LG Flatron 1520B may possibly be bad

[lkvee]

Got one from Freecycle. Donor says the screen just went dark on day. I plug it in, and it does power up telling me to "Check Signal Cable". That status hasn't changed for the past 10 minutes leading up to this posting. I'm led to believe this monitor had been dormant for quite some time.

I see seven capacitors, all with either the SamYoung or Rubycon brand. There's one I can't identify. I'm using ESR Micro 3.1 testing in circuit.

The big SamYoung capacitor specified for 68 uF and 450V tests for 69 uF and 0.38 Ohms.

There's a Rubyon ZL on its side specified for 470 uF and 25V. It tests at 1375 uF and 0.03 Ohms.

The two SamYoung KMG capacitors specified for 330uF and 25V test at 1370 uF and 0.33 Ohms & 836 uF and 0.15 Ohms.

There's a small SamYoung KMG capacitor specified for 22uF and 50V. It tested at 16uF and 5.4 Ohms. That bothers me.

There's a SamYoung KMG specified for 470 uF and 25V and tests at 830uF and 0.00 Ohms.

There's a T0348 ZL (Rubycon?) also specified for 470 uF and 25 V and tests at 1365 uF and 0.00 Ohms.

I also test what I think is a fuse to the right of the small capacitor and northeast of the capacitor cluster. There *is* continuity.

Anything else I should examine? I keep hearing debates on the reliability of SamYoung capacitors, too.

Thanks for reading!

[retiredcaps]

Re: LG Flatron 1520B may possibly be bad

1) If you hookup a working computer displaying your favourite, does the check signal disappear?

2) Please post a picture of your logic board with resolution close to 2000x2000.

[Th3_uN1Qu3]

Re: LG Flatron 1520B may possibly be bad

Anything else I should examine? I keep hearing debates on the reliability of SamYoung capacitors, too.

Samsung used them a lot. All i can say is that they are not "bad" the same as the likes of Fuhjyyu, but they do fail.

[PlainBill]

Re: LG Flatron 1520B may possibly be bad

Samsung used them a lot. All i can say is that they are not "bad" the same as the likes of Fuhjyyu, but they do fail.

Are you confusing two similar brands? I know SamWah caps are used in a lot of Samsung products. They are generally good, but have some defective lots. Definitely second tier.

Sam Young are 'replace on sight', pure garbage.

PlainBill

[lkvee]

Re: LG Flatron 1520B may possibly be bad

I plugged it into a laptop, and was able to extend to desktop onto this monitor. I couldn't use it as the primary monitor, but I'm guessing that's me failing with the laptop.

I misread the attachment requirements and was reading those for the JPE extension. I hope this one will work better.

[retiredcaps]

Re: LG Flatron 1520B may possibly be bad

I plugged it into a laptop, and was able to extend to desktop onto this monitor.

Does this mean the lcd is working now?

PS. The logic board is usually green with the inputs (VGA, HDMI, DVI, etc).

[lkvee]

Re: LG Flatron 1520B may possibly be bad

Essentially, it IS working now. I would really really really like to replicate the condition which caused it to fall into my hands in the first place.

Guess I'll have to stress test it some more. Those 5 Ohms on the small cap still bother me.

[Th3_uN1Qu3]

Re: LG Flatron 1520B may possibly be bad

Sam Young are 'replace on sight', pure garbage.

PlainBill

They held up for 13 years in my Samsung CRT. And only one failed, a 10uF 450v cap IIRC. The others are still kicking, the only thing that's showing obvious signs of aging is the tube, but that's because mom always forgets to turn it off when she goes to sleep. You can imagine the number of hours this has, essentially being on 12 to 14 hours per day.

Guess I'll have to stress test it some more. Those 5 Ohms on the small cap still bother me.

Then replace it. A normal ESR on a small cap like that is around 1 ohm, not 5.

[retiredcaps]

Re: LG Flatron 1520B may possibly be bad

Those 5 Ohms on the small cap still bother me.

A new Panasonic FC (lowish ESR) is 1.3 ohms. FM is 0.340 ohms.

http://search.digikey.com/scripts/Dk...name=P10318-ND

http://search.digikey.com/scripts/Dk...2uf%2050v%20fm

5 ohm could be correct depending on the original specs.

[retiredcaps]

Re: LG Flatron 1520B may possibly be bad

TYou can imagine the number of hours this has, essentially being on 12 to 14 hours per day.

No sleep timer? You can save a whack of $$$ electricity bills too.

[Th3_uN1Qu3]

Re: LG Flatron 1520B may possibly be bad

No sleep timer?

Of course it has one. But a sleep timer requires user intervention. My mom always falls asleep before setting the sleep timer.

[retiredcaps]

Re: LG Flatron 1520B may possibly be bad

Of course it has one. But a sleep timer requires user intervention. My mom always falls asleep before setting the sleep timer.

I won't add anymore after this (so I don't pollute the thread), but how about this?

http://www.homedepot.ca/eco-options/...rs-with-timers

One great way to reduce standby power is to use the GE plug-in 24-hour mechanical strip timer. If there are specific times throughout the day and night when a grouping of devices won't need power, plug them into a power bar with built-in timer, and watch the savings grow.

TV, DVD, cable box, and stereos can all be plugged into one power bar. Set it to turn off at night when everyone's asleep or during the day when everyone's out

[Th3_uN1Qu3]

Re: LG Flatron 1520B may possibly be bad

You know, that's actually a good idea. Something where i can use that little 8-pin PIC i thought i had no more use for. One crystal, one transistor, one relay, done. I'll patch it together next week. Of course i could just buy one but why when i have all the stuff lying around.