Huawei HG256

[ant3202]

This device died suddenly, no power, etc upon opening up, no bloated caps or obvious burnt marks.... therefore would need advice where to start troubleshooting, the configuration inside was important to refer back.







Adapter were tested, 12.3V
Tested with another Adapter, but no Go....

much appreciate for the input given.

[ant3202]

Re: Huawei HG256

Update, very Dim Lights seen after doing a capacitor recap....

[kc8adu]

Re: Huawei HG256

i see 4 dc-dc sections.and possibly several linear regs.time to measure....

[ant3202]

Re: Huawei HG256

hmm... any headstart where I should begin?
not very sure to check the components... e.g ... which pin to which?

[joshnz]

Re: Huawei HG256

how does the input from the power supply look. normal voltage?

[ant3202]

Re: Huawei HG256

12.1V in DC Socket
USB 5.01V on the slot

[momaka]

Re: Huawei HG256

i see 4 dc-dc sections.and possibly several linear regs.time to measure....

^ what he said. Basically, on each of those 4 round inductors, check the voltage between the wire on one side and ground. See what voltages you get and post them here. There is also one transistor near one of the coils (lower right side of first picture).

Also touch stuff with your finger while the power is applied and see if anything gets hot.

[ant3202]

Re: Huawei HG256

yep.... just warm... ard 11.9V to 12.1V on some areas..

btw update... seems the FLASH had died....
used a TTL to serial and ..... no response
thanks for the help...