Re: VZ42L No Amber light, no stand by 5v
That's all I have done so far
That's all I have done so far
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Re: VZ42L No Amber light, no stand by 5v
That should be enough to run the IC, orientation is correct for sure. Look at the output pin7? which drive the Gate of the PFC MOSFET to see if it has any voltage there.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: VZ42L No Amber light, no stand by 5v
Ok pin 7 to ground? With pson correctComment
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Re: VZ42L No Amber light, no stand by 5v
ok I have 10.90 Volts output but the strange thing is I have a 10.90 voltage drop across the first resistor off of pin 7? I have 10.90V at the lead edge of the SM resistor and 0 volts on the other side.... THe thing I also just realized is there are multiple other resistors that have no continuity across them!!Comment
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Re: VZ42L No Amber light, no stand by 5v
It would be helpful to see the position of these resistors you refer to.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: VZ42L No Amber light, no stand by 5v
Ok this one is measuring 8.5M ohm
I realize now that the other ones just dont wrk on coninuity setting and if you use ohm setting the do register a value I apologizeAttached FilesComment
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Re: VZ42L No Amber light, no stand by 5v
I believe it is has 100 printed on itComment
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Re: VZ42L No Amber light, no stand by 5v
OK I replaced the resistor with one I had and the cap did shoot up to 400V and the Tv was making a whining type noise. It ended up blowing my main fuse when the voltage reached 400 but I was only using a 5amp fuse (temp until rest of my order comes in)Comment
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Re: VZ42L No Amber light, no stand by 5v
OK, I looked the board lay out, pin 7 (Gate drive) is connected to R820, this resistor is connected in series with R806, this R806 is then connected in series with R822 (basically these 3 resistors are connected in series), R822 is connected in parallel with Gate discharge Diode D807 and then feed the Gate of the MOSFET Q801. Since the resistor is damaged, it means that the MOSFET was damaged (Drain to Gate shorted out that it is blown open by now) and dumped about 380VDC into the output pin 7 of the PFC IC. I cannot read the value of those resistors, the Diode D807 mat be damaged also.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: VZ42L No Amber light, no stand by 5v
Wow ok I can take it to work and look under scope to get the values... SO basically I should replace R820,R806 R822 D807 Q801Comment
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Re: VZ42L No Amber light, no stand by 5v
Is there a way I can test Mosfet just for future reference and to verifyComment
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Re: VZ42L No Amber light, no stand by 5v
Also is there anything I can check after the FET to make sure nothing else was damagedComment
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Re: VZ42L No Amber light, no stand by 5v
I would check the PFC diode - near the FET - just in case that caused the original fault.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: VZ42L No Amber light, no stand by 5v
R824 needs to be check also. Since D807 is in parallel with R822, it will not readout correctly, you will have to remove it off the board.
You can check for shorts on all 3 legs combination. Real function test will be an active test by using power supply, LED for indicator, resistor.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: VZ42L No Amber light, no stand by 5v
I feel like its bad i believe it is showing it's flowing both ways in diode check mode 1 direction measures .686v the other which i thought should be overload measures -.868 or something close to thatComment
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Re: VZ42L No Amber light, no stand by 5v
I am sure it is bad since 13V power supply cannot damage the Gate drive circuit like that, it had to be High voltage from the Drain to Gate that caused the damage to the resistor. I should have told you to check those resistor but from the pictures I did not see any blown up resistors in the Gate drive path.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: VZ42L No Amber light, no stand by 5v
Yea its strange the one that is blown for sure the 10 ohm looks completely fine until you pull it out and measure it Thanks so much I plan on ordering these parts soonComment
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Re: VZ42L No Amber light, no stand by 5v
I usually tell people to change the IC and the MOSFET at the same time and check the Gate drive resistors/Diode network, I am sorry I did not tell you that. Might as well take a close look at C816 which is in parallel with the Source Drain to see if it has any burnt sign.Last edited by budm; 09-18-2013, 07:31 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: VZ42L No Amber light, no stand by 5v
Oh no problem I'm very excited to be learning this stuff. I will let you know when my parts arrive again thank youComment
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Re: VZ42L No Amber light, no stand by 5v
Ok I replaced the diode and the blown resistors now I am just waiting for MOSFET to ship. In the meantime can you explain the good method of checking mosfets ? I have a breadboard and resistors and LEDs. I would like to know processComment
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Hi, this is my personal laptop, which the original board (lets call it Board A) blew up PU8700 (TPS51486), making a hole on the board, i had left the laptop at my desk one day with the battery fully charged and didn't touch it for a week, but when i tried to turn it on it didn't
Thought the battery was dead, so i plugged in the charger then tried to power on, the power LED blinked once, charged LED still orange, unplugged the charger, plugged in again and I noticed the "magic smoke" smell, so i unplugged the charger, removed the back cover and saw the blown IC (the "magic... -
Problem
This is an LG edge LED lit LCD Display. The LEDs are on the bottom edge of the display. There are 2 bars (left and right) Each bar has many LEDs and a 6 pin connector. Each pin drive several LEDs thus is the highest current flow / heat junction. The weak lead free solder gradually fails with thermal expansion/contraction cycling and increases resistance. PSU will compensate up to a point, then when the current is too high, PSU just shut down the backlight causing a dark display. I have even seen one which the connector just fell off as solder points became completely detached.... -
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... -
All left and right refers to looking from rear of TV (or looking from front with TV upside down)
- TV came with vertical bars and no image. Found faulty TVS on left buffer board. Also replaced T-Con (may have damaged the original while hot air removing components, board has slight warp) and have full image but few horizontal lines on the screen. Some of the lines appears to be 2 pixel tall while others are 1 pixel tall.
- Disconnecting left and right buffer board potentially reveals problems on both sides with different signals (unless this T-Con require jumper like Samsung FB_TRDY1&3) Fault
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My Oled Tv is 55inch tv, 3 days ago I notice that middle of the screen is getting warmer and on picture I have ghosting, missing red color. Color red was still displaying, but it was not so strong as corners of the screen and watching some movies makes me angry.
Then I get an idea to take it apart and clean boards from dust.
In side of Tv was not so bad, I take compressed air in can, and gently blow up.
Also I was thinking to styrofoam sponge to isolate power board from screen that the middle of the screen will not worm so much. Because Led on screen when gets higher...
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