Author Topic: RG300 no longer boots  (Read 369 times)

Jindofox (OP)

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  • Posts: 11
RG300 no longer boots
« on: August 13, 2019, 12:59:25 am »
My brand new RG300 was working great until I gave it a charge using the supplied USB-C cable. Now it won't start at all, it stays completely dark. I've reached out to the seller, and reseated the SDcard and battery. Any other ideas of things to try?

quadjfet

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  • Posts: 66
Re: RG300 no longer boots
« Reply #1 on: August 13, 2019, 01:27:27 am »
What do you have available as far as EE test equipment? Multimeter? Oscilloscope?

Personally I'd take the PCB out of the case, leave the battery unconnected, and plug in a USB-C cable into one of these: https://www.aliexpress.com/i/32960021255.html so I could watch the current. Then I'd turn the power switch on, glance at what the little meter says to make sure it's not shorted out, then start tracing the power architecture. If voltages look good I'd check the crystal oscillators, if those are good too I'd check for UART traffic.

If the power LED doesn't come on at all, that's kinda bad news, and likely to be a power fault somewhere. (The power LED is on the back side of the device, top right corner FYI) It would line up with your description of the problem as starting immediately after a charge cycle.

ADY

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  • Posts: 104
Re: RG300 no longer boots
« Reply #2 on: August 13, 2019, 05:29:53 am »
My RS-97 had a similar problem when I first got it, I left it on the charger all night and it worked again. Worth a try.

sirdrak

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Re: RG300 no longer boots
« Reply #3 on: August 13, 2019, 12:11:31 pm »
I have a similar problem with the RG300 that i received yesterday... It was working ok and i was testing some games on FBA when suddenly the RG300 turned off. I thought that the battery probably was empty (i was testing the RG300 straight out of the box), so i conected it to the power. When the led was green and the battery was charged, i tried to turn on the console but the screen remained off. The led was on and green, so i think that the problem is with the screen.

quadjfet

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  • Posts: 66
Re: RG300 no longer boots
« Reply #4 on: August 13, 2019, 09:54:33 pm »
Sirdrak, Jindofox:

If you have a voltmeter, you could try checking the battery voltage. These are not actual "BP-5L" standard batteries, so the quality is a bit questionable. Here's a quick guide for the most common lithium-ion chemistry (LiCoO2), it's a bit over-simplified but should work:

Single cell LiCoO2

> 4.3 V            =      Something is horribly wrong. It's a fire hazard, safely dispose of it.

4.0 - 4.2 V        =      Fully charged
3.8 - 4.0 V        =      Mostly charged
3.6 - 3.8 V        =      Medium charge
3.4 - 3.6 V        =      Low charge
3.0 - 3.3 V        =      Empty of useful energy

0 - 2.7V            =     Something is horribly wrong. It's a fire hazard, safely dispose of it.

Exactly 0V          =  It's likely the protection circuitry activated. Undervoltage Protection (UVPO) is designed to open-circuit the battery if the voltage drops too low. It usually kicks in at 3.3V - 2.7V, depending on how aggressive the manufacturer tuned it. It might come back to life if you put it back on the charger, but you still might want to do the initial charge outside in a metal box, or at least keep it supervised during charging.

https://en.wikipedia.org/wiki/Lithium_cobalt_oxide
https://batteryuniversity.com/index.php/learn/article/types_of_lithium_ion
Random cheap multimeter: https://www.aliexpress.com/item/32963956708.html
« Last Edit: August 14, 2019, 02:46:34 am by quadjfet »