Transformer ID

[Herbssat]

Can anyone id this transformer and where it can be located for sale? The model is 370XEE19004 and found in a Toshiba 26C100U. Thanks.

[SLK001]

Re: Transformer ID

I doubt that you will find it for sale anywhere. It is probably a custom part made to Toshiba's specifications. More context as to where it is found might lead to better answers.

[budm]

Re: Transformer ID

Can anyone id this transformer and where it can be located for sale? The model is 370XEE19004 and found in a Toshiba 26C100U. Thanks.

May I ask what is wrong with the transformer?

[Herbssat]

Re: Transformer ID

Thanks Budm and SLK. Looks like one side of the primary is reading high resistance. This is the transformer for the 5v standby which i dont have on this set. Also compared it to a similar toshiba power supply where the resistance of the same side was about 2.2 ohms. This one fluctuates between 916ohms and 350ohms with my fluke meter.

[budm]

Re: Transformer ID

Did you verify that the transformer has the same pinout as the one you are comparing too?
How about the pictures of the bottom side of the board showing the pins you measure the resistance? There are at least 3 windings on that transformer.
Toshiba PK101V1540I
http://www.shopjimmy.com/toshiba-pk1...upply-unit.htm
Pictures provided by shopjimmy.

[Herbssat]

Re: Transformer ID

Will do my best to get some pictures up asap. There are no pinouts on this particular board. What i do know is that pin 4 on the other board provides drain and startup current for the A6069H pwm ic. Pins 4 and 6 are together reading 2 ohms. The suspected bad transformer reading is high resistance on the same 2 pins. Same ic on both boards. Also tested with a blue ring tester- bad Q. Thanks Bud.

[budm]

Re: Transformer ID

DCR Reading 2 Ohms are normal for this kind of transformer, what I an interesting are the pins that you said it has high resistance.
I can look at the bottom side of the board to figure out the pinout of the transformer.

[Herbssat]

Re: Transformer ID

Not the best picture Budm but i hope it helps.

[budm]

Re: Transformer ID

So it has 3 windings.
which one showing high resistance?

[Herbssat]

Re: Transformer ID

Thanks Budm. The primary drive winding which I presume may be pins 4and 6 like the other board that resembles this one. Toshiba pulled a stunt with this transformer.

[budm]

Re: Transformer ID

So the transformer is fine base on my pinout, right? I doubt that you have bad transformer. You better check the rectifier diodes on the secondary side, check the low resistance on the output filter caps to see if the loads have really low resistance, check the DCV of the SMPS IC, start up/running cap, etc.

[Herbssat]

Re: Transformer ID

Thanks for all your help Bud. I am primarily looking at another board that came from a Sanyo set. The manufacturer according to the diagram is fortran. They are very close. Another thing I noticed also was that the startup ic voltage was about 2.8 VoLts as opposed to 11.4 on the good board. What should the primary resistance be if your pin out is correct? I will go back and check what you mentioned. Keep in mind that the transformer on the bad board has high resistance in and out of circuit on the primary winding.

[budm]

Re: Transformer ID

The resistance of all 3 windings will be very low <10 Ohms.
What is the P/N of the SMPS IC?
Did you check the startup/running cap (C8025, 805) that is attached to the VCC pin of the IC?
What DCV do you get on the Drain pin of the SMPS IC?

[Herbssat]

Re: Transformer ID

The pn of the ic is A6069h. The startup cap was checked in circuit with an esr meter and there is no voltage on the drain of this ic. Filter cap voltage is about 166v. Thanks for your diligence budm.

[budm]

Re: Transformer ID

The pn of the ic is A6069h. The startup cap was checked in circuit with an esr meter and there is no voltage on the drain of this ic. Filter cap voltage is about 166v. Thanks for your diligence budm.

I will need good clear pictures of the bottom side of the board this time to trace out the connection between the D pins (pin 7, 8) to the + leg of the main filter cap to see if there is a fusible resistor in place or not.
Also check the resistor R702, 804, 805 to see if any of then show >10 Ohms.

[Herbssat]

Re: Transformer ID

Will try to get a good picture up soon but in the meantime will be checking other things mentioned. If you get a chance please look at my other post about the element elch321w that will not turn on. Thanks for all your assistance.

[Herbssat]

Re: Transformer ID

Here you go Budm. R805 is 10 ohms. Thanks again for your assistance.

[budm]

Re: Transformer ID

OK, so there is no fusible resistor between the + leg of the main filter cap and the leg of the primary drive transformer winding.
So did you solder all the transformer legs back in place and find out if you will get the 160VDC on the drain pins (7, 8) of the SMPS IC?
If the primary drive winding as I show in the pictures has very high resistance then it is bad which will explain why you do not have 160V on the drain pins (7, 8).
BTW, if the winding is bad, you may be able to look real close at the pin to see if the magnet wires are still connected to the pins.

[Herbssat]

Re: Transformer ID

I figured it was bad but I appreciate you being thorough budm. The transformer has already been soldered in place once before. The set was previously working but it has a weird history. The story that came from the customer is that someone before them placed something metal in the fuse holder in place of the fuse. The first fix looked to be a cold solder joint after resoldering the same transformer. It was probably failing then. The second time was the open primary and it did not work again. These are the strange issues that we as techs deal with.

[budm]

Re: Transformer ID

Are you in the US?