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Search: Posts Made By: lookimback
Forum: General Electronics Technical Discussion 04-12-2019, 03:07 PM
Replies: 12
Views: 242
Posted By lookimback
Re: Replacing failed photo resistor. How to determine value?

I'm thinking about doing that. I still have to run the circuit to where I need it, and I may not get to that for a couple weeks anyway. Pretty cool that I'm fixing this for about 4 cents.
Forum: General Electronics Technical Discussion 04-11-2019, 03:10 PM
Replies: 12
Views: 242
Posted By lookimback
Re: Replacing failed photo resistor. How to determine value?

I'm 100% certain it's the photo-resistor. I've tested it out of circuit and it barely changes between light and dark. Also, I've simulated it in circuit with a resistor and that makes the light work...
Forum: General Electronics Technical Discussion 04-11-2019, 11:11 AM
Replies: 12
Views: 242
Posted By lookimback
Re: Replacing failed photo resistor. How to determine value?

I tried cleaning it up, but no change.
Forum: General Electronics Technical Discussion 04-10-2019, 10:36 PM
Replies: 12
Views: 242
Posted By lookimback
Re: Replacing failed photo resistor. How to determine value?

I've been playing around with different resistances and it seems that somewhere around 33k is the tripping point. Anything above that will make it turn on.
Forum: General Electronics Technical Discussion 04-10-2019, 02:08 AM
Replies: 12
Views: 242
Posted By lookimback
Re: Replacing failed photo resistor. How to determine value?

It's one of those chip under blob things, so I don't have any way of knowing. The trimmer on the board is for range. Where am I measuring R?
Forum: General Electronics Technical Discussion 04-10-2019, 02:05 AM
Replies: 12
Views: 242
Posted By lookimback
Re: Replacing failed photo resistor. How to determine value?

New pictures below. Red circle is the LDR connections. Voltage is about 5.7v with the LDR removed.
Forum: General Electronics Technical Discussion 04-10-2019, 01:46 AM
Replies: 8
Views: 257
Posted By lookimback
Re: Repair side cutter

I replaced these and within a week I blew up the new pair. I needed to cut the end off a cord for a project, and accidentally cut the wrong cord. The one I cut was plugged in. Oops. Was going to...
Forum: General Electronics Technical Discussion 04-10-2019, 01:26 AM
Replies: 12
Views: 242
Posted By lookimback
Replacing failed photo resistor. How to determine value?

I just replaced an outdoor motion activated light for my friend and decided to troubleshoot the old one. Within a few minutes I determined the LDR(photo resistor) was bad. It only changes about 5...
Forum: Troubleshooting TVs and Video Sources 11-02-2018, 12:05 PM
Replies: 8
Views: 299
Posted By lookimback
Forum: Troubleshooting TVs and Video Sources 11-01-2018, 05:23 PM
Replies: 5
Views: 315
Posted By lookimback
Re: YSUS EBR73561201 clicking off on a LG 60PV400

Checked them all. Last time some were bad, but not this time. I notice VSC is only 12v. Possibly it would be higher if I wasn't using the lightbulb limiter, but definitely still quite low.
Forum: Troubleshooting TVs and Video Sources 11-01-2018, 04:57 PM
Replies: 5
Views: 315
Posted By lookimback
Re: YSUS EBR73561201 clicking off on a LG 60PV400

Good job! I found two bad resistors, and two more bad FGPF4633s on the Y smd Z boards, but I still have a short somewhere on the Y. I use a lightbulb in series with VS ro limit current so I don't...
Forum: Troubleshooting TVs and Video Sources 11-01-2018, 02:11 PM
Replies: 8
Views: 299
Posted By lookimback
Re: Plasma logic board and "Test mode"

As far as a panel test goes, I don't think it matters if your TV is PAL or NTSC. I've attached a datasheet for a model which uses that logic board. Details are on page 5.
Forum: Troubleshooting TVs and Video Sources 11-01-2018, 01:06 AM
Replies: 8
Views: 299
Posted By lookimback
Re: Plasma logic board and "Test mode"

