samsung t260 hd no power no led light power.

[feer]

hi to allguys i got a samsung t260 hd yesterday power on like few second flicker screen black then go off no more, power or led light on power button dissemble the monitor then remove the inverter tm-0918 i know the The secondary resistance is about 940 ohm between S1 and S2 (or S3 and S4). The primary resistance is about 0.3 ohm between P1 and P2.

mine are secondary resistance is about 1032 ohm between S1 and S2 (or S3 and S4).
and The primary resistance is about 0.3 ohm between P1 and P2. mines are reading in P1 and P2 primary resistance is about 0.9 ohm ? any insights on this would be a bad invert er any help greatly appreciated thanks fernando

[budm]

Re: samsung t260 hd no power no led light power.

So both high voltage windings resistance are within 3% of each other then?
Primary winding will be very low since you are measuring the DCR not the impedance of the winding.
How about some pictures? No sign of over heat around the transformer?
How about the ESR of the caps? Power supply Voltages are OK?
You may also have bad lamps, bad lamp's wiring.

[feer]

Re: samsung t260 hd no power no led light power.

hi budm i'm new on this all i have its a regular multi meter and sold iron to handle this, thanks very much for you reply i upload some pics front and back of the board.

[feer]

Re: samsung t260 hd no power no led light power.

few more

[feer]

Re: samsung t260 hd no power no led light power.






















front of the board guys

[feer]

Re: samsung t260 hd no power no led light power.

back now

[budm]

Re: samsung t260 hd no power no led light power.

So right now just to be clear, you DO HAVE power LED but you are not getting any backlights not even flicker of the backlights at all, right?
There is SMD POWER MOSFET with 4 legs on one side and big tab on the other side, we need the P/N so we can verify if it is OK or not.

[feer]

Re: samsung t260 hd no power no led light power.

no no power at all no flicker or backlights. any point to check here is SMD POWER MOSFET with 4 legs on one side and big tab on the other side, we need the P/N so we can verify, i'm new to this and need help how to check that?

[budm]

Re: samsung t260 hd no power no led light power.

no no power at all no flicker or backlights. any point to check here is SMD POWER MOSFET with 4 legs on one side and big tab on the other side, we need the P/N so we can verify, i'm new to this and need help how to check that?

OK, lets verify this first, disconnect the cable (red and black wires) between the power supply board and the main board. Power up the power supply board and then check the DCV on the connector pins between GND PIN and the 15.0V PIN, GND pin and the 5.2V Pin to see if it shows the correct Voltage

[feer]

Re: samsung t260 hd no power no led light power.

ok let me do that remember i'm new on this thas the slow speed

[feer]

Re: samsung t260 hd no power no led light power.

forgot to post this pics




let me know wath you think about thouse reads?