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Author Topic: TCL 21276P FLYBACK NO OSCILLATION  (Read 822 times)

Offline enriz622

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TCL 21276P FLYBACK NO OSCILLATION
« on: May 05, 2012, 09:50:22 PM »
Mga master paano ba maconfirm kung jungle nga talaga ang salarin.ok kasi ang b+110v,8v,5v may .3v sa base ng hot.Umiinit ang hot at sa tagal sobra ang init at masisira ito kung tatagal.Galing ito sa ibang tech. twice na nerepair pero ala pang isang oras pagkaalis ng technician sira na naman ang hot,yung last na pinalit nya under rated ang nilagay na hot akala ko yon lang ang trouble pero kahit napalitan na ng correct replacement ang wala na itong oscillation na nangyayari .Duda kasi ako sa jungle direct sub ko na fbt,snubber cap at isolate ko na din ang secondary ng fbt pero walang shorted.Pwede bang ordinary tester para malaman kung correct ang signal ng hout

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TCL 21276P FLYBACK NO OSCILLATION
« on: May 05, 2012, 09:50:22 PM »

Offline Min

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Re: TCL 21276P FLYBACK NO OSCILLATION
« Reply #1 on: May 05, 2012, 10:06:30 PM »
Hindi nman siguro sira jungle nyan. Sir enriz hindi kaya na open na ung resistor 1ohm sa B+ pin ng flyback kaya no oscillation na?

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Re: TCL 21276P FLYBACK NO OSCILLATION
« Reply #1 on: May 05, 2012, 10:06:30 PM »

Offline Tripler02

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Re: TCL 21276P FLYBACK NO OSCILLATION
« Reply #2 on: May 05, 2012, 10:43:47 PM »
pwede rin maging cause ng paginit ng hot mga part around hdtrafo..just like philips..
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Re: TCL 21276P FLYBACK NO OSCILLATION
« Reply #2 on: May 05, 2012, 10:43:47 PM »

Offline enriz622

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Re: TCL 21276P FLYBACK NO OSCILLATION
« Reply #3 on: May 06, 2012, 06:44:27 AM »
Napalitan na po ang resistor mga sis sabay ng hot at normal ang supply ng hdt.Bunot ko na lahat ng pwedeng dahilan ng hindi pag oscillate ng fbt,buo din ang hdt tranny ang di ko nalang sure ay kung correct ang on/off signal ng hot,ang alam ko tama dapat ang count galing h-out,kung hindi masisira ang hot,paki correct nalang mga master kung mali pagkaalam ko

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Re: TCL 21276P FLYBACK NO OSCILLATION
« Reply #3 on: May 06, 2012, 06:44:27 AM »

Offline pete

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Re: TCL 21276P FLYBACK NO OSCILLATION
« Reply #4 on: May 06, 2012, 07:05:50 AM »
Napalitan na po ang resistor mga sis sabay ng hot at normal ang supply ng hdt.Bunot ko na lahat ng pwedeng dahilan ng hindi pag oscillate ng fbt,buo din ang hdt tranny ang di ko nalang sure ay kung correct ang on/off signal ng hot,ang alam ko tama dapat ang count galing h-out,kung hindi masisira ang hot,paki correct nalang mga master kung mali pagkaalam ko
sukatan mo ng current ang B+ mo kong normal ex.  (B+) 115 /100w=1.15w /2=0.575 pag tumaas dyan masisira nga ang hot...

pwede mataas or mababa  ang hor. freq.

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Re: TCL 21276P FLYBACK NO OSCILLATION
« Reply #4 on: May 06, 2012, 07:05:50 AM »

Offline Min

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Re: TCL 21276P FLYBACK NO OSCILLATION
« Reply #5 on: May 06, 2012, 10:09:18 AM »
Pwede ata ma test freq. nyan using DMM ng may frequency meter dun pwede masukat oscillation frequency 15,734 hz
Mapapalad ang mga technicians na may oscilloscope pag ganyang mga trouble.  :)
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Offline enriz622

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Re: TCL 21276P FLYBACK NO OSCILLATION
« Reply #6 on: May 06, 2012, 10:38:08 AM »
Update lang po may kunting out po pala sa secondary ng fbt sa may supply ng vertical 1.3v at sa lahat ng mababa din mukhang kulang ang freq. galing hout. ang amperahe sa b+110v .09 amp. lang

Offline pete

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Re: TCL 21276P FLYBACK NO OSCILLATION
« Reply #7 on: May 06, 2012, 11:39:32 AM »
Pwede ata ma test freq. nyan using DMM ng may frequency meter dun pwede masukat oscillation frequency 15,734 hz

tama sanwa cd800a ang gamit kong tester dyan na may freq.


Mapapalad ang mga technicians na may oscilloscope pag ganyang mga trouble.  :)
sa una lang daw yun pag bago pa ang tech. pagmatanda na kagaya ni kagawad hindi na kailangan yun hehehehe

Offline enriz622

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Re: TCL 21276P FLYBACK NO OSCILLATION
« Reply #8 on: May 06, 2012, 12:29:04 PM »
Pundar muna ako kahit tester lang :) ok ba yong gamit mong tester master pete magkano ba kuha mo dyan

Offline enriz622

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Re: TCL 21276P FLYBACK NO OSCILLATION
« Reply #9 on: May 06, 2012, 12:29:14 PM »
Pundar muna ako kahit tester lang :) ok ba yong gamit mong tester master pete magkano ba kuha mo dyan

Offline mcleod

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Re: TCL 21276P FLYBACK NO OSCILLATION
« Reply #10 on: May 06, 2012, 01:37:16 PM »
baka may problem sa main regulator, pede ding caps sumisibak ng hot, pedeng resistor or leaky diode, yung primary caps 400v sumisibak  ng hot pag leaky, fbt problem nasibak ng hot, yoke mo naninibak ng hot at pati 3.5 MHz crystal naninibak din ng HOT.
abl line, good components?

ot: si sis raffftt binibenta dmm niya look mo sa for sale section.
What makes you think, we owe you an answer? Ask and you shall receive... but all in the proper time.

