White screen

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rfredel
Posts: 5
Joined: Wed Jul 11, 2018 8:50 pm
Location: 53117 Bonn; Estermannstr.124; Germany
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White screen

Post by rfredel »

A few weeks ago I bought 2 kits DS0138 from Banggood.
After assembly, both worked flawlessly. After 2 days, the 1st kit did not work anymore. It only showed a white screen. The green LED does not show anything anymore.
The voltage + 3.3V showed only 0.8V and all other voltages were too low. The current consumption is 0.5A at 9V.
The voltage regulators U5 and U3 are getting very hot.
The + 3.3V seems to have a short circuit. Capacitors C22 and C26 are OK.
After opening J4, the short circuit no longer exists.

Thanks in advance for your help
Best regards
Rainer Fredel
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jye1
Posts: 1221
Joined: Wed Feb 20, 2013 4:58 pm

Re: White screen

Post by jye1 »

Did you see U1 hot too?
rfredel
Posts: 5
Joined: Wed Jul 11, 2018 8:50 pm
Location: 53117 Bonn; Estermannstr.124; Germany
Contact:

Re: White screen

Post by rfredel »

Hello yve1,
thank you fo your replay.
Yes, U1 will be hot also,

Best regards
Rainer
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