Can you replace a 4-terminal current sense resistor by a 2-terminal current sense resistor without lose of functionality ?
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Re: 4-terminal current sense resistors
The circuit still function but where you attach the sensing wires to will affect the current readings.
https://cdn.badcaps-static.com/pdfs/...d353fc9c95.pdfNever 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
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Hi.
Quick question.
I have a laptop that is completely dead. I opened it up and it looks like the current sense resistor is blown. However, because it's blown, the value printed on the top has disintegrated and there is no schematic available for this particular laptop (Dynabook Portege) so I'm not sure what to replace it with. -
Hi friends
I have reverse engineered this tester, schematic is attached and is complete except for capacitor values. These testers annoyingly have no model number but they are the ones you find on the first page of just about any website if you type in "18650 4-channel tester". There is also a 2-channel variant and a newer 8-channel variant. They are very cheap (about £15) and can measure voltage, current, internal resistance and capacity. They have a multicolour display for all these statistics. They also have terminal blocks so that if you want to use a breakout board... -
The bq24745 bq24745RHDR bq24745RHDT is a high-efficiency, synchronous battery charger with an integrated input-current comparator, offering low component count for space-constrained, multi-chemistry battery-charging applications. The input-current, charge-current, and charge-voltage DACs allow very high regulation accuracies that can be easily programmed by the system power-management microcontroller using the SMBus interface. The bq24745 charges two, three, or four series Li+ cells, and is available in a 28-pin, 5-mm x 5 mm QFN package.
The bq24745 features dynamic power management...10-23-2024, 02:50 AM -
Hello, I have an Alienware m15 R5 Ryzen, P109f002, with motherboard GDL56 LA-K453P Rev:1.0, Ryzen 9 5900HX, RTX 3070. I got it due to it having liquid damage. I am quite new to chip-level repair, and this is my second post, so please be kind with my incompetence. The charging IC is an ISL95522ah in HPB mode as far as I'm aware. I've been using a schematic for a LA-K455PR10_0525A that is available in the forum, and it seems to match for the most part. If it's okay I can link the schematic, or insert the pertinent page into my post.
It had some crusty areas that I've cleaned up.... -
Elco (?) 50" Smart TV. Backlight ( BL) issue.
Single Board : TP.SK708D.PC821
I bought new BL set . - OK
Power up : Blip . Protection.
Led Tester shows current at 34.2 mA , Previously it was 42.1 mA
Solution : Change current output .
The BL IC is marked on the photo and datasheet is QOB33535 Datasheet(PDF) - Schneider Electric (alldatasheet.com)
Calculating according to the datasheet - see attached photo :
With ILed = 34.2mA , equation #1 is RFb = 400mV / 34.2 = 11.7 Ohm , and with 42.1 mA we get 9.50 Ohm . i.e I should look for 9.5 Ohm...06-09-2024, 12:25 PM
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