panasonic 21'' repair

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panasonic 21'' repair

Post by baddypepito on Wed Aug 08, 2012 8:30 am

good day po sa lahat... tanong q lang po,, my panasonic kc akong nrepair... regulator nya ay strw6754..ang problem nya po ay ng buksan ko ung tv ay nkagreen yung light indicator nya... tapos after mga 5minutes ay mgstandby sya... tapos main capacitor filter ay naiipon yong voltage.. nong una akala ko sira na yong regulator pro pagpalit ko po ng bago ay same problem... during nakagreen yong light indicator nya ay wala ring makkita na character sa screen.. tapos yong b+ voltage nya po ay hindi stable.. parang my tic tac sound sya sbay ang pagdrop ng voltage.pero ok naman yong horizontal output nya. kapag i hang up q yong b+input ng plybak ay hindi naman mgdrop yong b+ line nya... ang pinagtataka ko lang po ay open kasi ang resistance ng yoke sa horizontal at vertical nya.. it seldom happen kc..

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Re: panasonic 21'' repair

Post by triac on Wed Aug 08, 2012 9:36 am

sir baddypepito kung walang resistance yung yoke coil mo sira na yan,i wonder bat kya d nasira yung horizontal output..at saka sir yung b+ ng flyback doon mo e hang sa horizontal output collector.tungkol naman sa yoke coke coil may resistance talaga yan.

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Re: panasonic 21'' repair

Post by baddypepito on Wed Aug 08, 2012 9:56 am

@triac: oo nga po sir... balikan q yong unit mamaya.. dala ako ng ibang yoke... for the confirmation of the problem... ang history kc nyan ay mag.oneline horizontal dw nuon... hanggang sa hnayaan lang nla.. tpos ngayon,,wla n ksing mkkita sa screen... tiningnan ko na yong yoke coil nya,wla namang sunog sa labas,o bka naman nasa ilalim lng ang sunog... update ko lang kn ano ang mging resulta mmaya.. if its really the yoke that causes the problem. tnx po sa reply sir...

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Re: panasonic 21'' repair

Post by triac on Wed Aug 08, 2012 10:06 am

welcome po sir buddypepito,paki check mo na rin for possible open resistor...sira na talaga yan ang ko kc may 12 ohms at 4 ohms dyan na resistance..

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Re: panasonic 21'' repair

Post by ultrasonic™ on Wed Aug 08, 2012 12:47 pm

welcome dito sis

ano exact model nito sis? o chassis # nlng?
major parts?

kng my history xa na nag hohorizontal line..
bka may maluwag lng sa vertical section o nglulukong ecaps



subukan mu nlng munang magprilimenary check jan...


pero kng vertical line naman..




tumuon ka sa horizontal area lalo na sa fbt, pincushion at yoke (silipin ang kaloob luban.. baka my burnt spark (^_^

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Re: panasonic 21'' repair

Post by baddypepito on Wed Aug 08, 2012 7:37 pm

mga sir... my mali po ako... during checking of yoke,, hindi pala magkatabi yung kanyang horizontal coil sa yoke,,, yong isang terminal ng yoke ay nasa pinakaitaas at ang yong isa ay nasa pinakababa... ok lng ang yoke.. but nagoscillate na po siya... i guess sa plyback ang problem,,, my internal arching kc first time ay ok ang kanyang screen and after mga 5 minutes ay lalabas yong horizontal line sa gitna but still theres picture.. anf after few minutes shut down..

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Re: panasonic 21'' repair

Post by baddypepito on Wed Aug 08, 2012 7:39 pm

my video po ako ng actual repair q kanina but i dont know how to post it here mga sir... bagohan pa lang kc ako..

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Re: panasonic 21'' repair

Post by ultrasonic™ on Wed Aug 08, 2012 7:47 pm

try mung e-upload sa photobucket sis..
free registration nmn jan...

pwde ngang fbt yan.. or ngpoprotect lng tlga ang vert..
diagnose mu pang maiigi sis.. makukuha mu din yan..
voltage check ka lng lagi para mamonitor mu ang behavior ng mga supply

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Re: panasonic 21'' repair

Post by baddypepito on Wed Aug 08, 2012 8:02 pm

naupload ko na po yong video,,, kso lang di pa daw pwede mglink ang mga new member... after 7 days pa daw... pwede bang ipermit yong video mga sir...

