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Goodwill Instek digital oscilloscope
Goodwill Instek digital oscilloscope
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Old 1st June 2018, 10:35 AM   #1
hooman is offline hooman  Iran
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Default Goodwill Instek digital oscilloscope

if you are in repair amp or tray to build nice amp and other like preamp ...you should have good oscope . digital oscilloscope can help see and studying on signal .we inject signal to input and see result on small color tft.
after buy new one you need time to learn how it works and how protect this oscop ?
i used gds-122 frome goodwill instek. 6 weeks before when i pushed power key ...i heard noise from inside and became hot
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Last edited by hooman; 4th June 2018 at 05:16 AM.
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Old 1st June 2018, 11:01 AM   #2
hooman is offline hooman  Iran
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i disconnect battery as fast .
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Old 1st June 2018, 11:28 AM   #3
hooman is offline hooman  Iran
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i found one 8 pin smd mosfet on goodwill oscope pcb.this is output of series regulator circuit .if this mosfet is damaged complete voltage of battery goes to 3.3 vcc line
there is no fuse and zener .


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please look at the circuit for ovp and protect other parts. 16 v zener can protect 12 v lin .
for saving 3.3 v ve can use 4.1 v zener .
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Old 1st June 2018, 12:20 PM   #4
hooman is offline hooman  Iran
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suppose you have transistor radio with battery power.if output transistor damage and no sound in speaker .there is one question.how transistor was damaged?
quality of transistor ....?
kind of music?
kind of battery?
life of transistor ?
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Old 5th June 2018, 07:11 AM   #5
Mooly is offline Mooly  United Kingdom
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Goodwill Instek digital oscilloscope


hooman you have reported this thread five time now. The title has been changed from goodwill instek digital scope to Goodwill Instek digital oscilloscope as you asked.
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Old 5th June 2018, 09:07 AM   #6
hooman is offline hooman  Iran
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Quote:
Originally Posted by Mooly View Post


hooman you have reported this thread five time now. The title has been changed from goodwill instek digital scope to Goodwill Instek digital oscilloscope as you asked.
thanks ....
yes i asked for changing title .thanks
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Old 6th June 2018, 05:39 AM   #7
hooman is offline hooman  Iran
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goodwill used in gds-122 fpga ic from exlinx.
Spartan-6 FPGA DC Characteristics
89
Spartan-6 FPGA Data Sheet:
DC and Switching Characteristics

VCCINT Internal supply voltage relative to GND 0.5 to 1.32 V
VCCAUX Auxiliary supply voltage relative to GND 0.5 to 3.75 V
VCCO Output drivers supply voltage relative to GND 0.5 to 3.75 V
VBATT Key memory battery backup supply (LX75, LX75T, LX100, LX100T, LX150, and LX150T only) 0.5 to 4.05 V
VFS



after shorting mosfet in series regulator .... 7.5 v of battery damaged the fpga ic .....and getting hot very quickly.
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Old 11th June 2018, 12:41 AM   #8
1audio is offline 1audio  United States
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Goodwill Instek digital oscilloscope
Its toast and replacing it will be a major challenge without the special equipment needed.
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Old 17th June 2018, 03:02 AM   #9
hooman is offline hooman  Iran
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Quote:
Originally Posted by 1audio View Post
Its toast and replacing it will be a major challenge without the special equipment needed.
thanks for replay but i am working in sony service and can replace this kind ic simply but good will never answer to me .i send this oscop to goodwill service center in my country .they can just changing battery
repair by component is true service .
there is risk for digital oscope after warranty period if buy from company like goodwill.
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Old 28th June 2018, 12:29 PM   #10
hooman is offline hooman  Iran
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good2.jpg

main board of gds-122 goodwill digital oscop .
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Last edited by hooman; 28th June 2018 at 12:33 PM.
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