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PRONET 8 PORT Network Switch Repaired

By Jestine Yong on July 6, 2015

On call of one of my customers I have visited his place on complaint that they are not able to open shared files in any of the computers. They are using 5 nos. of desktop computers in their office. I looked to the switch there was no power LED Indication that means no power. Hence I have checked the power adapter and it had 9V DC output which means good. Now this also means the problem is with the 8 port switch itself. Once the switch was opened I did not see any physical damage or burnt marks on PCB.

Then I have started some troubleshooting with the help of my multimeter. Since there was 9 Vdc so I checked on the surrounding components with diode check range to find out if there is any Open or Short Circuit Components and all components seem to be good.

Next I have to find out if any component gets over heated after applying a voltage. Hence I have connected power adapter and by touching with finger randomly on PCB I found 8 PIN IC 34063A is getting hot.

Now I have unplugged the power adapter and tested the IC with multimeter for short circuit but there is no positive sign of short circuit. Hence I have decided to replace the IC and check. I have arranged the IC from the component shop and replaced in place of suspected IC.

This IC is used for DC-to-DC Converter Control.

Little bit complicated to remove this type of IC on suspect for testing from Multilayer PCB as you see in the photo above I have damaged some pins of the old IC while removing .

Note: Please use Good quality of flux while removing old solder. First apply the flux on solder joint then re solder the joint and then proceed for Desoldering.

After the replacement of IC I have re-plugged the power adapter and Power On, and the LED indicator was glowing. That means the unit is ready for use now.

I have forgotten to take voltages of old IC but I have marked the voltages on above Block diagram with New IC.

This article was prepared for you by Yogesh Panchal who works as a Computer Hardware Engineer in Mumbai India.

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24 Comments

Mubashir

July 6, 2015 at 3:45 pm

Dear Yogesh,

Thanks for a good article on 8 port network switch. I am also doing a little bit work in Electronics and want to need help from you to repair these kind of network switches like Baylan and others. This article is very helpful for me. Voltage marking is very good approach. If you have repaired these kind of switches then plz share with me. I have lots of network switch but still need to repair.

Thanks.

Mubashir

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- Yogesh Panchal
  
  July 8, 2015 at 1:14 am
  
  Mubashir,
  
  I am always there to help, as far as dead power unit is concern you can read Jestine sir's "Power supply Repair" Book this will make you confident for any challenge in repairing.
  
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Albert

July 6, 2015 at 3:53 pm

Very interesting repair Yogesh! Don't worry about not having noted the old 34063 IC Voltages. It was out of order and so did not work anyhow. And you did took the voltages on the replacement working 34063 IC and put them in the Block Diagram.
Thanks.
Albert.

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- Yogesh Panchal
  
  July 8, 2015 at 1:15 am
  
  Albert,
  Thanks for appreciation.
  
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Gerald Millward

July 6, 2015 at 4:26 pm

Hello Yogesh

I recommend that you invest in a low-cost hot air rework station (see ATTEN 858D on eBay for example). You will find this makes removal of multi-leg ICs very simple with no risk of damage if used properly.

best Wishes

Gerry

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- Yogesh Panchal
  
  July 8, 2015 at 1:18 am
  
  Gerald,
  Thanks for suggestion. I am having rework station with me but bit worried about thin traces on PCB.
  
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Humberto

July 6, 2015 at 7:55 pm

Hi Yogesh, good repair.

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- Yogesh Panchal
  
  July 8, 2015 at 1:18 am
  
  Thanks Humberto.
  
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Merlin Marquardt

July 6, 2015 at 7:57 pm

Good repair.

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- Yogesh Panchal
  
  July 8, 2015 at 1:19 am
  
  Merlin thanks for your comment.
  
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Anwar Shiekh

July 6, 2015 at 11:45 pm

It still amazes me how the Chinese are able to produce such units at the prices they do, and doubt I would have got as far as you in replacing the switching regulator chip. Admirable perseverance.

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- Yogesh Panchal
  
  July 8, 2015 at 1:20 am
  
  Anwar saab ,
  
  thanks for your comment.
  
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Robert Calk

July 7, 2015 at 1:16 am

Thanks Yogesh. Good job troubleshooting and repairing the device. You still don't have a de-soldering gun?

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- Yogesh Panchal
  
  July 8, 2015 at 1:25 am
  
  Sir,
  After looking at your wide collection of tools; now i am also preparing for the same i will let you know soon.
  
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  - Robert Calk
    
    July 9, 2015 at 3:47 am
    
    You will be so happy when you get one! A good de-soldering gun saves so much time and makes electronics so much easier.
    
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Vikrant

July 7, 2015 at 1:46 am

Dear Yogesh thanks for sharing this, usually we throw it,due to cheap and china product.and it's really difficult to repair ADSL modems /switches/Routers many repair persons refuses this job due to spares availability.I am reading you from many days and think you are perfect Hardware technician.BEST LUCK keep it up...

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- Yogesh Panchal
  
  July 8, 2015 at 1:32 am
  
  Vikrant,
  
  Instead of filling the land with this type of junk i would rather like to repair and use it because this technology is not absolute yet.
  
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Radhakrishna

July 7, 2015 at 2:52 pm

Thank u Sir, help us many devices repairs ....

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- Yogesh Panchal
  
  July 8, 2015 at 1:32 am
  
  thanks for comment Radhakrishna.
  
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Chris

July 10, 2015 at 2:01 pm

Thank you Yogesh for sharing your knowledge with the rest of the world.
Nice job done, please keep sharing, only so can we save our local environments from techno junk.

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- Yogesh Panchal
  
  July 11, 2015 at 12:52 am
  
  Your welcome Chris.
  
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Ganthan

July 23, 2015 at 12:16 pm

It's really a useful guide. You are giving an excellent support to us.
thank you

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venkatesh

October 30, 2015 at 2:02 pm

Thanks for a good article on 8 port network switch. I am also doing a little bit work in Electronics and want to need help from you to repair these kind of network switches like d link. This article is very helpful for me. Voltage marking is very good approach. If you have repaired these kind of switches then plz share with me. I have lots of network switch but still need to repair.the problem with these switches is in some ports if we plug in the hole network is disturbed.I want to know how can it happen when other ports in the same switch is working.do you have come accros the same problem if so pleas share the trouble shooting tips.

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nawzat

May 4, 2022 at 5:46 pm

hi to all
i have same problem about ip phone planet and planet switch 24 port having same problem(no detecting lan port )
so if you can help me please
with best regards

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