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Search: Posts Made By: kgavionics
Forum: Troubleshooting TVs and Video Sources 07-27-2020, 07:50 AM
Replies: 3
Views: 265
Posted By kgavionics
Re: Samsung UN55KS8500 - previously power-cycling, now vertical colored bars

Hi
First, can you remove the back cover and take pictures of the TV set, the power supply and the main board!
Forum: Troubleshooting TVs and Video Sources 07-23-2020, 10:40 AM
Replies: 42
Views: 1,278
Posted By kgavionics
Re: Sharp LC-50P66U-completely dead PSU!!

It looks like the mainboard, is not sending any signal back to the PSU.
By the way, this set is poorly designed and even though is branded SHARP, it's actually a Chinese crap made by Hisense!
Forum: Troubleshooting TVs and Video Sources 07-23-2020, 07:56 AM
Replies: 42
Views: 1,278
Posted By kgavionics
Re: Sharp LC-50P66U-completely dead PSU!!

hello Budm and thank you for your help it means so much to me!
I think it was my error for not getting the 16V and 12V!
Regarding, the voltage reading requested in #21 I was getting 18.3 and a...
Forum: Troubleshooting TVs and Video Sources 07-22-2020, 07:45 PM
Replies: 42
Views: 1,278
Posted By kgavionics
Re: Sharp LC-50P66U-completely dead PSU!!

I didn't change anything, but somehow I got the 18.3 on the 16V rail, a fluctuating between 8.3 to 12.3V 12v rail, but no standby voltage!
When I press either on the power button or the on remote...
Forum: Troubleshooting TVs and Video Sources 07-22-2020, 04:25 PM
Replies: 42
Views: 1,278
Posted By kgavionics
Re: Sharp LC-50P66U-completely dead PSU!!

1-Yeah, the booster circuit is working fine
2-I have a fluctuating voltage between (112 to 123V) on the anode and (223 to 240V) on the cathode of V905.sorry I made a mistake earlier by saying I had...
Forum: Troubleshooting TVs and Video Sources 07-22-2020, 02:24 PM
Replies: 42
Views: 1,278
Posted By kgavionics
Re: Sharp LC-50P66U-completely dead PSU!!

i have attached the top and bottom pictures of the old board.
Forum: Troubleshooting TVs and Video Sources 07-22-2020, 12:25 PM
Replies: 42
Views: 1,278
Posted By kgavionics
Re: Sharp LC-50P66U-completely dead PSU!!

I received the power supply board today, but I have the same problem! No output voltage or whatsoever, even with the backlight and main board connectors disconnected!
I have 388V across the main...
Forum: Troubleshooting TVs and Video Sources 07-21-2020, 08:09 PM
Replies: 4
Views: 296
Posted By kgavionics
Re: Sharp Aquos lc-46le810un-Intermittant fleckring!

Problem never appeared after deactivating the ambient light sensor. Thank you very many guys
Forum: Troubleshooting TVs and Video Sources 07-21-2020, 05:59 PM
Replies: 17
Views: 643
Posted By kgavionics
Re: 50uh5500 LED Strip LED type

I have the same tv with the same problem that i bought it for cheap, i ordered a set of backlight from aliexpress, before i even troubleshoot the tv, because this tv model is known bad backlight...
Forum: Troubleshooting TVs and Video Sources 07-20-2020, 02:44 PM
Replies: 42
Views: 1,278
Posted By kgavionics
Re: Sharp LC-50P66U-completely dead PSU!!

Thank budm! I ordered one eBay for $25!
Forum: Troubleshooting TVs and Video Sources 07-19-2020, 10:31 PM
Replies: 42
Views: 1,278
Posted By kgavionics
Re: Sharp LC-50P66U-completely dead PSU!!

Yeah! I'm 100% sure that the IC is faulty, because even I replaced the V802, I still have 165V on the main cap, which indicates that the booster circuit is not working!
I looked on eBay for...
Forum: Troubleshooting TVs and Video Sources 07-19-2020, 08:43 PM
Replies: 42
Views: 1,278
Posted By kgavionics
Re: Sharp LC-50P66U-completely dead PSU!!

I checked PIN2 and hot ground and didn't find a short!so hopefully, the IC is not burnt out!
I checked the value of the R825 on my USB microscope and it's marked 471 which is 470ohms!
I'm going to...
Forum: Troubleshooting TVs and Video Sources 07-19-2020, 07:43 PM
Replies: 42
Views: 1,278
Posted By kgavionics
Re: Sharp LC-50P66U-completely dead PSU!!

