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DELL 1708FPt LCD Monitor Shutdown Problem Repaired

By Jestine Yong on August 8, 2015

The complaint was display shutdown after few seconds. This is the PCB of the combined Inverter and Power circuit or IP board.

As you can see above, there are 5 bulged e-caps. I changed all the e-caps. I continued to check the ESR value of other e-caps and found all of them were good. I also have checked for short parts in the circuit with my DMM and checked the HV transformers with my ring tester and all were in good condition.

Once the replacement of parts were done, I powered the Monitor, and see the result below:

I left the monitor “On” for 24 hours and no other problems were discovered. This is considered a simple repair job and you need to know that not all case is so easy but give a try and save the world from technological junk.

This article was prepared for you by Christian Robert Adzic from Novi Knezevac-Serbia.

Please give a support by clicking on the social buttons below. Your feedback on the post is welcome. Please leave it in the comments.

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Note: You can check his previous post in the below link:

https://www.jestineyong.com/laptop-keyboard-repair/

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LCD Monitor repair

12 Comments

Anwar Shiekh

August 8, 2015 at 9:49 pm

Perhaps you have a recommendation on which low ESR capacitors you prefer.

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- Chris
  
  August 11, 2015 at 6:41 pm
  
  Thanks for supporting my article.
  Sorry, but I really don't know now day what should I prefer.
  I tried out a bunch of caps from various manufacture and I can say sometime one was better then other and vice versa.
  I think, today the manufacturers of the caps all make mistake and no one can promise the quality.
  This is only from my side, maybe I'm wrong..
  
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Robert Calk

August 9, 2015 at 12:18 am

Good job, Chris. Thanks for the article.

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Yogesh Panchal

August 9, 2015 at 1:19 am

congratilations for quick fix.

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Albert

August 9, 2015 at 2:34 am

Its always the Electrolyte Caps that breakdown. A Coil normally never breaks or gets faulty. A Capacitor resist against changing any Voltage level. A Coil resist against change of current. Current and Voltage are out of Phase with Capacitor or Coil. If we could live without those Bad Capacitors suppose them having the quality of Coils, SMPS Power Supplies and other Devices never would Fail as often! For instance a Capacitor that became hotter than the about 85 Degrees Celsius maximum temperature as written on the Cap has left a reduced life expectancy of 50% less afterwards! Coils never dry out. Caps do apparently.

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Mark

August 9, 2015 at 2:37 pm

Hey Christian,

As you said, not all repairs are complex, but are worth the effort just to save them from landfill or recycling deconstruction.

I get a real buzz from going to the rubbish tip, finding something that someone deemed 'rubbish', getting it up and running and then seeing it being put to use again.

It's obvious I have simple tastes in life 🙂

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Henrique Jorge Guimarães Ulbrich - Brazil

August 11, 2015 at 5:35 am

I deal with electronics since 1964. Even at that time, the electrolytic capacitors were largely used, much of the gadgets being analog and with tubes but in transistor gadgets too, and further with ICs and digital systems. However, the e-caps did not show so many problems at that time. What happened? Why the quality fell so much? The normal industrial practice should be to improve the quality, but what we observe is a noticeable deterioration of this type of component. Could anyone explain what happens?

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- Albert
  
  August 11, 2015 at 2:42 pm
  
  Hi Henrique Jorge Guimarães, I'm no expert in answering your observation on the deterioration of E-caps. But I read somewhere that a decennia or so back in time the manufaturer of these Electrolyte Capacitors got in big trouble because they lost the correct formula of the Electrolyte substance when one of their important employees left the Firm and with the exact formula. So as a result they made E-Caps with faulty substances that caused bad exploding Capacitors on several Desktop Mainboards. And those Mainboard manufacturers (I shall not name them here, but on the internet they can be found) got known for their Failing Capacitors. (Mainboard E-Caps are mostly very low ESR types at about 6.3 Volt maximum working Voltage). So that could explain what happened?
  
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Chris

August 11, 2015 at 10:33 pm

Please all folks take you a bit of time, take a drink, cafe, soda, seat back and watch this movie. https://www.youtube.com/watch?v=vfbbF3oxf-E
I think this is the key for all our questions...
I hope you enjoy this.

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- Robert Calk
  
  August 13, 2015 at 11:56 am
  
  You are right, Chris. I enjoyed the video on planned obsolescence. Thanks.
  
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- Albert
  
  August 13, 2015 at 4:02 pm
  
  Thanks Chris for this information! I have watched it. I always suspected this waste policy, and also heard rumours about this happening. I used to have an Epson Stylus 600 printer that went broken only after 13 months (dried out internal printerhead). No guarantee in those days left and about 799 guldens thrown away. And no answer from Epson at all either! So I never buy Epson again. (My Brother DCP-385C is 1000 times better! But sadly this type and model can't be bought anymore).
  
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Humberto

August 13, 2015 at 1:53 am

Hi Chris, good article. Simple repair but remember only two things: good attempt and another device saved from the dump.

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