Hi , after changing many capacitors that were leaking on the power
supply board , cannot turn on the television.

Power LED is blinking.

Can these 2200uF capacitors damaged something else on the board ?

Tks...

On Mon, 24 Jan 2011 10:57:29 -0800 (PST), benitos
wrote:

Hi , after changing many capacitors that were leaking on the power
supply board , cannot turn on the television.

Power LED is blinking.

Can these 2200uF capacitors damaged something else on the board ?

Just barely, and only over a fairly long time period (months). There
are many different types of electrolyte. Some are mild acids, but
most are water or alcohol based.
http://en.wikipedia.org/wiki/Electrolytic_capacitor#Electrolyte
Just clean up the mess, replace the big caps (even if they haven't
blown up yet), and be done with it. If you have an ESR tester, it
might help identify which caps are the likely culprits.

Mo
http://www.badcaps.net/forum/showthread.php?s=f467f8a95fa3c34842bd4bbc39d50a2e& t=13045


--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

On 2011-01-24 20:40:46 +0100, Jeff Liebermann said:

On Mon, 24 Jan 2011 10:57:29 -0800 (PST), benitos
wrote:

Hi , after changing many capacitors that were leaking on the power
supply board , cannot turn on the television.

Power LED is blinking.

Can these 2200uF capacitors damaged something else on the board ?

Just barely, and only over a fairly long time period (months). There
are many different types of electrolyte. Some are mild acids, but
most are water or alcohol based.
http://en.wikipedia.org/wiki/Electrolytic_capacitor#Electrolyte
Just clean up the mess, replace the big caps (even if they haven't
blown up yet), and be done with it. If you have an ESR tester, it
might help identify which caps are the likely culprits.

Mo
http://www.badcaps.net/forum/showthread.php?s=f467f8a95fa3c34842bd4bbc39d50a2e& t=13045

here

is an esr meter repository to choose from a schematic to build your own
esr meter !

http://kripton2035.free.fr/esr-repository.html

have a look.
regards,

--
---
Kripton

Kripton

is an esr meter repository to choose from a schematic to build your own
esr meter !

http://kripton2035.free.fr/esr-repository.html


** Anyone who needs to check the ESR of a few electros can lash up a test
rig in seconds - all you need is a bench audio generator and a basic scope
or CRO as poms and Aussies like to call them.

Set the audio gen to about 100kHz and connect the output across the electro
under test - then connect the scope probes direct to the same cap ( not the
generator). You should see a small voltage at 100kHz on the scope.

By comparison with known good electros of similar ratings, one can note the
residual voltages and determine if a given electro is OK.

Tests can be done while the electro caps are still in circuit - but be
careful to make sure they are fully discharged first !!!



...... Phil

Set the audio gen to about 100kHz and connect the output
across the electro under test -- then connect the scope probes
directly to the same cap (not the generator). You should see a
small voltage at 100kHz on the scope.

If one takes that literally, the scope probes /will/ be connected directly
to the generator.

Did you leave something out?

On 1/24/2011 6:40 PM, William Sommerwerck wrote:
Set the audio gen to about 100kHz and connect the output
across the electro under test -- then connect the scope probes
directly to the same cap (not the generator). You should see a
small voltage at 100kHz on the scope.

If one takes that literally, the scope probes /will/ be connected directly
to the generator.

Did you leave something out?



Nope, it IS connected directly to the generator.
And the capacitor across both.

You see a reduced value of signal due to the ESR of the capacitor
vs the source impedance of the signal generator.

Pretty simple.

Not direct reading, but accurate comparison.

Jeff

** Anyone who needs to check the ESR of a few electros can lash up a test
rig in seconds - all you need is a bench audio generator and a basic scope
or CRO as poms and Aussies call them.

Set the audio gen to about 100kHz (sine wave) use full level and connect
the output across the electro under test - then connect the scope probes
direct to the same cap, not the generator - this is important.

You should see a small voltage at 100kHz on the scope - say 2 to 100mV rms.

By comparison with known good electros of similar ratings, one can note the
residual voltages and determine if a given electro is OK.

If you put a 1 ohm test load on the audio gen - you can easily find the
output current and then use the voltage readings on the scope to get actual
ESR values for electros.

Tests can be done while caps are still in circuit - but be careful to make
sure they are fully discharged first !!!


..... Phil

On Tue, 25 Jan 2011 14:58:37 +1100, Phil Allison wrote:


** Anyone who needs to check the ESR of a few electros can lash up a
test
rig in seconds - all you need is a bench audio generator and a basic
scope or CRO as poms and Aussies call them.

Set the audio gen to about 100kHz

My Leader audio generator doesn't do 100kHz. What 'audio generator' does?



--
Live Fast, Die Young and Leave a Pretty Corpse