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Re: panasonic 21'' repair

Post by ultrasonic™ on Wed Aug 08, 2012 8:04 pm

PM mu sa akin ang link at ako ang mgpopost para sau
if ayaw pa rin.. ibahin mu ang letra like: http = hxxp

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Re: panasonic 21'' repair

Post by ultrasonic™ on Thu Aug 09, 2012 11:14 am

hay sa wakas napost ko din...
ang hirap sa photobucket kya nilipat ko nlng baddy sa utube



pasok pa rin sa primary suspect ang yoke jan sis.. mas mainam palitan mu ng ibang yoke. pang test lng.. tama ka na pwde nga yang flybak ang salarin. kng my flybak tester ka lng sana o pang sub na ibang FBT.. mapoprove mu agad yan..
check mu din ang mga HV caps na nkahilira sa FBT side (polyesterine type) at tiyak pwde ka ng magkape...

pa OT:
tnx nga pla ky princess for guiding & helping me
na maipost ang video

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Re: panasonic 21'' repair

Post by baddypepito on Thu Aug 09, 2012 11:38 am

@ultrasonic..... maraming salamat po sis sa palipat... natry ko na pong mgtest ng ibang yoke... kaso nga lang, ganun pa rin yong problema..

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Re: panasonic 21'' repair

Post by ultrasonic™ on Thu Aug 09, 2012 1:11 pm


mukhang FBT na nga yan. lalot kng nacheck nyu na lahat ang mga HV caps..

try mu na ding tanggalin ang FBT at linising mabuti ang board (lacquer thinner)

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Re: panasonic 21'' repair

Post by arkin on Thu Aug 09, 2012 2:54 pm

chek resistors sa pligid ng fbt,lalo na sa ABL..na incouter kno yan,pro sa sharp at switch[prang china to]..

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Re: panasonic 21'' repair

Post by baddypepito on Thu Aug 09, 2012 7:13 pm

kaso nga lang,, wala kc akong same plybak n mgamit for testing eh... sana ay mconform na ang problem na ito ng sa gayon ay mashare din sa lahat....plybak # nga pala ay 2tfn82001a 4010 tfm107-15 4x02 23 @ultrasonic at arken,,, salamat po sa mga post nyo...

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Re: panasonic 21'' repair

Post by ultrasonic™ on Sat Aug 11, 2012 1:05 pm


di yata iyan 2tfn82001a
mukhang ZTFN82001A yan sis.
mga fbt na gamit ng pana TC20A04 at TC-21FJ30L (GP3)

pwde mung pang replace jan ang ZTFN82007A o di kya ZTFP12501.. kng available sa area mu...


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Re: panasonic 21'' repair

Post by kaholito on Sat Aug 11, 2012 6:42 pm

parang capacitor ang salarin nyan o kaya bad solder o may kinalawang na paa ng components.

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Re: panasonic 21'' repair

Post by baddypepito on Sat Aug 11, 2012 7:45 pm

@ultra salamat po sa info sis.... @kaholito tapos ko na po naresolder lahat sir... il check for mga kalawang na paa nalang po Wink

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Re: panasonic 21'' repair

Post by triac on Mon Aug 13, 2012 1:00 pm

sis buddy ppepito kung di talaga sira ang flyback,baka nga capacitor talaga ang salarin,paki kung walang hair line crack.tanong ko lang ko lng po,d ba nagbabago ang secondary voltage ng fbt kung nagloloko na sya?kc sa video sa umpisa parang ok naman sya..

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Re: panasonic 21'' repair

Post by baddypepito on Mon Aug 13, 2012 1:40 pm

@TRIAC kapag lalabas na po yong horizonatal line nya... yon din ang time na hindi na ngging stable ang kanyang mga secondary voltages.. pero kapag hindi pa lalabas yong horizontal line.. ok lang mga voltages nya... waiting palang aq sis na makakita aq ng playbak para mtesting q at para rin maconfirm na ang problemang ito....

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Re: panasonic 21'' repair

Post by triac on Tue Aug 14, 2012 9:50 am

sis baddypepito suggestion ko lng po ito,try to replace yung mylar na capaitor yung mataas ang voltage 1kv ba yan?dalawa ba yan?subok lng po sis..

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Re: panasonic 21'' repair

Post by baddypepito on Tue Aug 14, 2012 2:02 pm

@triac; ok po sis.... tnx... update po ako kung ano resulta...

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Re: panasonic 21'' repair

Post by ultrasonic™ on Tue Aug 14, 2012 4:31 pm

baddypepito wrote:@TRIAC kapag lalabas na po yong horizonatal line nya... yon din ang time na hindi na ngging stable ang kanyang mga secondary voltages.. pero kapag hindi pa lalabas yong horizontal line.. ok lang mga voltages nya... waiting palang aq sis na makakita aq ng playbak para mtesting q at para rin maconfirm na ang problemang ito....

nasubukan mu na bang mgpalit ng mga filter ecaps?
main at ska secondary?

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Re: panasonic 21'' repair

Post by baddypepito on Tue Aug 14, 2012 5:24 pm

@ultra.... hindi po sis.... pro ok lang namn mga ecaps kc meron akong in circuit capacitor tester... ok lng nman...

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Re: panasonic 21'' repair

Post by ultrasonic™ on Tue Aug 14, 2012 5:31 pm


buti nmn kng ganun.. needed mu na nga yan palitan ng fbt..
para mabawasan na ang hinala (^_^

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Re: panasonic 21'' repair

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