sony trintron 21" no power up

[eric]

Hello - I checked the power .. there is 120V after the filter and the fuse
is good .--- still nothing happens .. could the switch be bad ?
what could be the next possible component failure ?

thx

 

[Shoreline Electronics]

Ummmmm... a little more info needed :

Model # :
Fcc ID # :

==========================
Jeff Stielau
Shoreline Electronics Repair
[email protected]
==========================
"If you push something hard enough it will fall over."
Fudd's First Law of Opposition - Sir Sidney Fudd

 

[Sofie]

eric:
It is unlikely that the switch is bad..... but if in doubt it is easy enough
to test..... besides, if just the switch were bad you would still be able
to turn the television on and off with the remote control. Does that make
sense to you?
Things for you to check next:
Is standby power getting to the micro?
Is the power relay clicking?
Check the electrolytics near and around the power relay..... usually a 22uf
cap is suspect.
Is the HOT good?
Check solder joints on HOT, Flyback and H Driver Xfmr.
Check for open low-ohm power resistors around power supply and near flyback.
Of course, since you did NOT post the very important model number of your
television, I am only giving you wild guesses..... I know that it is obvious
to you that NOT all "Sony Trinitron 21" televisions have the same components
and are NOT designed the same exact way.
Next time you post for a repair suggestion be certain to provide the MODEL
NUMBER if you are hoping for any specific and halfway accurate replies.

 

[eric]

Hello Daniel and Jeff...

This computer monitor by Sony entitled Trinitron 21 " has a

Model #: CPD-300SFT
and
FCC ID#: AK8GDM20F03

 

[Shoreline Electronics]

Eric,

Check R685 330k 1/4 W .....it may be open.




==========================
Jeff Stielau
Shoreline Electronics Repair
344 East Main Street
Clinton,CT 06413
860-399-1861
860-664-3535 (fax)
[email protected]
========================
"If you push something hard enough it will fall over."
Fudd's First Law of Opposition - Sir Sidney Fudd

 

[eric]

I saw many of the larger resistors .. none were as high as 330K in the 1/4W
range .. I did look a few minutes with a flashlight - I didn't see a
R685 -- it must be in an inconspicuous place ... Any idea of the
coordinates on the board real estate or it's landmark proximity ?

 

[Shoreline Electronics]

I assume it should be in the primary of the SMPS.

This was from a database.....for your symptom. These can be challenging to
fix as the designs are usually very cramped.


--
==========================
Jeff Stielau
Shoreline Electronics Repair
344 East Main Street
Clinton,CT 06413
860-399-1861
860-664-3535 (fax)
[email protected]
========================
"If you push something hard enough it will fall over."
Fudd's First Law of Opposition - Sir Sidney Fudd