They just cheaped out on putting the pin headers in. Jumper 3-4.
Forum: Troubleshooting TVs and Video Sources 10-31-2018, 10:03 PM
Replies: 5
Views: 315
Posted By lookimback
Re: YSUS EBR73561201 clicking off on a LG 60PV400

I'm working on the exact same board right now. I fixed it before and it worked for 6 months. Check all the RF2001 diodes . Some are attached to heat sinks, a couple aren't. When I fixed this before,...
Forum: Troubleshooting TVs and Video Sources 10-31-2018, 02:22 PM
Replies: 19
Views: 403
Posted By lookimback
Re: Y sustain keeps blowing FETs ? (LG)

Yeah, that's the crazy part. You replace some bad FETs, and some other ones somewhere else on the board blow. It's like how lightning never strikes twice in the same place. They certainly are...
Forum: Troubleshooting TVs and Video Sources 10-27-2018, 02:34 PM
Replies: 18
Views: 737
Posted By lookimback
Re: Telefunken Vegas 42" plasma TV not starting

Post a picture of the logic board.
Forum: Troubleshooting TVs and Video Sources 10-27-2018, 05:13 AM
Replies: 4
Views: 286
Posted By lookimback
Re: Vizio M422i-B1 boot loop.

Well, at this point I'm pretty much convinced the eMMC has failed. After a lot of research, I attempted to reverse engineer the pinout and see if I could extract the firmware image. I was able to...
Forum: Troubleshooting TVs and Video Sources 10-27-2018, 04:08 AM
Replies: 19
Views: 403
Posted By lookimback
Re: Y sustain keeps blowing FETs ? (LG)

You can use a light bulb in series with the VS to limit the current. That will usually save the FETs. I'd say probably 100 watt. I tried a 60w tonight and still blew a FET, but 1 is better than 6. I...
Forum: General Computer & Tech Discussion 10-26-2018, 03:50 AM
Replies: 26
Views: 710
Posted By lookimback
Re: 10 hours lost because stupid laptop wouldn't boot! GRRR!

Lol, perhaps, but I'd say this is a situation which should be expected to occur.
Forum: General Computer & Tech Discussion 10-26-2018, 03:08 AM
Replies: 26
Views: 710
Posted By lookimback
Re: 10 hours lost because stupid laptop wouldn't boot! GRRR!

I think I might have figured it out. I was trying to figure out why an eMMC wasn't being detected and ran sudo tail -f /var/log/syslog. What I saw was a steady stream of error messages, like hundreds...
Forum: General Capacitor Questions & Issues 10-25-2018, 07:47 PM
Replies: 96
Views: 29,658
Posted By lookimback
Re: How to Recondition (Reform) Electrolytic Capacitors and Why

I had to open one to fix it once and was surprised to see it was just a mini SMPS. Since then, I've modified several, including one from a Nintendo DS which now provides 3.3 volts to a bluetooth...
Forum: General Computer & Tech Discussion 10-25-2018, 01:31 PM
Replies: 26
Views: 710
Posted By lookimback
Re: 10 hours lost because stupid laptop wouldn't boot! GRRR!

I agree they can be useful. I'll probably make a script to delete entries more than x days old or something.



I'm wondering if it would have eventually started. I waited about 15 minutes, then...
Forum: General Computer & Tech Discussion 10-25-2018, 04:17 AM
Replies: 26
Views: 710
Posted By lookimback
Forum: General Capacitor Questions & Issues 10-25-2018, 04:14 AM
Replies: 96
Views: 29,658
Posted By lookimback
Re: How to Recondition (Reform) Electrolytic Capacitors and Why

Nice write up. You could also crack your power adapter open and add a potentiometer to the feedback circuit of the PWM so you could then adjust the duty cycle to get different output voltages.
Forum: General Computer & Tech Discussion 10-25-2018, 03:17 AM
Replies: 26
Views: 710
Posted By lookimback
10 hours lost because stupid laptop wouldn't boot! GRRR!

Woke up this morning ready to get some work done, and the laptop was frozen. Tried everything, and ultimately had to hard reset. And then I got the dreadful blank screen with the little blinking dash...
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