Hi
I checked the R825 and found 220kohms, so I'm going to replace it and report back!
Forum: Troubleshooting TVs and Video Sources 07-19-2020, 08:00 AM
Replies: 42
Views: 1,278
Posted By kgavionics
Re: Sharp LC-50P66U-completely dead PSU!!

Sorry, I forgot to mention that while I was troubleshooting the set I accidentally shorted V802 drain and the source which burned the R 826 resistor (0.1 ohms), but I replaced it with a 0.17 resistor...
Forum: Troubleshooting TVs and Video Sources 07-18-2020, 08:41 PM
Replies: 42
Views: 1,278
Posted By kgavionics
Re: Sharp LC-50P66U-completely dead PSU!!

Thank Budm for your input! It's really appreciated!
I'm still trying to find what's going on with this PSU! But, I'm a bit stuck, because I didn't do any modification, but I'm only getting 170Vdc on...
Forum: Troubleshooting TVs and Video Sources 07-18-2020, 02:40 PM
Replies: 42
Views: 1,278
Posted By kgavionics
Re: Sharp LC-50P66U-completely dead PSU!!

Update: I found the PSU schematic!
Forum: Troubleshooting TVs and Video Sources 07-18-2020, 12:19 PM
Replies: 42
Views: 1,278
Posted By kgavionics
Sharp LC-50P66U-completely dead PSU!!

Hi guys
I just got this TV which is completely dead, not a single sign of life!
I have not a single voltage on the output of the PSU!
I checked the fuse which it was ok, I have 385V on the main...
Forum: Troubleshooting TVs and Video Sources 07-12-2020, 12:49 PM
Replies: 8
Views: 302
Posted By kgavionics
Re: Toshiba 32av5000u-help identify resistor

the guy was lucky, because I think, he only replaced the cap thinking it would fix the problem, and since the Mosfet was shorted out and obviously the fuse is open it didn't do anything!
Nowadays,...
Forum: Troubleshooting TVs and Video Sources 07-12-2020, 09:19 AM
Replies: 53
Views: 1,281
Posted By kgavionics
Re: Samsung LA32R81B Not Turning On

Have you tested all the diodes and Mosfets on the 12V and 24V rails?
Forum: Troubleshooting TVs and Video Sources 07-12-2020, 08:42 AM
Replies: 19
Views: 474
Posted By kgavionics
Re: Insignia NSL-42Q-10A no power!

I really appreciate your suggestion, but the board is heavily damaged, I have found a lot of burnt small IC's! I have some other TV's to work on. This card is beyond economical repair!
Forum: Troubleshooting TVs and Video Sources 07-11-2020, 04:45 PM
Replies: 19
Views: 474
Posted By kgavionics
Re: Insignia NSL-42Q-10A no power!

Received the main board yesterday, TV working fine! Thank you guys for all your inputs!!!
Forum: Troubleshooting TVs and Video Sources 07-11-2020, 03:52 PM
Replies: 8
Views: 302
Posted By kgavionics
Re: Toshiba 32av5000u-help identify resistor

Update:
Replaced the Mosfet with more capable one, that I took out from another power supply, replaced the fuse and when I turned on the TV, the main Tank capacitor blow up! and i had my room full...
Forum: Troubleshooting TVs and Video Sources 07-11-2020, 07:07 AM
Replies: 8
Views: 302
Posted By kgavionics
Re: Toshiba 32av5000u-help identify resistor

Thank you budm for the heads-up!
I uploaded the top and bottom of the Power board! (the resistor and the Mosfet are removed)
Forum: Troubleshooting TVs and Video Sources 07-10-2020, 10:18 PM
Replies: 8
Views: 302
Posted By kgavionics
Toshiba 32av5000u-help identify resistor

Hello guys
I'm trying to fix a Toshiba 32av5000u with apparently a power supply problem.I found a blown fuse and shorted Mosfet (Q601), I found the resistor R621 shorted out.I didn't find any...
Forum: Troubleshooting TVs and Video Sources 07-04-2020, 08:55 PM
Replies: 4
Views: 253
Posted By kgavionics
Re: Vizio 55" M550SL No volume up or down

We need more information. Does the volume bar shows when you change the volume?
Showing results 1 to 25 of 128

 
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