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Search: Posts Made By: midnightg35x
Forum: General Capacitor Questions & Issues 06-26-2018, 09:46 AM
Replies: 8
Views: 353
Posted By midnightg35x
Re: Help Identifying Capacitor Brands

There are plenty of 85 degree caps that are more than general purpose, which is why I was trying to find specific info on these two caps.



Thanks. The TCI marked one is not as important to me...
Forum: General Capacitor Questions & Issues 06-26-2018, 12:14 AM
Replies: 8
Views: 353
Posted By midnightg35x
Help Identifying Capacitor Brands

Can anyone identify the manufacturer or model of the two following capacitors? Google did not help me much in my quick search. I can't seem to find any information on them. These are out of an older...
Forum: Troubleshooting TVs and Video Sources 04-14-2018, 12:39 AM
Replies: 122
Views: 2,782
Posted By midnightg35x
Re: Vizio P502UI-B1E has no backlight, no voltage from driver board to LED's

Looks to be a MMBT3904. Fairly common if you have spare parts or spare boards. I think I checked that particular transistor on my board with a multimeter and it was OK. I'm not sure what the...
Forum: Troubleshooting TVs and Video Sources 04-09-2018, 04:07 PM
Replies: 122
Views: 2,782
Posted By midnightg35x
Re: Vizio P502UI-B1E has no backlight, no voltage from driver board to LED's

So the ebay board changed the issue, but did not solve it?
Forum: Troubleshooting TVs and Video Sources 03-25-2018, 12:39 PM
Replies: 122
Views: 2,782
Posted By midnightg35x
Re: Vizio P502UI-B1E has no backlight, no voltage from driver board to LED's

If U712 is a tps54328, pin 2 is the feedback. It should be at ~0.76V during normal operation according to the datasheet. I don't think that one is the issue. if the output voltage on that...
Forum: Troubleshooting TVs and Video Sources 03-24-2018, 07:36 PM
Replies: 122
Views: 2,782
Posted By midnightg35x
Re: Vizio P502UI-B1E has no backlight, no voltage from driver board to LED's

I did one quick check that if I apply +5V from an external supply to the LED driver board on the gray wire, the 4 converters do show +12V at L801-L804. The LED did not light up yet though. So far I...
Forum: Troubleshooting TVs and Video Sources 03-24-2018, 12:18 PM
Replies: 122
Views: 2,782
Posted By midnightg35x
Re: Vizio P502UI-B1E has no backlight, no voltage from driver board to LED's

A FLIR One Gen 2 https://www.flir.com/support/products/flir-one-gen-2

It helps finding shorted components sometimes without using my finger everywhere. Unfortunately, it didn't seem to help much...
Forum: Troubleshooting TVs and Video Sources 03-23-2018, 12:54 PM
Replies: 122
Views: 2,782
Posted By midnightg35x
Re: Vizio P502UI-B1E has no backlight, no voltage from driver board to LED's

Just a follow up to this. I took a couple thermal shots of the main board with the heat sink removed. Everything to me in this post is pointing to the main board, so I figured I would try to reflow...
Forum: Troubleshooting TVs and Video Sources 03-17-2018, 04:44 PM
Replies: 122
Views: 2,782
Posted By midnightg35x
Re: Vizio P502UI-B1E has no backlight, no voltage from driver board to LED's

I'm going to chime in here that I have the same TV with identical symptoms to triplefour. My backlights do not try to fire at all like al1415. I have tried replacing the EEPROM with no luck.
...
Forum: Troubleshooting TVs and Video Sources 09-09-2017, 05:03 PM
Replies: 6
Views: 3,247
Posted By midnightg35x
Re: SEM3330, S3330 SMPS IC from Samsung BN44-00697A

I eventually figured enough was enough on this one and just found a complete replacement board for $25. The TV still does not work, but I think I will open a new thread as the title of this thread...
Forum: Troubleshooting TVs and Video Sources 09-01-2017, 10:15 AM
Replies: 6
Views: 3,247
Posted By midnightg35x
Re: SEM3330, S3330 SMPS IC from Samsung BN44-00697A

Well that experiment I think we can call failed (or something else was wrong). Got the chips the other day and installed one. Being in haste probably caused me more damage though. I happen to...
Forum: Troubleshooting TVs and Video Sources 09-01-2017, 10:09 AM
Replies: 20
Views: 1,720
Posted By midnightg35x
Re: Samsung UN55B6000 Relay Clicking

IC1201 is the EEPROM for the DVI or VGA. I had that out of the board for awhile and the TV would still turn on. I did need to replace it because it was shorted, but the TV would still mostly...
Forum: Troubleshooting TVs and Video Sources 08-27-2017, 01:40 PM
Replies: 0
Views: 266
Posted By midnightg35x
LG Main Board Cross Compatibility

