sharp lc32sb24u bulb / inverter problem

[retiredcaps]

Re: sharp lc32sb24u bulb / inverter problem

Try www.lcdparts.net, but if you can get the new board for $20, that will be a lot better to have spare transformers and other parts. One transformer plus shipping will be $12~20.

We had one member buy an entire inverter board (iirc, around $20) just to get 2 replacement transformers because it was cheaper than buying 2 separate transformers ($24.99 each) from other vendors.

[budm]

Re: sharp lc32sb24u bulb / inverter problem

Try www.lcdparts.net, but if you can get the new board for $20, that will be a lot better to have spare transformers and other parts. One transformer plus shipping will be $12~20.

[cashkennedy]

Re: sharp lc32sb24u bulb / inverter problem

Any idea where to look for a replacement transformer / inverter like the one in the picture (z1358 08086).

Theres a almost exact match for the whole power inverter board for 19.99 on ebay, so i might just check if that guys board has the right inverters. (The cheapest exact match for the power inverter board is 60 though and from a bad seller)

[cashkennedy]

Re: sharp lc32sb24u bulb / inverter problem

Yep here are some pics, tell me if other would help.

I numbered the pins from left to right when looking at the front of the board (yellow side). And just from looking at the backside i can see now that the pin 3 is neither the primary nor the secondary but appears to have some sort of management function, as well as pin 4 appears to possibly be what monitors the ouput and reports the bulb failures.

Pins 5 (top and bottom), which i was testing as the secondary, are what i got 2.58 kohms for all but the 1 that for the most part is open.

And pins 1, 2 on top and bottom of each have 0.5 ohms (so almost no resistance) (i tested 1 top to 1 bottom, 1 top to 2 bottom, 1 top to 2 top and all were the same )

[budm]

Re: sharp lc32sb24u bulb / inverter problem

Can we see closed up pictures of the transformer top of the board and bottom of the board?

[cashkennedy]

Re: sharp lc32sb24u bulb / inverter problem

Well actually i just looked at it, to try to test the inverters, and they are infact quite easy to get to, since they are the spools of copper wire next to the black connectors.

So there are 5 inverters, at first when i measured the secondaries all were around 2.58 kohm, although one is 2.65 so slightly above the rest. But then after testign the primaries (which all have around 0.5 ohms resistance) i retested the secondaries and the bottom most inverter reads open. Occasionally id get a few seconds of a reading, but no matter how good of a connection i tried to make i couldnt get it to consistently read 2.58 ohms. So im guessing the problem is with that inverter.

I tried flexing (the board has a LOT of flex ability) the board so that it wouldnt be connected to the bottom bulb, but all times i try it like that the tv wont clear the flashing green error, so i guess it isnt dumb enough to start with a bulb unplugged.

So what do yall think? Bad inverter?

Oh also, ive never worked on bulb inverters before, so im not sure if im choosign the right places to read the windings from, but these ones have 5 poles on each side of each transformer. when i measure the primary poles 1, and 2 on the top, and 1 and 2 on the bottom are all 0.5 ohms from each other. Poles 3 on top and bottom, are open to all the other poles so i think are not being used. Pole 5 on top and bottom is where i measured the secondardy on each one and got 2.58 kohms on most.

[cashkennedy]

I picked up this sharp lc-32sb24u and it has a flashing green light seems to be an even pace of 1 flash per second. Holding down the input and volume down while plugging it in resets the error and it will start and run for about 3 seconds.

I consulted the manual for this model which says to just read the manual for lc-32d44u. So in that manual it says that 1 green light flash is an error with the bulb.

Normally after knowing the bulb / inverters are probably the issue i would see if i could disconect each bulb seperately and test the tv with 1 disconected at a time, but if you look at the picture of this unit the inverter is screwed directly into connectors for the bulbs, so im not sure if there is any easy way to disconect 1 at a time.

Second thing to check is if the windings have the same resistance on each inverter, which im going to try and check, but im not sur eif the secondarys have any exposed pins considering the way they go through the bottom of the board and connect straight to the bulb connectors.