Offline pete

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Re: TCL 21276P FLYBACK NO OSCILLATION
« Reply #11 on: May 06, 2012, 02:27:28 PM »
Pundar muna ako kahit tester lang :) ok ba yong gamit mong tester master pete magkano ba kuha mo dyan
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Offline enriz622

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Re: TCL 21276P FLYBACK NO OSCILLATION
« Reply #12 on: May 06, 2012, 10:08:50 PM »
baka may problem sa main regulator, pede ding caps sumisibak ng hot, pedeng resistor or leaky diode, yung primary caps 400v sumisibak  ng hot pag leaky, fbt problem nasibak ng hot, yoke mo naninibak ng hot at pati 3.5 MHz crystal naninibak din ng HOT.
abl line, good components?

ot: si sis raffftt binibenta dmm niya look mo sa for sale section.

Offline enriz622

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Re: TCL 21276P FLYBACK NO OSCILLATION
« Reply #13 on: May 06, 2012, 10:29:35 PM »
baka may problem sa main regulator, pede ding caps sumisibak ng hot, pedeng resistor or leaky diode, yung primary caps 400v sumisibak  ng hot pag leaky, fbt problem nasibak ng hot, yoke mo naninibak ng hot at pati 3.5 MHz crystal naninibak din ng HOT.
abl line, good components?

ot: si sis raffftt binibenta dmm niya look mo sa for sale section.
lahat ng sinabi mo sis ok lahat pwera ang hdt tranny hindi sya saturated. ang boltahe sa h-out 5.5v may naka series na resistor 560 ohms after ng resistor na yan .25v nalang

Offline MX45

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Re: TCL 21276P FLYBACK NO OSCILLATION
« Reply #14 on: May 07, 2012, 01:05:33 PM »
lahat ng sinabi mo sis ok lahat pwera ang hdt tranny hindi sya saturated. ang boltahe sa h-out 5.5v may naka series na resistor 560 ohms after ng resistor na yan .25v nalang


sis .. may spacer na goma paba yan sa yoke to crt? try mo nga e measure sa analog 10K range sa vertical winding at doon sa goma na spacer kung may leakages.last week kasi ganyan ang scenario ng nakuha kung problema pero sa samsung brand.
Gawin mo ang nais mo, sundin mo ang gusto mo dahil ikaw o ang sarili mo ang hari ng yung kagustuhan...

Offline enriz622

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Re: TCL 21276P FLYBACK NO OSCILLATION
« Reply #15 on: May 07, 2012, 05:41:08 PM »
Malinis pa ang yoke sis at test narin ang same yoke pero same trouble ,yong hdt supply ang duda ako kasi dapat magdadrop ang supply ng hdt pero same lang kahit mainit na ang hot iwan ko lang kung ibang ito.Dalawa kasi ang supply ng hdt,isa galing chopper 12v at galing sa +14v supply ng vertical.kailangan mag on muna ng todo ang fbt bago magka supply ng 14v ang hdt

Offline mcleod

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Re: TCL 21276P FLYBACK NO OSCILLATION
« Reply #16 on: May 08, 2012, 09:40:41 AM »
Malinis pa ang yoke sis at test narin ang same yoke pero same trouble ,yong hdt supply ang duda ako kasi dapat magdadrop ang supply ng hdt pero same lang kahit mainit na ang hot iwan ko lang kung ibang ito.Dalawa kasi ang supply ng hdt,isa galing chopper 12v at galing sa +14v supply ng vertical.kailangan mag on muna ng todo ang fbt bago magka supply ng 14v ang hdt

na-check mo na fusible resistors near fbt and hot? yung yoke na-check mo na ba? ano chroma / deflection ic or other ic's ginamit? especially ano vertical ic ginamit?
What makes you think, we owe you an answer? Ask and you shall receive... but all in the proper time.

Offline DSM_elektronix_shop

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Re: TCL 21276P FLYBACK NO OSCILLATION
« Reply #17 on: May 08, 2012, 10:47:11 AM »
sa base ba ng hdt ilan ba nasusukat sis??wala pa kasi ako nabasa kung nagreresponse pa ang base bias ng hdt galing jungle
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Offline enriz622

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Re: TCL 21276P FLYBACK NO OSCILLATION
« Reply #18 on: May 10, 2012, 07:36:27 PM »
Sa h-out nga sis ng jungle nasa 5.5v at after ng 560 ohms resistor nasa .25v nalang 8873 po ang uoc

Offline BUMBLEBEE

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Re: TCL 21276P FLYBACK NO OSCILLATION
« Reply #19 on: May 10, 2012, 07:47:17 PM »
sis na try mo na ba hung lahat ng resistor lalo na connected sa hdt baka nag-change value na..
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Re: TCL 21276P FLYBACK NO OSCILLATION
« Reply #19 on: May 10, 2012, 07:47:17 PM »

 

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