The TV doe snot tun on even though there is standby voltage. With no PS_voltage applied, the DC voltage across the two main caps reads over 800VDC (405 is normal I think with PS_ON and about 130 without the PS_On). The voltage slowly drops away to zero if you leave the DIM connected. Any idea where to start looking? Thanks for any leads.
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Re: Sharp LC-LE830u PS problem
You are measuring one capacitor at a time right?Quit because THIS SITE LETS A ROGUE MEMBER TYPE ANY GARBAGE HE PLEASES AND THE POWERS THAT BE NEVER DO ANYTHING ABOUT IT SO HE NEVER QUITS. THEN YOU GET A PENALTY FOR RESPONDING TO HIS ATTACKS. BEEN GOING ON FOR WAY TOO LONG. DONE SUPPORTING A SITE THAT ALLOWS THIS BS. -
Re: Sharp LC-LE830u PS problem
Please verify that your meter is OK and properly set to the correct mode.
And what did you use for GND ref. for the meter.
Please also upload good clear pictures of the whole backside of the TV showing all the boards, and then the pictures of the TOP and BOTTOM side of the power supply board.Last edited by budm; 02-28-2018, 03:00 PM.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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Re: Sharp LC-LE830u PS problem
Read my old post on this. May have to do the keypad combination. It's on page 3 post 50.
https://www.badcaps.net/forum/showthread.php?t=31895
By the way I never did successfully repair the problem. I ended up selling that T V-2 years ago with the new owner knowing how to start it if it gets unplugged.
On post number 50 I did not mention that you have to hold the 2 buttons while you plug the TV in at the same time
Do you have a flashing indicator on the front of the TV when you plug it in or is it not doing anything at all?Last edited by freakaftr8; 02-28-2018, 03:17 PM.Did I leave the soldering iron on?Comment
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Re: Sharp LC-LE830u PS problem
Yes one at a time. If I apply 3v to PS_on I get all the correct voltages on the main board connector but absolutely nothing in the inverter section. 405 v now on the main caps slowly going back down to 167 (the PS off voltage).Comment
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Re: Sharp LC-LE830u PS problem
So you can force on the power supply using the PS-ON pin but if you do not have PS-ON, BL-ON, DIM control signals when power switch is activated, none of those signals toggle high for second?
BTW, what is the correct model number of this TV?
Requested pictures?Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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This is the zombie UN55NU6900F I wrote about in this original post.
It originally was completely dead with no standby voltage. After some poking around, I found the solder at RM819 (see pictures) failed. I removed it from the board, it tested fine, resoldered it, and now the TV works.
The expected standby voltage at the reference pin is specified to be 11.8V but it's reading 12.8V. Couple questions:
1. What could cause the standby voltage to be 1V higher than expected
2. Is this a problem
3. Could it have led to the failure at RM819, or was that... -
Vizio e601i-A3 - Has Sound and Display, But No Backlight - Bad Power Supply Board or Bad LED Bulbs ?I was given this TV from my great uncle. He said it just wouldn't turn on one day out of nowhere, replaced the TV, and gave it to me to possibly fix and use for myself.
Upon bringing it home and plugging it up, it showed a standby light.
I powered it on and without a flashlight, the display showed the "V" but the lighting is very dim, but visible.
The screen seems to blackout and stay black, but with a flashlight I can see the display.
With my Playstation 4 connected via HDMI, and running a game I can hear sound.
Assuming... -
This power supply is 30v 5amp. Problem is when turned on after about 3 minutes voltage starting to decrease slowly. (like - 5.8 > 5.7 > 5.6 > 5.5) can't see any damaged component or dry solder joints. Checked main 2 transistors with multimeter. Reading seems ok. Tried changing potentiometers(both coarse and fine) still the same situation. Can any one help me to troubleshoot? What voltages to check? Any ideas helps to fix this. thank you.!
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Hello everyone,
I'm trying to fix this SY-5SSM motherboard (Socket 7).
When the PSU is connected it powers on by itself but there's nothing on the POST card, no beeps.
The BIOS EEPROM is ok (latest BIOS was flashed).
All the jumpers are set ok.
All the 1000µF 6.3v (14) and 1500µF 16v (2) caps are in spec.
There are two 76129D MOSFETs (datasheet). I took them out and tested them and they are ok (no continuity from drain to source) in off state.
But the voltage in the gate of the second 76129D fluctuates between 1.468-1.649,... -
I have an LG Plasma TV 60PM6700 for the past ~12 years.
In the last ~3-4 months I have been having some issues.- Problem: It started with random picture disappearing (sound still worked).
Frequency: Happened about once a week.
Solution: Had to turn off TV wait a few seconds before turning it on again. - Problem: Then it got worse and the TV started to shut down and when turning on the no picture just sound.
Frequency: Happened about once a week.
Solution: Had to turn off TV wait about 10-20 seconds and turn it on again to solve. - Problem: TV shuts down
- Problem: It started with random picture disappearing (sound still worked).
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