I have an LG 55LS4500 TV that has a shorted out main SoC on the main board. It was hit by some sort of power surge. It isn't practical for me to replace just the main IC which controls almost every...
Forum: Troubleshooting TVs and Video Sources 08-27-2017, 12:43 PM
Replies: 20
Views: 1,720
Posted By midnightg35x
Re: Samsung UN55B6000 Relay Clicking

I replaced IC1201 with a new EEPROM 24C02. I also replaced the two TVS arrays on the HDMI1 port. Those TVS arrays are tiny and painful to solder :) Everything works well now.
Forum: Troubleshooting TVs and Video Sources 08-22-2017, 11:57 PM
Replies: 20
Views: 1,720
Posted By midnightg35x
Re: Samsung UN55B6000 Relay Clicking

I put in the new HDMI chip. Unfortunately the supplier gave me a SIL9287A, not SIL9287B. I don't know if that's an issue or not, but the TV still doesn't work. There is still no longer a dead...
Forum: Troubleshooting TVs and Video Sources 08-20-2017, 09:56 PM
Replies: 20
Views: 1,720
Posted By midnightg35x
Re: Samsung UN55B6000 Relay Clicking

I got one from a US supplier and a 5pc from china. One will show up soon and the 5 in a few weeks I suppose. I'll try my hand at QFN soldering soon.
Forum: Troubleshooting TVs and Video Sources 08-18-2017, 10:33 AM
Replies: 6
Views: 3,247
Posted By midnightg35x
Re: SEM3330, S3330 SMPS IC from Samsung BN44-00697A

I went ahead and am trying the aliexpress route. I'll report back if/when I get them and install them.
Forum: Troubleshooting TVs and Video Sources 08-18-2017, 10:31 AM
Replies: 20
Views: 1,720
Posted By midnightg35x
Re: Samsung UN55B6000 Relay Clicking

So I found out what the issue was. IC210 (3.3V regulator) pin 1 output was being shorted to ground. The fact IC1102 got so hot just seems to be a byproduct of this. The component that was actually...
Forum: Troubleshooting TVs and Video Sources 08-15-2017, 11:49 AM
Replies: 20
Views: 1,720
Posted By midnightg35x
Re: Samsung UN55B6000 Relay Clicking

I tried that. Looking at the datasheet for the power pins, there is no way to measure on pin. The pin pitch of that part is .01" There is no way I have a probe that fine to directly measure. All...
Forum: Troubleshooting TVs and Video Sources 08-14-2017, 11:43 PM
Replies: 20
Views: 1,720
Posted By midnightg35x
Re: Samsung UN55B6000 Relay Clicking

Further investigate shows that IC1102 (RTL8100CSL) gets scorching hot on the main board. I have seen this be a problem on some motherboards before, but not on a TV. It is a very fine pitch IC that...
Forum: Troubleshooting TVs and Video Sources 08-14-2017, 11:13 PM
Replies: 20
Views: 1,720
Posted By midnightg35x
Re: Samsung UN55B6000 Relay Clicking

I tried that, but with the same result. There is no wifi on this model though as far as I can tell with a separate module. I'm pretty sure this TV broke as a result of lightning or another surge...
Forum: Troubleshooting TVs and Video Sources 08-13-2017, 11:29 PM
Replies: 20
Views: 1,720
Posted By midnightg35x
Re: Samsung UN55B6000 Relay Clicking

I can get some tomorrow, but in the mean time the shopjimmy ones are probably better than what I can take anyway. The mainboard is BN94-02657X and the power supply is BN44-00271A for reference. As...
Forum: Troubleshooting TVs and Video Sources 08-13-2017, 11:21 PM
Replies: 6
Views: 3,247
Posted By midnightg35x
Re: SEM3330, S3330 SMPS IC from Samsung BN44-00697A

The NCP1203 and FAN6755 look similar, but not pin compatible with each other. Pin 1 on both seem to have different functions. I feel the FAN6755 is a better fit, but if anyone has a better feel for...
Forum: Troubleshooting TVs and Video Sources 08-13-2017, 02:46 PM
Replies: 20
Views: 1,720
Posted By midnightg35x
Samsung UN55B6000 Relay Clicking

I have a Samsung UN55B6000 that has a constant relay clicking on and off. I have looked through some other threads on here about it but I have not come to a resolution yet. If I unplug the...
Forum: Troubleshooting TVs and Video Sources 08-13-2017, 02:34 PM
Replies: 6
Views: 3,247
Posted By midnightg35x
SEM3330, S3330 SMPS IC from Samsung BN44-00697A

Hello,

I am trying to repair a samsung power supply BN44-00697A out of a samsung UN32H5500. It originally blew the main fuse because of a shorted transistor. I replaced all the damaged...
Showing results 1 to 25 of 26

 
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