Off, 1.22v Fan Spinning
Pin22 = 0v
Pin23 = 3.5v Fluctuation Fan Off 14.6v Fan Spinning
Pin24 = 3.5v Fluctuation Fan Off 16.2v Fan Spinning
Pin25 = 4.53v Fluctuation Fan Off 14.6v Fan Spinning
Pin26 = 14.6v Fan Off, 14.3v Fan Spinning
Pin27 = 0v
Pin28 = 0v

 

[Japtastic]

Sorry, my bad, lack of experience and lack of decent, unbroken sleep meant I ballsed up the terminology.

Pins 27 and 28 have continuity to R7021 and R7022 are correct at 10ohm
Pins 17 and 18 have continuity to R7051 (2.5ohm) and R7052 (0.3ohm)

Any clues on ticking noise?

 

[larossmann]

Yes. Find the broken link in the line.

 

[jason_microsoldering]

https://youtu.be/hpbzO2UjQQA