Hello, I have a problem with the PSU of the TV Haier 50 "same PSU as the Sansui model STY095 and other Models, I have replaced all the LEDs, two mosfet aod4286, check resistors, checked filter / inflated capacitors and nothing. Measuring voltage on pin 3 of the ic ap3041 I have 1.65vdc, but I miss that when I place the tip of the fluke the LEDs turn on, thinking that it would be a false contact, I rectified the welding but the problem continues.On the board is present 5, 12 vdc but I have raised the 30vdc to 33vdc. Any other help would be welcome to solve the problem.
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Re: PSU fault KPL-L01 IC AP3041 TV Haier 50 "Mod 50YAC
Please upload good clear pictures of the whole backside of the TV showing all the boards, also good clear straight shots of the whole top and the bottom side of the power supply board.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: PSU fault KPL-L01 IC AP3041 TV Haier 50 "Mod 50YAC
What voltage do you have on Pin 5 of th AP3041. The maximum voltage at that pin should not exceed 27V.Willing to help but I'm no expert.Comment
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Re: PSU fault KPL-L01 IC AP3041 TV Haier 50 "Mod 50YAC
I have also checked resistors, capacitors, schottky rectifier diode, but the output voltage is not 30 if not 33.1 v, today I will test the 817c optocouplers and also the TL417 with a tester that I observe online.Comment
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Re: PSU fault KPL-L01 IC AP3041 TV Haier 50 "Mod 50YAC
Today I started testing the LED strips again to discard if there were failures in the strip and take a chance, with a LED driver that I have from my old Aquarium I managed to turn on the 68 LED strip (divided into 4 sections of 17 LEDs each section and 4 led + and 4 led cables-) placing the multimeter in amp scale and the total consumption was 0.133 A or 133 mA, I managed to rule out that the total consumption of the LEDs does not exceed what the 280 mA card marks, now , seeing that the problem is the inverter of the source, when turning on the source without being the connector of the LEDs in the source, the voltage that measured with LEDs + and LEDs- was 82 vdc and decreases. What I could think of two things the source is sending too much voltage to the LEDs and it is protected (although the source says 30 to 120vdc) but when the LEDs are connected it has 51 vdc flashing the LEDs the protection is activated by decreasing the voltage. Or you have damaged AP3041 IC or some component (I would like to know which one) is not working properly.Attached FilesComment
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Re: PSU fault KPL-L01 IC AP3041 TV Haier 50 "Mod 50YAC
The voltage on Pin 5 as per your reply in post 5 is correct as per the data sheet you provided. The supply voltage VCC is well within the operating range of the IC.
The data sheet also says that Pin 16 (FAULT) is 0 volts when the output is in short circuit condition.
You also say "but when the LEDs are connected it has 51 vdc flashing the LEDs the protection is activated by decreasing the voltage."
So are the backlights flashing when you switch on. If so if you reduce the backlight level (not brightness) in the menu, does the flashing of the leds slow down?Willing to help but I'm no expert.Comment
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Re: PSU fault KPL-L01 IC AP3041 TV Haier 50 "Mod 50YAC
Sorry Pin 16 is the Flag indicator pin not Fault Pin as I said earlier. See data sheet.Willing to help but I'm no expert.Comment
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Re: PSU fault KPL-L01 IC AP3041 TV Haier 50 "Mod 50YAC
Hi Dick, thanks for answering, when I turn on the TV is that it flashes only once the LEDs, it is not flashing continued. When you mention that I entered the menu to regulate the level of the Backlight, I commented that I did not enter the service menu for two reasons first I do not know how to enter the menu and second that I do not know what parameters changed, I should check the main to verify how enter, since, this tv is a hybrid, distributed by Haier, made by Leader (another Chinese brand that I have no information about it).Comment
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Re: PSU fault KPL-L01 IC AP3041 TV Haier 50 "Mod 50YAC
To take off this headache, better buy a Universal inverter.Comment
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Re: PSU fault KPL-L01 IC AP3041 TV Haier 50 "Mod 50YAC
Disconnect the led connector and check the voltages you have on CN3. Connect you meter to the pin and chassis and then switch on. The voltage should peak at switch on and then drop very quickly. Does you multimeter have a min/max function?
I suspect you may have a led problem. Leds can breakdown when the current through it increases although they appear to be OK at lower currents as you have already tried.
Edit
I just read your post again which says, "the voltage that measured with LEDs + and LEDs- was 82 vdc and decreases."
Normally when the voltage peak and then drops is often linked to an led(s) problem.Last edited by dick_barton; 01-15-2020, 12:26 PM.Willing to help but I'm no expert.Comment
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Re: PSU fault KPL-L01 IC AP3041 TV Haier 50 "Mod 50YAC
LEDs externally tested with Drivers.
Vdc: 47.7
mA: 0,155Attached FilesLast edited by alextuning15; 01-17-2020, 04:43 AM.Comment
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i have replaced many leds strips that have changed blue when they are worn
and the new replacements are perfect white
but when fault finding do quantum leds always look blue? -
Hi there !
I'm having an issue for several weeks with my quite old K70 LUX RGB keyboard. I haven't used it for few months, and once I setup up again my desktop computer, I got several dead LEDs on that keyboard. I tried the Corsair troubleshooting thing (disabling options in iCUE, ...) but nothing changed so I conclude that for some reason some LEDs went in retirement...😅
Decision taken to change these LEDs as I have access to desoldering iron and binocular magnifier, I wrote a ticket to tech support, hopping to obtain the LEDs reference and... They refused to tell me 🙄...10-08-2024, 11:58 AM -
Hello everyone. 😀
As per thread title, this unit has a serious SMPSU fault. It blows F1001, which is a 10A M205 in the phase from the mains input.
Very first thing I tried, was simply replacing the fuse, but the replacement ceramic fuse blew immediately.
Looking at the schematic for this PSU, I then removed what I thought was the next likely candidate: D1001 - the HV main bridge rectifier.
This isolated the fault(no longer blows the main fuse), but does not point me to the actual fault.
There are no devices that have exploded or otherwise show signs... -
- Prior owner tried a replacement main board. No difference.
- Samsung 2x red blinking standby LED = panel fault
- Jumpered FB_TRDY_1 (pin 1 CN1300 left. main tcon->left side buffer boards) and FB_TRDY_3 (pin 95 CN1301 right. main tcon->right side buffer boards) This allows testing individual T-Con (on main board) connection to panel on this Samsung. Found fault on left side (viewing from rear of TV)
- Each side has 2 buffer boards, disconnected left side flex between 2 buffer boards. Fault is on the left most board.
- Tape masking eventually isolated to CN1300 pin 15 (CKV4_GOA) Display
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I have been having a fun time at work with two pieces of equipment that had shorted components or shorted component cables to machine frame
I would check what my multi meter was telling me about how many ohms I getting with the multi meter was telling versus the ESR was telling me about weather or not it really was a short to machine ground or not
One note at first we thought that it might be a bad I/O card or a malfunction PLC including me as well but I thought I would try and see if removing the I/O cables would make a difference or not and this time it did make a difference...
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