Hope everyone is doing well here. I have been troubleshooting on why my charger isn't giving any charge. At the TNY IC, I did a volt test on pin 2 with closest capacitor ground lead and it is giving 0 volt. Pin 4 and ground is giving around 2v. The capacitor is getting 160v from what I can tell. Those big diodes are tested on board. I don't find any shorts. Do you know how else I can find the culprit? Please bare with my lack of skills.
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The “TYN” ic chips have a very high failure rate so I would recommend replacing and replacing the capacitor next to the switching power supply transformer and next to TYN ic chip
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The TNY277 is very likely bad, and L1 coil is likely open as well, also change C4. C2 doesn't look that good in the picture so I might just change C1, C2 & C4Last edited by R_J; 08-29-2024, 09:21 PM.Comment
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Laptop Question
Hello,
I'm working on a Lenovo T460 that has been having trouble charging as of late. Its worked well since I've owned it for a few years. When I went to use it the other day it was dead and wouldn't turn on (was sitting on an Anker 65W GaN charger). After some fiddling with the charger I got it to turn on and start charging, but seemed like the charger was not working as it should (took a few plug and unplug cycles to get it to start charging).
A day later it was dead again and wouldn't boot/charge no matter what I did. No lights or anything when... -
The ISL88739 & ISL88739AHRZ are a highly versatile combo battery charger
configurable for operating as either a Hybrid Power Boost (HPB)
charger or a Narrow VDC (NVDC) charger, supporting 2-, 3-, or
4-cell batteries. Both configurations allow the battery to work with
the adapter together to supply the system load when it exceeds
the adapter capability, referred to as system Turbo mode. HPB
charger configuration reverse-boosts battery energy to the system
bus to help the adapter provide the system power in Turbo mode.
NVDC charger configuration...11-05-2024, 03:28 PM -
Hi, I have a Dell Inspiron 7567 LA-D993P that I've just got running.
There was corrosion around PU1503 which shorted PC1518 & blew PL1504. (Reference pictures attached)
I've replaced PC1518 & PL1504 & the laptop is now running however I now have another issue.
Here are the tested scenarios:
1. With the laptop running on battery, I plug in the 150W charger & the charger shuts off (no LED, protection mode) but the laptop remains running on battery.
2. With the laptop off, plug in charger (LED says on) & the front charging... -
Hello, I received this laptop with the following condition: When I turn it on, it shows the ALIENWARE light and the Alien button lights up, then it does not show an image and it restarts constantly, as the customer had already informed me that the battery was dead, I connected an original charger that I had it for testing, the machine turned on normally and I was able to enter Windows without problems, after a while of testing I noticed that it is very slow (like a Cyrix 425...), and after performing a CPU test the frequency is
below normal, as if it were operating in an extreme energy... -
Hello everyone,
Thanks in advance to anyone who takes the time to help me. Sorry for the quality of my English, I had to use a translator at times...
I bought a functional Clevo D901C (Sager NP 92261) with its battery but without its power supply.
So, I invested in a new LiteOn charger, advertised by an online seller as the right charger for my machine... BUT, according to the pinout (4pin + shell) of the charger, 1 and 2 are 20V / and 3 and 4 are grounded. When I measure pin 4 with the ground of the PC, I have 300kOhms, which seems to be confirmed by the electrical...
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