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I have a TCL 21inch CRT TV. When it plug to AC some noise come form the SMPS transformer (chopper) did not TV work. Please can you guess the problem.

I checked AC cord, Fuse, Rectifiers, Capacitors, Resistors etc. in the power supply stage. Everything is OK. I replaced SMPS control IC (TEA1506P) and Transistor (K2645).

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Sounds like SMPS transformer is faulty. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/

Posted on Dec 05, 2014

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Posted on Jan 02, 2017

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Slinteriors
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SOURCE: TV HV

usually when thiers arching its usually inside the flyback connection that causes the arching.I reccomend changing the flyback.

Posted on Apr 13, 2008

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SOURCE: Sanyo ST-21G1 dead set

There should be a small valued cap in the primary side (22ufd?) at 250V. Check that. Also, look for other small caps int he range of 2.2ufd with 200V ratings in the same general area.
Dan

Posted on May 07, 2008

Maciso
  • 125 Answers

SOURCE: LG CRT HDTV Dead no picture

if you have the b + acording the manual then you loose it
could be many things like the vert. circuit, the crt itself or
the flyback,

Posted on Aug 06, 2008

  • 1 Answer

SOURCE: LG vertical failiure vertical line at the bottom of the crt

replace the vertical driver ic and the proccesor ic

Posted on Nov 25, 2008

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SOURCE: sony color TV model kv-c29 11d blown power supply ic and transist

There should be circuit designations printed on the PC board. Without those, there are too many possibilities to give you anything useful. Can you provide those please?

Thanks,
Dan

Posted on Jan 21, 2009

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you need to check the voltage output of your power supply section.This power supply supply is a switching type power supply.there is a chopper transformer in there.its supply is a dc voltage unlike any other transformer which is AC supplied on the primary..First step.
1.Using a multitester measure the primary supply it is a DC voltage around 220v - 110 VDC
2.Measure the secondary output.The out put is AC voltage the supply for the B+ going to plyback is 115vdc the second output is 12v run through a regulator and the regulator lower the voltage to 5vdc.this 5vdc supplies the system IC and the jungle IC.this ic process the switching of the plyback transformer and the plyback transformers output supplies the voltage of the whole system including your relay in the degaussing section....once the plyback is activated the tv will now turn on...

good luck!Hope i helped you..

please rate my help..god bless!

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