When backlight 5v signal is applied,tv shuts down and goes into protect mode. When 5v backlight signal is removed, tv stays on with image and sound.
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Re: RCA led65g55r120q power supply problem
Need good clear straight on pictures of back of tv with cover off and each board.
Need voltages from connector that goes from power supply board to main board. Will need pin#- PIN DESCRIPTION -Pin voltage in standby-Pin voltage when pushing power button and picture of connector on power supply board.
Format:
Pin# - Pin Description - Pin Voltage standby - Pin voltage power on
1 - XXXXXXX - XXv - XXXv
2 - XXXXXXX - XXXv - XXXv
3 - XXXXXXX - XXXv - XXXv
4 - etc.I assume no responsibility for any stupid suggestions I might post. -
[QUOTE=dskall;741874]Need good clear straight on pictures of back of tv with cover off and each board.Last edited by Electechj; 04-22-2017, 09:23 PM.Comment
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Re: RCA led65g55r120q power supply problem
Power board - backlight 5v signal connected
Pin # 1. 24v , standby = 0v , power on = 24v then drops to 0v
Pin #2. 24v, standby = 0v,power on = 24v then drops to 0v
Pin #3 & #4 = gnd
Pin #5,#6 & #8 = 12v ,standby = 0v, power on = 12v then drops to 0v
Pin #7,#9,#10 & #11 = gnd
Pin #12,#13 & #14 = 5v, standby = 0v, power on = 5v then drops to 0v
Pin #15 = PS , standby = 0v, power on = 2.8v then drops to 0v
Pin #16 = 5vs ,standby = 5.1v ,power on = 4.9v then drops to 1v and then back to 5.1v
Pin #17 = ADJ , standby = 0v, power on = 4.8v then drops to 0v
Pin #18 = BK ,standby = 0v,power on = 1v then quick drop to 0vAttached FilesLast edited by Electechj; 04-22-2017, 09:48 PM.Comment
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Re: RCA led65g55r120q power supply problem
Pin #16 is your standby dropping to 1v?I assume no responsibility for any stupid suggestions I might post.Comment
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Re: RCA led65g55r120q power supply problem
Yes , this happens on shut down/protect mode. Then it goes back to 5.1v. Delay/dead time it's at 4.9v. Backlights flash on shut down.Last edited by Electechj; 04-22-2017, 11:28 PM.Comment
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Re: RCA led65g55r120q power supply problem
Need to add there is no 24v hookup so no 24v supply line. Couldn't edit post , is the reason for this messageComment
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Re: RCA led65g55r120q power supply problem
https://www.badcaps.net/forum/attach...4&d=1492918162
See that small lytics startup/running cap on the right side (STBY power supply section) right next (touching?) to the heatsink, check ESR/CAPACITANCE or replace it.
Also check ESR/CAPACITANCE the filter cap in the cold side of that STBY power supply 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: RCA led65g55r120q power supply problem
Thanks for your help . I did some test and found these voltages on the backlight/ADJ circuit . I found 1.5v on the backlight optocoupler PFC/cold side and .7v on the ADJ optocoupler . Hot side backlight optocoupler was 16.8v and ADJ hot side was .3v . Checked and changed the electrolytic on the ADJ optocoupler with no change.Comment
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Re: RCA led65g55r120q power supply problem
The standby power supply should never drop in the first place, so until you get the standby power supply to be stable first then nothing else matter. When standby power supply drops to 1V then all the control signals will drop, same for the Voltage generated by the AUX winding of the standby power supply to run other SMPS IC for other power supply section. You need to put dummy load on the standby to see if it can handle the load or not.Last edited by budm; 04-24-2017, 09:02 AM.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: RCA led65g55r120q power supply problem
Can you get number of your controller chip on backside near small transformer. Looks like 8 pin ic.I assume no responsibility for any stupid suggestions I might post.Comment
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Re: RCA led65g55r120q power supply problem
I will do a load test tonight had to work late today.
The pfc # is ap4310amComment
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Re: RCA led65g55r120q power supply problem
Did a 5v load test with BK connected and disconnected, on and off condition. At first the florescent light stayed on then when power on into shut down light went off then back on then back off then back on .......
It then went on and off in stby . Looks like a bad stby supply.Attached FilesComment
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Re: RCA led65g55r120q power supply problem
Turns out the problem was a regulator and a blown L.E.D . Voltage flash on led output was 82v and 34v (regulator). After replacing regulators voltage read 283v and 147v. The 283v told me no load was connected ,therefore burnt L.E.D.Comment
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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... -
I have wanting to do this project for quite sometime now and I finally found a switching power supply that will work on this desoldering gun station ZD-915 that the original switching power supply took a shit and just was not worth trying to fix it because this switching power is not quite big enough to handle the heater element and the vacuum pump
One note when I tested the switching power supply and the voltage control board I noticed that this desoldering gun heat up much faster than the original switching power supply which I was really surprised by to the point that I might buy... -
I have been working on this concept for quite some time now with limited success but recently I found a switching power supply that is setup for the voltage that this soldering station needs to operate at however it also needs part of the secondary circuit from the original switching power because you need several voltage rails
I once tried to get a ZD-915 desoldering station to work on a 18 volt battery power supply but unfortunately things did not go well but I did find a work around but I might try this idea again but going at a little differently more about this another time... -
The sub developed a constant popping every couple seconds from woofer and power LED flickering with nothing but wall AC connected. Connecting an audio cable didn't change anything. It doesn't play but a second or two of audio in between the pops.
Opened it up and discovered the power supply is making a faint clicking or ticking sound.
I measured the amp's output to the woofer and it pulses up to 50mv DC to be driver. The pulses coincide with the power supply ticking/clicking.
I measured the power supply output going to the amp board and it too has this pulsing. Voltage cycles... -
I have a 15 - inch Retina MacBook Pro from the mid - 2014 model. Here is the link: https://www.badcaps.net/forum/showth...light=820-3662 . The battery broke some time ago. After I removed the battery and plugged in the original power adapter, the MBP could boot up normally. However, when I checked with IntelPowerGadget, I found that the CPU speed was limited to 0.8 GHz, and it ran very slowly. Later, I found a solution on GitHub. There is an open - source project called cputune that can set the CPU running speed. So I can now run the MBP at full speed. But another problem...
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