Re: LG 42LV3500 trips circuit breaker
it is the same board as shopjimmy.
it is the same board as shopjimmy.
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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=24809 -
Re: LG 42LV3500 trips circuit breaker
Yes both I know its the same board but it wont have any indications of problems.
Its my own fault - I usually check before I start but it was a quick look before tea
and didnt read all the thread - just scrolled up to the pics. Sorry for sounding off just annoyed with myself I suppose.Please upload pictures using attachment function when ask for help on the repair
http://www.badcaps.net/forum/showthread.php?t=39740Comment
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Re: LG 42LV3500 trips circuit breaker
I had time to take a shot of the IC. Here it is:
https://cdn.badcaps-static.com/pdfs/...a5e745a1f3.pdfAttached FilesLast edited by tibimakai; 01-10-2014, 07:25 PM.Comment
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Re: LG 42LV3500 trips circuit breaker
OK, take the resistance reading between Ground pin against all other the pins of the IC, then take DC voltage readings of all the pin with ref to the ground pin (or the negative legs of one of the two small filter caps for this stby section).Last edited by budm; 01-10-2014, 07:44 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: LG 42LV3500 trips circuit breaker
Vcc fluctuates a lot. I see from 10.xV to 17.xV fluctuation.
There is no short or low OHm resistance, between any of the pins.
Pin #4 it oscillates a bit and keeps rising slightly.
Pin #1= 0V
Pin #2= 4.98V
Pin #3= 0V
Pin #4= 0.044V ~ & rising slightly
Pin #5= 163V
Pin #7= 10.xV-17.xV
Pin #9= 0VComment
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Re: LG 42LV3500 trips circuit breaker
Try changing the startup cap, it should be connected to the VCC pin of the IC.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: LG 42LV3500 trips circuit breaker
Good idea, I will do that. Thank you.Comment
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Re: LG 42LV3500 trips circuit breaker
That capacitor it was good, but I have replaced it anyway. Didn't fixed the issue.
What is weird, that if I measure Vac, it shows a constant 6.5Vac.
One of the diodes could be bad?Comment
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Re: LG 42LV3500 trips circuit breaker
Any other ideas?Comment
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Re: LG 42LV3500 trips circuit breaker
If startup capacitor doesn't fix it replace the IC.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: LG 42LV3500 trips circuit breaker
I have replaced the IC, but it didn't help.
I'm measuring a 0.4-0.5V at standby with some oscillation.
The Vcc at the IC it's still oscillating as before.
I have measured 4.5V and 3.7V at the primary side of the optocuplors, but only 0.4-0.5V at the secondary side. Not sure what it means, but I thought that I should mention it anyway.
Any other ideas?Comment
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Re: LG 42LV3500 trips circuit breaker
Any more ideas?
Why would the Vcc for the IC would fluctuate?Comment
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Re: LG 42LV3500 trips circuit breaker
I'm reading this ICs datasheet and I have found this:
"The Control Unit contains the functions for Active Burst
Mode and Auto Restart Mode. The Active Burst Mode
and the Auto Restart Mode both have 20ms internal
Blanking Time. For the Auto Restart Mode, a further
extendable Blanking Time is achieved by adding
external capacitor at BA pin. By means of this Blanking
Time, the IC avoids entering into these two modes
accidentally."
It could be that capacitor is bad?Comment
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Re: LG 42LV3500 trips circuit breaker
When the power is first applied to the circuit, the start up cap will get the charge up current through the Start-up cell which is connected through the D pin of the SMPS IC, once the voltage on the start up reaches 18V for the turn threshold (10.5V for shutoff threshold). The burst mode during power saving just to keep the circuit alive when the load is light load (in standby). So try having a load (1/2A) connected so it will not kick in the power saving mode. It seems to me that it is trying to start but the VOLTAGE from the AUX winding of the transformer for keeping it running is not there. The Resistor Cs is OK?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: LG 42LV3500 trips circuit breaker
It seems like it's turning on and off. It's in this cycle.
I will have to check that resistor.Comment
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Re: LG 42LV3500 trips circuit breaker
Try having the load connected.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: LG 42LV3500 trips circuit breaker
I don't understand, which load?Comment
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Re: LG 42LV3500 trips circuit breaker
Load at the output for this power supply section.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: LG 42LV3500 trips circuit breaker
Should I add a bulb?Comment
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Re: LG 42LV3500 trips circuit breaker
I think budm means board connected as usual, e.g. main board and LED backlight.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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Hello. I had a good monitor AORUS AD27QD. Yesterday when i was sleep i left monitor on like always. When i woke in morning there was not power in house. Something tripped breaker/fuse.
When i turn up breaker and power back in,monitor just refused to turn on. So monitor i guess tripped breaker somehow and make short circuit.
PC starting normally. Only monitor get damaged.
During night only pc was running and monitor. Other devices was off.
Is this possible that monitor can trip breaker? -
while I was gone today the women called me and said the a/c isn't working and the breaker is buzzing so she turned off the breaker. The a/c is a old 1993 model York so its nearing the end of its days, on really hot days the a/c will trip the breaker.
I visually checked the cap and contactor and they looked okay, I also pulled the 250v ac fuses and switched the main ac breaker on and got no buzz. I did get buzz when I put the ac 250v fuses back in and flipped on the breaker nothing but buzzing. could it be a shorted wire or did the circuit breaker just finally give up the ghost?... -
Hi guys
I have this ETA 3120-F321-P7T1-R14XB3 Circuit breaker from a Hill DX3000 Power Amplifier.
The first problem I found with the amp was a faulty 25A Bridge rectifier FB2506 that was short circuit on one leg AC to negative
I've replaced that but the amp has no power. That is because the ETA circuit breaker is open circuit on one pole. The other pole switches OK. The primary of the transformer seems OK (not short or open and doesn't look distressed) so I think that ETA circuit breaker is the only other problem I need to fix.
Problem is finding... -
Hi friends of electronics
What you see in the video and pictures attached is the circuit for charging the batteries of a DC motor.
The problem is that this circuit cannot charge the batteries (3 1800mAH NiMH batteries) any more. When the circuit was OK, its green LEDs lit up one at a time to show that the batteries have charged more. But now that the circuit is flawed, LEDs light up as you see in the video and at the same time successive beeps are heard.
Please help me fix this circuit.
(the datasheet of the IC: https://pdf.datasheet.live/28... -
Have above ATX power supply from a friend. Symptom is tripping home circuit breaker (however, internal fuse seem good).
1. Initial trouble shooting found input AC Live and Neutral lead is 0.02ohm. finally traced to FET Q301A shorted. It is a 5R199 N+channel FET. I replaced both Q301A and Q301B to 20N60C3.
2. Short circuit condition for input circuit is now fixed. However, the PSU still cause home breaker to tripped (fuse in PSU still good, quite surprised).
I failed to understand what else can cause a tripped to home breaker as clearly the current ahould be quite high...
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