Samsung 2693HM white screen

[xscp]

Re: Samsung 2693HM white screen

It is working fine with the new fuse, there were 1 or 2 minor glitches in the first few days, but they seem to be gone too.

Any idea what could have caused the fuse to blow? And why did the display work after I first took it apart? I thought it was the reseating of the cables that helped but that seems unlikely now.

Thanks for the help!

[selldoor]

Re: Samsung 2693HM white screen

For testing 3A 32v would be ok Doesnt even have to be same type - you can use a pico and yes just piggyback it on top of the old fuse -cuts down on possibility of damage to the board. Being slightly lower amps may mean it blows so be aware of that.

[xscp]

Re: Samsung 2693HM white screen

Since I doubt I can find the exact same fuse here, what should i look for? Same size, 3.15A and 24V? Any other specs matter?

Do the current rating and rated voltage have to be exactly the same? I looked around and most I find around here are rated 3.0A / 3.5A and 32V or above.

Can I solder it on top of the old one?

[budm]

Re: Samsung 2693HM white screen

OK, then that fuse on the T-CON is bad.

[xscp]

Re: Samsung 2693HM white screen

Next time the board is in the machine can you try to remember to test the voltage on each side of the fuse with respect to ground.

I thought he meant the fuse on the main board (picture 5), because that's what he mentioned in post 2. This one had 0 resistance and 5.27V on both sides.

In my last post I wrote about the one on the t-con, the one pointed out by mmartell, this had 100 / 245 ohm resistance and 5.28V and 1.04V on its ends.

[budm]

Re: Samsung 2693HM white screen

The capacitors on the t-con seem fine, none of them had low resistance. The lowest was around 0.4K iirc.

Both side of the fuse was 5.27V. VDDA, VDDG and VEEG were all 0.

I checked the voltages on the psu at the connectors (5.3V / 18V / 24V) and they were ok.

Is that a fuse? I can't make a better picture at the moment, it has UD written on it if that helps.

Its resistance was 100 ohm (at first), voltages were 5.28V and 1.04V, with the latter jumping down to 0.8-0.9V and occasionally to 0V. When i checked the resistance again it was 245 ohm.

That is why I am confused because you indicated that it has 5.27V on both ends of the fuse but the regulators show almost nothing.
So which FUSE did you test on the T-CON to get that 5.27V on both ends and now you have 5.28V on one end and 1.04V on the other end?

[retiredcaps]

Re: Samsung 2693HM white screen

A good fuse should measure less than 1.0 ohms.

UD code suggests 3.15A 24V as per

https://cdn.badcaps-static.com/pdfs/...7263e74802.pdf

[mmartell]

Re: Samsung 2693HM white screen

Ya I can't be sure and I'm not familiar with that marking either.

[xscp]

Re: Samsung 2693HM white screen

Is that a fuse? I can't make a better picture at the moment, it has UD written on it if that helps.

Its resistance was 100 ohm (at first), voltages were 5.28V and 1.04V, with the latter jumping down to 0.8-0.9V and occasionally to 0V. When i checked the resistance again it was 245 ohm.

[mmartell]

Re: Samsung 2693HM white screen

Here..

[mmartell]

Re: Samsung 2693HM white screen

It *may* be on the left side of the lvds connector, on the top right of the barcode sticker labelled "FU10" but hard to tell.

[budm]

Re: Samsung 2693HM white screen

For the light of me, I cannot see the fuse on the T-CON board, I expect it to be close to the right side of the LVDS connector.

[xscp]

Re: Samsung 2693HM white screen

J384 1117-18
Left = 0 V
Middle = 0 V
Right = 0.45 V - 0.75 V

J164 G1084-33
Left = 0 V
Middle = 0.45 V - 0.75 V
Right = 0.85 V - 1.05 V

The voltages were jumping up and down.

[selldoor]

Re: Samsung 2693HM white screen

Wrong - If you re doing a voltage test then black probe to chassis ground
and probe each pin, meter on vDC20

[budm]

Re: Samsung 2693HM white screen

Please report in this format:
Big tab up, Black probe on chassis.
Left (1, GND)) = xxx V
Middle (2, or tab, output) = xxx V
Right (3, input) = xxx V

[xscp]

Re: Samsung 2693HM white screen

I meant the fuse on the main board.

I tested the voltage regulators (the outer pins to the middle/ground, right?), 17-18 was 0 / 0.1-0.6V, 33 was 0 / 0.6-0.8V

[selldoor]

Re: Samsung 2693HM white screen

Cant actually see the fuse? anyway can you test the voltage regulators - left hand side of the board one is a1117 18 the other ends in 33

[xscp]

Re: Samsung 2693HM white screen

The capacitors on the t-con seem fine, none of them had low resistance. The lowest was around 0.4K iirc.

Both side of the fuse was 5.27V. VDDA, VDDG and VEEG were all 0.

I checked the voltages on the psu at the connectors (5.3V / 18V / 24V) and they were ok.

[selldoor]

Re: Samsung 2693HM white screen

Yes I think they are - it is not too critical as he is not testing those he says to test the
capacitors part numbers C??? in the area around them - they are the buff/brown ones.
Maybe as it is a slightly different board the caps may be better.

Next time the board is in the machine can you try to remember to test the voltage on each side of the fuse with respect to ground.
Hopefully Momaka will join in when you have the voltage tests and tell us what he thinks.

[xscp]

Re: Samsung 2693HM white screen

I think I had the meter on wrong settings or something, I checked again and now it was 0 for both the fuse and the probes touched together.

My t-con seems to be different than the one in the other thread. I followed what momaka wrote and measured VDDA, VEEG and VDDG, they were 5K, 41.9K and 99.8K in that order. I will measure the capacitors and voltages tomorrow.

Are the highlighted components the ones he mentioned (D502, Q503, and Q504, and D504)? The labels are a bit cluttered.