samsung LA 22A450C1

[aanan]

samsung LA 22A450C1 [BN64-00803A ] no diplay smps on 13.5v present.red led glowing i dont no inverter circuit i need schematic.

[aanan]

Re: samsung LA 22A450C1

anyone please.

[aanan]

Re: samsung LA 22A450C1

samsung LA 22A450C1 [BN64-00803A ] no diplay smps on 13.5v present.red led glowing i dont no inverter circuit i need schematic.

i upload board image.

[Rtech]

Re: samsung LA 22A450C1

Check Inverter transformer secondary windings for resistance.

[selldoor]

Re: samsung LA 22A450C1

Check Inverter transformer secondary windings for resistance.

see here for pin out - no power to board - meter on ohms 2000
test s1 to s2 an s3 to s4 and post results.

http://lcdparts.net/TransformerDetai...ProductID=3721


Also test that green torpedo fuse F301

[aanan]

Re: samsung LA 22A450C1

Friend Rtech & selldoor.
i check fuse it is ok.
TR pinout s1 to s2 1.023 ohms s3 to s4 1.023 ohms
i suspect inv osc ic i need ic pin voltage.
Thanks for reply.

[Rtech]

Re: samsung LA 22A450C1

That is the Green fuse you have checked ?????,also have you checked the Backlights ??

[aanan]

Re: samsung LA 22A450C1

i checked fuse & backlights.no output hi voltages inv transformer.
Thanks Rtech.

[aanan]

Re: samsung LA 22A450C1

i checked fuse & backlights.no output hi voltages inv transformer.
Thanks Rtech.

Please schematic upload.

[budm]

Re: samsung LA 22A450C1

Can you read the P/N of the SMD PWM IC and the MOSFETs which drive the inverter transformer?
Also check the DC voltage on that connector where the wires go to the logic board, I can see the labeling but cannot read them. We need to find out if the inverter circuit is getting the inverter_on (BL_ON) signal or not.

[viziks]

Re: samsung LA 22A450C1

Friend Rtech & selldoor.
i check fuse it is ok.
TR pinout s1 to s2 1.023 ohms s3 to s4 1.023 ohms
i suspect inv osc ic i need ic pin voltage.
Thanks for reply.

This does not seem to be an Inverter issue at all.
This is a TV and not a standalone Computer monitor,when you power on the power led should blink and come on.Connect AV signals and after power on keep pressing source(Input select) on remote,if TV is working with signals connected you should be able to hear the Audio.
I suspect the Logic board is defective which is a known failure for this model.Check 3V3,5V and 1.5V on the logic board and if all voltages are present suspect defective main board.
On this model I was not able to bring on the Back-lights by pulling up the pin from 5v on logic board.

I have recently repaired this TV motherboard with the same problem of No operation except power led blinking when operating with remote or panel switches.

Just heated the metal shielded box which has the micro processor ICs.

Samir

[budm]

Re: samsung LA 22A450C1

"On this model I was not able to bring on the Back-lights by pulling up the pin from 5v on logic board." if you do not disconnect the BL_ON line from the main board if the BL_ON is being held LO by the main board, it will not allow the BL_ON to go HI using the resistor.