English Amiga Board Amiga Lore


Go Back   English Amiga Board > Support > support.Hardware

 
 
Thread Tools
Old 04 August 2009, 15:23   #1
Loedown
Precious & fragile things

 
Join Date: Feb 2009
Location: Victoria, Australia
Posts: 1,916
Importance Of Capacitor Replacement

Greetings,
I've just had a HP LCD apart on the kitchen table, much to the disgust of my wife, I would use my normal workbench, but it's covered in other stuff needing my attention.

With LCD monitors, the most common problems are heat related, almost always the power supply gets damned hot, PCB actually changes colour, so the usual problems are dry joints, mainly on the main transformer and similar, so I resoldered all the likely suspect joints and no joy. Then I got a bit more adventurous and actually pulled the power supply out and turned it over, to find six very bulging capacitors. All of them being 1000uF @ 16V, replaced all six, monitor comes to life.

Moral of this story, always use 105 degrees caps and if no power from a power supply, main chopper transistor isn't shorted and main bridge isn't short circuited, replace all low voltage caps in secondary side of power supply, won't work every time, but most times it will.

Paul
Loedown is offline  
AdSense AdSense  
Old 04 August 2009, 17:23   #2
Zetr0
Ya' like it Retr0?
Zetr0's Avatar
 
Join Date: Jul 2005
Location: United Kingdom
Age: 39
Posts: 9,265
Great stuff there m8

now where them pics?
Zetr0 is offline  
Old 05 August 2009, 00:24   #3
Loedown
Precious & fragile things

 
Join Date: Feb 2009
Location: Victoria, Australia
Posts: 1,916
[Link deleted - Graham]

Consider yourself zoned

Paul

Last edited by Graham Humphrey; 05 August 2009 at 10:09.
Loedown is offline  
Old 05 August 2009, 00:35   #4
kriz
Junior Member
kriz's Avatar
 
Join Date: Sep 2001
Location: No(R)Way
Age: 32
Posts: 2,231
Ahh nice work!
kriz is offline  
Old 05 August 2009, 01:17   #5
Firthy2002
Never played on an Atari!
Firthy2002's Avatar
 
Join Date: Sep 2004
Location: Leeds, England
Age: 31
Posts: 258
Send a message via ICQ to Firthy2002 Send a message via AIM to Firthy2002 Send a message via MSN to Firthy2002 Send a message via Yahoo to Firthy2002 Send a message via Skype™ to Firthy2002
Is it a cheap monitor?
Firthy2002 is offline  
Old 05 August 2009, 01:20   #6
prowler
Global Moderator

prowler's Avatar
 
Join Date: Aug 2008
Location: Sidcup, England
Posts: 9,681
It isn't now.
prowler is offline  
Old 05 August 2009, 01:25   #7
Zetr0
Ya' like it Retr0?
Zetr0's Avatar
 
Join Date: Jul 2005
Location: United Kingdom
Age: 39
Posts: 9,265
Quote:
Originally Posted by Loedown View Post
[Link deleted - Graham]

Consider yourself zoned

Paul
LMAO!!!!!


indeed!!!!

Last edited by Graham Humphrey; 05 August 2009 at 10:10.
Zetr0 is offline  
Old 05 August 2009, 01:43   #8
Photon
Moderator
Photon's Avatar
 
Join Date: Nov 2004
Location: Hult / Sweden
Age: 100
Posts: 4,036
Well, all consumer electronics need service. And not all manufacturers heed their engineers' advice to spend money in the right place. And not all asian manufacturers have top engineers. That's an assumption lesser than the one before, though.

So. Good job, now check your other electronic gear Especially analog stuff made after the 80s need attention, like transformers/ac-dc adapters. Only a few of them pass muster, most of them from Japan and Germany.

Watch out for rebranded stuff made in the third world, like "OBH Nordica" etc, I had quite a shock when I opened one of their products... sub-1960s technology...
Photon is offline  
Old 05 August 2009, 01:51   #9
FOL
PSPUAE DEV

FOL's Avatar
 
Join Date: Nov 2006
Location: Wales
Age: 36
Posts: 4,750
Send a message via MSN to FOL Send a message via Skype™ to FOL
Quote:
Originally Posted by Loedown View Post
Greetings,
I've just had a HP LCD apart on the kitchen table, much to the disgust of my wife, I would use my normal workbench, but it's covered in other stuff needing my attention.

With LCD monitors, the most common problems are heat related, almost always the power supply gets damned hot, PCB actually changes colour, so the usual problems are dry joints, mainly on the main transformer and similar, so I resoldered all the likely suspect joints and no joy. Then I got a bit more adventurous and actually pulled the power supply out and turned it over, to find six very bulging capacitors. All of them being 1000uF @ 16V, replaced all six, monitor comes to life.

