HI
Friend of mine has a LG TV 50PM6700 that has a number of issue,
1. when the TV is turn on (Working played video from HDMI )after a couple of minutes it makes a screeching noise that comes from the internal speakers and the TV appears to freeze on a blank screen.
2. Switching the TV on and off immediately LG logo comes on but TV appears to still be frozen won't respond to button on TV except Power.
3. When completely disconnected from Power and left for a couple of minutes and switch back on it will do a repeat of step one so will work for a couple of minutes...
Blunttag
Member
Last Activity: 12-10-2022, 02:14 AM
Joined: 06-02-2022
Location: sydney
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LG 50PM6700 screeching noise from speaker
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Re: Apple Macbook Air A2337 not charging
I end up returning the laptop to my cousin in a semi working state, I Like to thank mon2 for the help they provided in trying to diagnose the issue and hope that the diagnostic step in the thread help other people who have the same laptop and are having similar issues.
Thanks for the help and i really appreciate mon2 taking time to help with the issue. -
Re: Apple Macbook Air A2337 not charging
Rechecked the voltages for CHGR_AUX_DET
adapter connected :5V
adapter Disconnected:0VLeave a comment:
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Re: Apple Macbook Air A2337 not charging
Hi
I assume the battery has to be connected to test this
Plugged in voltage around 4V +-0.5
not plugged in Voltage is 0.02V
Also the USB-C power meter arrive so i can check what it is drawingLeave a comment:
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Re: Apple Macbook Air A2337 not charging
Not sure if i did it correctly but was not able to find a good location to check the resistance so i went with what was close
CHGR_CSO_FILT_P C5261 Pin 1 - R5262 pin 1 = 1.4 ohms
CHGR_CSO_FILT_N C5262 Pin 1 - R5261 Pin 1 = 1.4 ohmsLeave a comment:
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Re: Apple Macbook Air A2337 not charging
My Hot air station max out at 500c was not able to remove the mosfet
also borrow a 61W apple charger and the gate was 12V
what you mean by feed back loop (sorry if dumb question) and what is the current sense resistor? is it R5260Last edited by Blunttag; 10-31-2022, 10:50 PM.Leave a comment:
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Re: Apple Macbook Air A2337 not charging
Having difficult removing it what the max safe temp i can use?
Atm i'm at 400'c for 20sec and its not budging with flux also on it.
Tested on a Practice board and the SMD came off is the solder on Apple board require a high temp to remove?
Also rechecked Source (1-2-3) & drain (5-6-7-8) with a different Multi meter and getting 10M + OhmsLast edited by Blunttag; 10-30-2022, 11:58 PM.Leave a comment:
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Re: Apple Macbook Air A2337 not charging
Gate voltage is 3.69V with battery disconnectedLeave a comment:
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Re: Apple Macbook Air A2337 not charging
With battery disconnected
Pin 1:11.99V
Pin 2:11.99V
Pin 3: 3.26V
Pin 4: 3.26V
Pin 5: 0V
Pin 6: 0V
Pin 7: 0V
don't have a USB-C power meter (ordered one waiting for arrival) so don't know what come from the adapterLeave a comment:
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Re: Apple Macbook Air A2337 not charging
PPBUS_AON:11.99V
Source (1-2-3) & drain (5-6-7-8) :100K Ohms
Source (1-2-3) & gate (4) : 15M Ohms
Gate (4) & drain (5-6-7-8) : 15M OhmsLeave a comment:
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Re: Apple Macbook Air A2337 not charging
Pin1,2,3 all connected :11.99V
Pin4: 12V
Pin5: 11.28VLeave a comment:
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Re: Apple Macbook Air A2337 not charging
Hi do you mean Q5265? as there does not appear to be a Q5625 mosfetLeave a comment:
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Re: Apple Macbook Air A2337 not charging
Ok measured at the battery connector terminal
plugged in
pin 1:11.29V
pin 2:11.29V
pin 3:3.26V
Pin 4:3.26V
Pin 5: 0V
Pin 6: 0V
Pin 7: 0V
Battery only
pin 1:11.13V
pin 2:11.13V
pin 3:3.26V
Pin 4:3.26V
Pin 5: 0V
Pin 6: 0V
Pin 7: 0V
Not sure if this make a difference but i also checked if there was a short on Pin 5 and there is a short to ground on pin 5 while laptop is offLast edited by Blunttag; 10-29-2022, 05:35 PM.Leave a comment:
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Re: Apple Macbook Air A2337 not charging
Yes it does decrease also here is the link to the schematic
[url]https://www.badcaps.net/forum/showthread.php?t=95985&highlight=a2337[/url]
But it won't open in openboardviewRe: Apple Macbook Air A2337 not char... openboardviewRe: Apple Macbook Air A2337 not charging
Yes it does decrease also here is the link to theLast edited by piernov; 10-29-2022, 03:33 AM.Leave a comment:
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Re: Apple Macbook Air A2337 not charging
Laptop belongs to my cousin but yes i believe everything was working before and the same USB cable was used, and i tested with a different USB-C charger a HP 65W and the same thing happened plug in turns on but still say not charging and i believe the fault just occurred recentlyLeave a comment:
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Apple Macbook Air A2337 not charging
Hi I am not sure if the issue is the battery or something else original the mac book air was not turning on, so i opened it up and removed the battery, the machine turned on without the battery connected so i order a replacement battery, installed it and now the laptop turns on with the cable connected and without the cable connected but it seem to be stuck at 22% with "battery is not charging" i have turned off battery optimized charging and am using the original apple 30W charger USB-C charger.
Does anyone have an idea what the issue could be? -
Re: Lexmark E260DN Error
removed the controller board and what do i find cockroach dropping all on the back side.
so what you think? should i just trash this printer and not bother to try to repair?...Leave a comment:
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Re: Lexmark E260DN Error
Also did a main motor service check and J17 pin 7-9 register 13-15V different to the 18V and 24V in the service manualLeave a comment:
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Re: Lexmark E260DN Error
ok so i did the controller board service check and when it got to checking the lvps/hvps pin 4 is the only one that failed with a voltage of .6V I also did a dead machine service check which is test on the LVPS/HVPS side and Pin 2 voltage was in the mV range and Pin 4 was .6V so i think we might of found the problem.
Also Please see enclosed Pictures of the Power Supply....Leave a comment:
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Re: Lexmark E260DN Error
that the funny thing is i don't think there is a motor according to the schematic for the wiring diagram it goes straight from TAT201 to the transfer roll
i did get a reading on TAT201 and 0.4V...Leave a comment:
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