BN44-00517C dead - blown cap, resistor and fuse

[dazzystar]

Because I don't have one available and to buy just would be expensive, plus I don't have an SMD soldering station. So, if replacing the fuse, cap and resistor doesn't fit it and I can't get a replacement PSU board for little money in the UK then it's the bin for the TV which would be a shame.

[diif]

Available from ebay for cheap. Use the same soldering iron you'll use for replacing the other components. Use some low melt solder.

[dazzystar]

Thanks but I can't find them on ebay.co.uk

[diif]

https://www.ebay.co.uk/sch/i.html?_f...2S110&_sacat=0

[nomoresonys]

Because I don't have one available and to buy just would be expensive, plus I don't have an SMD soldering station. So, if replacing the fuse, cap and resistor doesn't fit it and I can't get a replacement PSU board for little money in the UK then it's the bin for the TV which would be a shame.

You can probably do it if you take your time, maybe watch a couple youtube videos, there's plenty available.

[dazzystar]

Well I've ordered the part but I hope I can figure out how to fit it and it'll work!

[lotas]

You also need to check the components next to this smd chip (low-resistance resistors, diodes....).

[Davi.p]

Must to use the lamp in series to input.. to keep safe the new conponents.. you have to check if mosfet is shorted D-G, if yes the oscillating IC is 100% dead..

[dazzystar]

Well we replaced the PWM chip as well but still no joy. No standby light. So out of options now.

[diif]

Well we replaced the PWM chip as well but still no joy. No standby light. So out of options now.

Did the check the components next to it ?

[dazzystar]

Thanks but not sure which one(s) you mean. Here's a pic of the new PWM chip.

[dazzystar]

I should also add that when I plug the TV to mains power I hear the satisfactory 'click' from the PSU so something is better than what it was!

[lotas]

Have you checked these zener diodes?

[dazzystar]

No. I haven't. They seem to have 3 legs on them. How do I test with my multimeter?

[lotas]

No. I haven't. They seem to have 3 legs on them. How do I test with my multimeter?

They have two legs (1, 3) connected together, so that they have two, like a regular diode (zener diode).

[dazzystar]

From 1 I get a beep in both directions with my DMM and a reading of around 70 ohms. From 2, 3 and 4 I get nothing in either direction from the DMM

[lotas]

At 1 you get a sound signal because there is a 68 Ohm resistor (680) in parallel with it.

[dazzystar]

Thanks again. Does that mean the other 3 diodes are faulty?

[lotas]

When checking in the "Diode" mode, they should show only in one direction, this is when the red probe is on the anode, and the black one is on the cathode, scrape off the varnish on the terminals and check again, maybe there is a bad contact with the probe, if nothing happens, then you need their replacement.

[dazzystar]

OK. I will check again soon and report back. Does it sound like number 1 is faulty as I get a sound and a meter reading in both directions?