Hello.
I have 29inch LG CRT TV,And Yesterday,Whenever I connect AC power cord to power outlet without switch on, I heard a sound like white noise, And When I switched on this CRT TV, It sometime displayed correctly But usually It won't last more than 20 minute and The screen begin to dark and It finally did not display at all for hours..
Today,I dismantled its plastic case and discharged the biggest capacitor(400wv 470uf) which still holds 250 voltage,and I finally detached PCB from cathode-ray tube.
I measured ESR value of most of caps in PCB with MESR-100 and I found that KME(25v 470uf) and SMS cap(100v 22uf) from Korea chemicon and RG cap(25v 220uf) from samhwa is not good which is very close to STR-S6707 switching generator.
Especially ESR value of RG cap is higher than 100 ohm.
Currently I have some of samxon GF caps,So I browse through KME and RG and GF datasheet which I attached and I found that Although, Maximum ripple current of GF cap(105 degree Celsius,100kHZ) is higher than that of KME and RG and SMS caps,But Maximum ripple current of KME and RG and SMS cap has different frequency rate(120Hz)
But Is it possible to replace KME or RG cap with samxon GF cap even if It has different frequency rate(100Khz) in Maximum ripple current specification and Lower impedence?
I have 29inch LG CRT TV,And Yesterday,Whenever I connect AC power cord to power outlet without switch on, I heard a sound like white noise, And When I switched on this CRT TV, It sometime displayed correctly But usually It won't last more than 20 minute and The screen begin to dark and It finally did not display at all for hours..
Today,I dismantled its plastic case and discharged the biggest capacitor(400wv 470uf) which still holds 250 voltage,and I finally detached PCB from cathode-ray tube.
I measured ESR value of most of caps in PCB with MESR-100 and I found that KME(25v 470uf) and SMS cap(100v 22uf) from Korea chemicon and RG cap(25v 220uf) from samhwa is not good which is very close to STR-S6707 switching generator.
Especially ESR value of RG cap is higher than 100 ohm.
Currently I have some of samxon GF caps,So I browse through KME and RG and GF datasheet which I attached and I found that Although, Maximum ripple current of GF cap(105 degree Celsius,100kHZ) is higher than that of KME and RG and SMS caps,But Maximum ripple current of KME and RG and SMS cap has different frequency rate(120Hz)
But Is it possible to replace KME or RG cap with samxon GF cap even if It has different frequency rate(100Khz) in Maximum ripple current specification and Lower impedence?
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