Can I replace ISL88738H WITH ISL88739?
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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 -
When I tried to repair LG 29 inch CRT TV, I found that the ESR value of samyoung SMS capacitor(160v 2.2uf), which is very close to D1879 transistor, is 6 ohm.
Judging from above ESR Meter Table,I think It is necessary to replace this sms capacitor.So I visited local electronics shop,and I purchased 160v 2.2uf rubycon YK capacitor.
But when I browse through rubycon YK datasheet,I found that there is no ripple current rating for 160v 2.2uf specification. But On the contrary, I found 39 mA ripple current rating for 160v 2.2uf SMS capacitor.
Rubycon YK DataSheet (b... -
I've just been repairing some (very) old speakers with a loud hum that occurred as soon as you powered them on regardless if any actual audio is played through them. I work in a School so it's 99% likey that the Teachers have hardly ever turned the power off on them for well over 10+ years.
As you can see the top large capacitor on the right has a bulge on the top so defincately needs replacing. As the one next to it is exactly the same capacity and voltage I planned to replace them both.
What is your advice/opinion on whether or not on old(er)... -
Good evening, colleagues.
Does anyone know an equivalent or a compatible replacement for the uP9002P IC (power controller)? Alternatively, does it come under any other marking or code on different boards?
Any insight or cross-reference would be greatly appreciated. Thank you in advance!09-01-2025, 08:43 PM -
Hi All,
I'm looking for a SMPS flyback transformer TAM TO-5622, or equivalent, or any information on it? Company is Tamura Corp (https://www.tamuracorp.com). It has Primary, Secondary, and Auxiliary windings. Have emailed the company, but no info back yet. It is out of a Makita DC24SC battery charger.. This transformer has a burnt out the primary (caused by a failed MOSFET). Secondary, gave me a reading of 0.49 Ohms, and Auxiliary a reading of 0.93 Ohms. I took it to bits, thinking I might try and re-wind it, but it was more complex than I realized, and had difficulty removing...08-28-2025, 02:03 PM
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