universal power supply ng tv for 25 inches.

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universal power supply ng tv for 25 inches.

Post by kaholito on Sun Jul 15, 2012 10:22 am

nag try po ako irepair ito ksi wlang nalabas na boltahe sa secondary.bumili ako ng bago tapos pinalitan ko isa isa pra malaman ko kung ano pyesa ang bumigay.to my surprise napalitan ko na halos lahat ayaw pa rin magkapower ang secondary nya?pati ung binili kong bago parehas na sila ng sira?may 280v nmang napsok dun sa primary papunta dun sa trans d1710 pero ung pangatlong pin wala volt.ok nmnan mga trans zener resistor sa tester.panu kaya nangyari un?o panu mag kakaroon ng boltahe ung secondary?pano ba ang theory of operation nito?help nmn po.

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Re: universal power supply ng tv for 25 inches.

Post by ultrasonic™ on Mon Jul 16, 2012 5:03 pm

di ko masxadong mkuha... scratch
dlawang external psu ba ang tinutukoy
mu nito sis ?

ung pin3 ? pin3 ba yan ng tranny d1710 ?
bka emitter pin ng tranny yan which is going to ground

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Re: universal power supply ng tv for 25 inches.

Post by kaholito on Mon Jul 16, 2012 9:39 pm

may ginawa po akong tv pensonic.ginamitan ng universal tv power supply nung unang gumawa.un pong d1710 wla po syang output may pumasok na 280v sa isang pin ung isa nka ground ung isa pang pin wlang bolt.na lumabas.ang resulta wala syang bolt sa secondary.meron po akong spare na psu katulad ng ginamit nya,kya i try to repair ung psu nya replacing the components one by one pra malaman ko kung anong pyesa ang bumigay.ang pinagtataka ko lng po halos napalitan ko na lahat ng pyesa as lahat talaga,ganun p rin ang ang prob.pati po ung psu ko hindi na rin gumana at nagkaparehas na sila ng sira.ano kaya po ang nangyari?
silent

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Re: universal power supply ng tv for 25 inches.

Post by ultrasonic™ on Wed Jul 18, 2012 12:55 pm

bka sa feedback ngkakaproblema. my nafloat kang di dapat kaya nasira ang biasing ckt. check mung maigi
my diagram ka ba nyan ? gawin mung reference mu yun..

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Re: universal power supply ng tv for 25 inches.

Post by kaholito on Wed Jul 18, 2012 3:55 pm

ala pong diagram itong psu.souder po ang brand nya.pki explain nman po ung feedback at biasing ckt na sinasabi nyo?ano po ung meaning pag sinabing na float?sensya na po natuto lng ksi ako sa aktwal.pag dko po alam testerin palitan ko ng bago.kaya nga nagttaka ako bkit hindi pa rin sya gumana halos lahat ng pyesa napalitan ko na.

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Re: universal power supply ng tv for 25 inches.

Post by ultrasonic™ on Thu Jul 19, 2012 12:32 pm

ganun ba.. sayang naman... anu ang exact model nyan ? bka my matisod tau.

regarding sa feedback.. mostly sa mga chopper transfo o SMPT
ay my seperated na coil pin sa HOT side/primary nya. yan yung ngsisilbing feedback supply

ung bias ckt. nmn ang ngsisilbing controller at senses kng oVP ba o OCP ang PSU mu.. in a form of optoisolator, error amp at trimmer

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Re: universal power supply ng tv for 25 inches.

Post by kaholito on Thu Jul 19, 2012 3:41 pm

[img][/img]

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Re: universal power supply ng tv for 25 inches.

Post by kaholito on Thu Jul 19, 2012 3:46 pm

pano po ba magpost ng pic d2

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Re: universal power supply ng tv for 25 inches.

Post by ultrasonic™ on Thu Jul 19, 2012 4:37 pm

upload mu sa photobucket. register muna kau free nmn yan...
tapoz kunin mu ang link at gawin ulit ung ginawa mu sa itaas (^_^

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Re: universal power supply ng tv for 25 inches.

Post by kaholito on Fri Jul 20, 2012 11:10 am


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Re: universal power supply ng tv for 25 inches.

Post by kaholito on Fri Jul 20, 2012 11:16 am

nakita ko po yan sa internet ganyan po ung psu na ginagawa ko.wla op syang optoscillatorwla rin po syang ksamang diagram.halos lahat po ng pyesa sa primary napalitan ko na.

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Re: universal power supply ng tv for 25 inches.

Post by arkin on Fri Jul 20, 2012 1:31 pm

cguro my short sa secondary circuit..H. out or serang fbt ang salarin..

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Re: universal power supply ng tv for 25 inches.

Post by kaholito on Fri Jul 20, 2012 1:45 pm

nandyan lng ang sira sa ckt n yan ksi nung pinalitan ko ng bagong ganyan gumana na ung tv.taka lng ako dun sa inalis kong ckt bkit hindi ko mkita ang sira kung tutuusin ang liit lng ng ckt n yan.

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Re: universal power supply ng tv for 25 inches.

Post by ultrasonic™ on Mon Jul 23, 2012 2:37 pm

duda tlga akng naifloat mu ang di dapat nai-float... kya nabulag ang ovp/ocp na ngdulot ng my bumigay na pyesa. double check mu ulit sis... from feedback coil ng chopper patungong biaser (trimmer) . kng my error amp yan na tl431 ay direct sub ka kaagad ng good one. yung trimmer din wag ismulin.. bka di mu yan naisali sa suspect. my naencounter din akng nyan noon. trimmer lng pla ang salarin. smps nga lng ng digital weight scale ung sa akin. good in resistance check but bad on actual (in circuit)

btw.. my smd parts ba sa ilalim ng copper clad ?
bka my pwm ic gnagamit yan ?

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Re: universal power supply ng tv for 25 inches.

Post by kaholito on Tue Jul 24, 2012 12:12 am

ala pong ic ito master. ala din pong tl 431.try ko po mag post uli ng pic next time pra mas mkita nyo ng maayos ang veiw.wla nmn po nkafloat na pyesa nung tinaggal ko sa ito sa tv.tanggal kabit lng po ginawa ko.pati trimmer.un po mga tranny dyan d400.c1815 ung isa po ata ay a1015.

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Re: universal power supply ng tv for 25 inches.

Post by Electro on Wed Jul 25, 2012 4:37 pm

iba na talaga ang china. meron na palang mga ganyan master? maraming output ba yan?

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Re: universal power supply ng tv for 25 inches.

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