Re: LG 50PJ550 Clicking
can anyone point me into the right direction to test patterns or maybe jump the main board
Legend pins on Psu are as follows
17V 17V
GND GND
5.1V 5.1V
ERR_DET 5.1V
GND GND
GND GND
STBY STBY
AC_DET RL_ON
AUTO_GND M_ON
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Re: LG 50PJ550 Clicking
Possibly does seem common on these,Leave a comment:
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Re: LG 50PJ550 Clicking
The mark up on these kits are high. Kit for the same auction above is $25 CDN (with current exchange rates).
Aliexpress sells the IC for as low as $1.22 USD + free s/h ($1.64 CDN).
http://www.aliexpress.com/item/Origi...488431640.html
or 5 (Five) for $2.91 USD + free ship.
For those doing a lot of repairs, you might as well order 5 them well in advance so you don't have to wait 30 days for shipping from China.
10 x 22 ohm 5W resistors also sell for $2.29 USD + free ship.
So, through aliexpress, I can get probably 10x of everything for less than the price of one kit on ebay.Leave a comment:
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Re: LG 50PJ550 Clicking
No worries let us know how its goes
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Re: LG 50PJ550 Clicking
Thanks Hamie its shorted
i have ordered 3BR1565JF Regulator and a replacement diode ill change that and see how i get on
@reecey yes i have seen in further posts that IC701 can be faulty as well but ill try this first then move on if not
thanks guysLeave a comment:
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Re: LG 50PJ550 Clicking
Link to repair kit:
http://www.ebay.co.uk/itm/LG-Power-R...-/131027150307
I had one and that Ic was failed however it never blew the fuse. Also the control circuit for that Ic is also prone to failure on these, will find the kit for that.Last edited by ReeceyBurger123; 10-26-2015, 02:24 PM.Leave a comment:
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Re: LG 50PJ550 Clicking
Pin 5 is ground, so put black probe on pin 5 and touch the other pins with red probe.
If any are shorted to ground then it's certainly bad.Leave a comment:
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LG 50PJ550 Clicking
hello
got another tv im trying to fix with just a clicking fault i will upload more pictures soon
i have so far tested the follwoing
1. two 5W22 ohms resistors but they are good
2. D304 is showing as shorted in circuit but ok when out of circuit
3. No Vs or Va from the power supply even with the Ysus and Zsus disconnected
any ideas how to test this part which is a common failure on these power supplys 3BR1565JF Regulator
thanksAttached Files -
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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... -
Hello.
I have seen a short circuit tester made with 3 * 9V batteries, a voltage limiter component and a resistor connected to the probes of a multimeter.
The theory is that the meter becomes sensitive enough to read very low resistances and the lowest resistance to ground on a circuit is likely to be a short circuit in that area.
Link
The Amazing $1 Short Finder Upgraded! Convert ... - YouTube
https://www.youtube.com/watch?v=0eixDdCpiO4
My multimeter isn't normally sensitive to very small resistance, but when I put a 1 mega ohm resistor... -
Hi,
I am repairing a ups which doesn't turn on ,it has the following ICs:
SG3525 used to drive inverter mosfets.
couple of uc3483, one for the power supply and another to drive a big mosfet at the output stage(i think the technique is called boost)
A LM358 and TL074 for control mechanism and of course the uController.
The SG3525 is shutting down every time the ups is turned on.
I want your help to know the function of LM358 and TL074 in the system.
I reverse engineered the LM358 circuit and i think that one of the block(A) is used for battery level... -
Hello. MSI B250 Gaming M3 board, short-circuit on the power supply. Found a problematic mosfet VQ1
(N-PK616BA_PDFN8-HF) soldered it out - short circuit is gone. I replaced VQ1 + VQ5 (N-PK632BA_PDFN8-HF). VQ1 was replaced with PK618. After starting attempt VQ1 is lit again. What can be the problem? In the driver?
Schematic and Boardview here
...04-04-2025, 03:57 PM -
So I have a cheap non working ATX PSU that I was learning to repair a decade ago. At the time, it blew the main fuse, bridger rectifier, NTC, and primary 9A 900V MOSFET. Replaced all except the MOSFET. 5VSB came back online. Then I poked around in it so much, measuring components one by one to a point I accidentally made the 5VSB circuit primary side went bang. Blown the AP8022 (Viper22A) PWM chip, along with a low resistance resistor and the PC817 opto isolator. I replaced them all.
In the process of poking around, I also lost a zener diode that stabilize the voltage coming from...
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