Magnovox / Philips 26MF605w/17

[john98103]

Hello all,

I'm working on a Magnavox / Philips model # 26MF605w/17 which is a 26” lcd television. Power supply part number is 313815859161.

I'm seeking advice on choosing a replacement part that I think was a resistor. The end caps of the fried part are within 5mm of each other which makes it much different from the neighboring resistors.

The other part which is obviously damaged is an IC with the following markings:
TEA 15
N5H5DO
N5H5K5
Hn5401
Any thoughts why pin 6 would be fried and or why the risistor would be fried and how best to choose a replacement?

[retiredcaps]

Re: Magnovox / Philips 26MF605w/17

The other part which is obviously damaged is an IC with the following markings:
TEA 15

My guess is TEA 1532, a pwm IC.

[momaka]

Re: Magnovox / Philips 26MF605w/17

Great, no standard part prefixes on the PCB . Whoever designed/made this power supply needs to be hit on the head 1000 times like this . It's like they thought this thing would never break (especially with the CapXon caps), so why make it service-friendly, right?

Anyways, enough of my ranting.
It seems that there are prefixes for the parts on the PCB (just not standard). What I've got so far: a prefix of 2 indicates a capacitor, 3 a resistor, 5 an inductor, 6 a diode, 7 an IC or transistor, and 9 for jumper/wire.

If I'm not mistaken, looks like the burned component in question corresponds to the marks "9053" - i.e. a simple jumper/wire. This needs to be double-checked, though, because the component to the left of that is a jumper/wire marked with "6054", but according to the PCB marks, this should be a diode. Since the TV was working fine before, I wouldn't call this a mistake, but rather some weird change in design.
Therefore, I would strongly suggest you post some pictures of the under side of the power supply so that we can check if the burned component "9053" you asked about really is a jumper wire.

Also, was there a part installed for the spot corresponding to "3069"? If so, that should be a resistor, then. But again, a picture of the underside would be very helpful.

Considering the failure, it's probably also a good idea to check all of the other parts on the primary side, like to check for open resistors and shorted diodes and transistors.

[john98103]

Re: Magnovox / Philips 26MF605w/17

thanks for the imput.

I found a marketing picture of this PS and am including it for your inspection. it shows there is a component at the location in question; I just don't know what it might be. any thoughts?

also attached is an image of the back side; I rotated the board up so what was originally in the northeast corner is now in the southeast corner

[Dgtech]

Re: Magnovox / Philips 26MF605w/17

Here is a picture of what this board is supposed to look like. If I read it correctly, it may look like a Red Red Brown - 220 ohm. I'd up the wattage though, lol.

[momaka]

Re: Magnovox / Philips 26MF605w/17

Alright, nice underside picture. Very helpful (will be using it for reference for most of my post below so have it open).

The burned part in question seems to correspond to 3083, a resistor, as Dgtech noted (and NOT 9053 as I wrote in my previous post) - you can see the marking on the underside picture. This resistor connects the Gate of the switching MOSFET 7062 to pin 6 (Driver) of the PWM controller, IC 7061.

Speaking of the PWM controller, a TEA1532 does NOT match the pinout that is on this board. However, these do: TEA1506P, TEA1506AP, TEA1507, TEA1533P, TEA1533AP, and even possibly TEA1541. My guess is you can use any of these for a replacement.

Now, back to that burned resistor - I found another, bigger, picture here:
http://www.interliquidparts.com/wp-c...8_103_6282.jpg
From the picture, it seems that the resistor is either 220 Ohms (red-red-brown-gold) or 2.2 Ohms (red-red-gold-gold). According to all of the above data sheets for the PWM controllers I listed, Pin 6 (Driver) is connected directly to the Gate of the switching MOSFET. Therefore, I think the proper value would be 2.2 Ohms. (Someone with more experience on the matter, please double-check me on this.)

Since both the resistor and the PWM controller looked burned, I would suggest you check almost everything on the primary side, particularly the diodes for short circuit and the resistors for open circuit. You don't need to remove them from the board. If in doubt about a reading on a component, ask here or remove it from the board and test it before concluding it's bad.

Just to name a few parts you should definitely check:
- The small red SMT diode (6083??) on the underside that is in series with the burned resistor, along with the two small SMT resistors with the codes on top "102" and "151".
- MOSFET 7062, resistor 3081, diodes 6055 and 6056 (near the ceramic capacitor 2061)
- diodes 6065, 6066, and 6067 (these provide the PWM controller with power).
- bridge rectifier 6051 and the main fuse, 1052.

Might also be worthwhile to check the APFC section, namely diode 6052, MOSFET 7057, and resistor 3059.

That's pretty much all of the main stuff.

[retiredcaps]

Re: Magnovox / Philips 26MF605w/17

Speaking of the PWM controller, a TEA1532 does NOT match the pinout that is on this board. However, these do: TEA1506P, TEA1506AP, TEA1507, TEA1533P, TEA1533AP, and even possibly TEA1541. My guess is you can use any of these for a replacement.

Good catch there.