Moral of this story, always use 105 degrees caps and if no power from a power supply, main chopper transistor isn't shorted and main bridge isn't short circuited, replace all low voltage caps in secondary side of power supply, won't work every time, but most times it will.

Paul
Indeed, this was the most common fault I would come across. Monitor I use now, was a scrapped 1. Only needed new caps and away it goes, .
FOL is offline  
Old 05 August 2009, 02:01   #10
Loedown
Precious & fragile things

 
Join Date: Feb 2009
Location: Victoria, Australia
Posts: 1,916
Quote:
Originally Posted by Firthy2002 View Post
Is it a cheap monitor?
Most likely it was bought as a 'packaged system', it's one of three from the same workplace, I've taken them, fix them and then sell them back again.

@FOL S/H gear is always good to get going, certainly cheaper than buying it at original prices.

@Prowler I'm being nice and only charging $50 / monitor
Loedown is offline  
Old 05 August 2009, 06:53   #11
Loedown
Precious & fragile things

 
Join Date: Feb 2009
Location: Victoria, Australia
Posts: 1,916
Greetings,
All three monitors, all with bad caps, open and shut ( with some soldering ) case.

Paul
Loedown is offline  
Old 05 August 2009, 07:41   #12
kriz
Junior Member
kriz's Avatar
 
Join Date: Sep 2001
Location: No(R)Way
Age: 32
Posts: 2,231
Its very nice fixing these monitors, so many more years they will go now!

And you also make some money from it great !!
kriz is offline  
Old 05 August 2009, 10:11   #13
Graham Humphrey
Moderator
Graham Humphrey's Avatar
 
Join Date: Jul 2004
Location: Norwich, Norfolk, UK
Age: 27
Posts: 10,104
Just a quick reminder to people that no direct linking to files in the Zone is allowed as per the forum rules, thank you.

Carry on, nothing to see here...
Graham Humphrey is offline  
Old 05 August 2009, 10:13   #14
Loedown
Precious & fragile things

 
Join Date: Feb 2009
Location: Victoria, Australia
Posts: 1,916
Quote:
Originally Posted by Graham Humphrey View Post
Just a quick reminder to people that no direct linking to files in the Zone is allowed as per the forum rules, thank you.

Carry on, nothing to see here...
Wasn't aware, I'll behave in future

Paul
Loedown is offline  
Old 05 August 2009, 10:19   #15
Graham Humphrey
Moderator
Graham Humphrey's Avatar
 
Join Date: Jul 2004
Location: Norwich, Norfolk, UK
Age: 27
Posts: 10,104
No worries - as far as rules go it is one of the more obscure ones...
Graham Humphrey is offline  
Old 05 August 2009, 14:36   #16
PWLM
He found it at the zoo..
PWLM's Avatar
 
Join Date: Jun 2008
Location: Townsville / Australia
Posts: 151
Send a message via Skype™ to PWLM
If anyone has an idea about how to pull apart an Acer 19" ws monitor please let me know, I'm sure I have a similar problem (no, not the alcohol-related one) with a bad PSU in the monitor. One day it hissed at me and now cannot even get the power light to... um, light!
PWLM is offline  
Old 05 August 2009, 15:32   #17
Loedown
Precious & fragile things

 
Join Date: Feb 2009
Location: Victoria, Australia
Posts: 1,916
Quote:
Originally Posted by PWLM View Post
If anyone has an idea about how to pull apart an Acer 19" ws monitor please let me know, I'm sure I have a similar problem (no, not the alcohol-related one) with a bad PSU in the monitor. One day it hissed at me and now cannot even get the power light to... um, light!
Find and take out all the screws in the back, then armed with a fine flat blade screw driver, CAREFULY slot apart the front screen bezel and the rear housing, in the case of these HPs, it was 4 screws in the back, then about 12 edge clips. Also note, manufacturers sometimes like to hide screws behind the support plate for the base bracket and alike. The final trick is patience and knowing how far plastic bends before it makes a satisfying snapping noise.

http://acer-lcd-repair-tips.blogspot.com/

That will help too^^

Be adventurous, consider this, if you screw it up, you can buy a new one anyway, if you fix it, hey you saved yourself some dollars.

Above all else, if you're still frightened and live in Australia, PM me, I'll fix it for you.

Paul
Loedown is offline  
AdSense AdSense  
 


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Similar Threads
Thread Thread Starter Forum Replies Last Post
A600 Capacitor Replacement kipper2k support.Hardware 133 06 September 2014 23:48
Capacitor Replacement? lewis_slade support.Hardware 2 07 April 2012 18:38
Capacitor replacement in Australia bobsmith2012 support.Hardware 6 20 September 2010 11:29
A600 Capacitor replacement. Dougal support.Hardware 2 07 January 2010 21:39
Capacitor Replacement Service Loedown support.Hardware 9 03 December 2009 10:04

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +2. The time now is 01:06.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Page generated in 0.19634 seconds with 11 queries