Cara Service TV Polytron Minimax MX6203M Stanby Terus

Kali ini KliniKomputer akan mencoba sharing tentang cara memperbaiki TV Polytron Minimax MX6203M yang Stanby Terus, KliniKomputer sempet pusing dengan kasus Polytron ini. Ok lanjut .....

Cara Service TV Polytron Minimax MX6203M Stanby Terus :

Indikasi Awal :
Ketika TV Polytron MX6203M ini dihidupkan lewat tombol power, led menyala merah tandanya tv stanby. Kebetulan Remote Tv ini sudah rusak. Terus KliniKomputer tekan tombol program untuk menyalakan TV, Polytron MX6203M ini kelihatan mau nyala dengan led warna merah jadi mati. Tapi setelah ditunggu beberapa saat, led kembali jadi merah lagi atau stanby.

Penyebab :
IC Vertikal TDA8174 rusak / konslet, sehingga menyebabkan IC Chroma / program STV2286 menjadi protek.


Berikut cerita service yg telah KliniKomputer lakukan terhadap TV Polytron Minimax MX6203M Stanby Terus :

Awalnya KliniKomputer cek elco di jalur B+ yg tegangannya kalo nggak salah 50v, dan ternyata kondisi elco masih bagus. Elco coba sy ganti, tapi ternyata TV Polytron Minimax MX6203M ini tetep stanby. Kemudian KliniKomputer coba browsing dan berikut ini hasil browsing :

" Kasus tv ini biasanya sering disebabkan oleh Vcc 50v yang tidak beres hanya karena nilai elco filternya yang terlalu kecil yaitu 10uF 60v, karena Vcc 50v tersebut adalah suplay utama Tr Driver Hor. Kalau rekan2 mengalami coba elco tersebut diganti dulu, tetapi dengan nilai yang lebih tinggi, misal 22uF 100v.

Pada permasalahan kedua: kalau elco sudah diganti dan Vcc minimal sudah mencapai 45v, coba distart apakah rangkaian Hor bekerja atau tidak ? Kalau diam coba ukur pada titik Colector Tr Driver Hor, kalau tegangannya rendah dibawah 15v atau Nol Volt berarti Ocsilator Hor dari IC Chroma tidak keluar. Dan jangan dulu punya pikiran untuk mengganti IC-nya, karena kebanyakan tidak rusak !!! Inilah yang bisa disebut protect !

Lepas dulu D304 (4148) di pin 46 (BCL), jalur ini melewati sebuah R menuju titik ABL Flyback, lalu coba start kembali tv pasti bisa nyala dan Hor bekerja tetapi biasanya gelap, kemudian ukur titik ABL FBT tadi, kalau Nol Volt pasti R ABL putus, sehingga menyebabkan protect !!!

R ABL yang mengambil dari B+ 115v dan menyebabkan protect tadi...Nilainya 82k...."


Kemudian KliniKomputer mulai praktekkan:

 
1. Ukur semua tegangan dan semua mengalami penurunan yg 50v jadi 23v. hal ini wajar karena TV dalam kondisi stanby.
2. cek R ABL = hasil normal
3. ganti elco filter untuk vertikal biasanya 1uF/50v = hasil nihil
4. Sempet juga berfikir kalau flybacknya yg rusak, tapi ternyata tidak.
5. kemudian dioda di jalur pin 46 IC Chroma STV2286 KliniKomputer lepas, dan ternyata betul, Flyback bekerja dan TV Polytron Minimax MX6203M ini kelihatan nyala tapi gambar tidak tampil. Setelah KliniKomputer ulangi untuk menghidupkan TV ini lagi dan perhatikan gambar di layar, ternyata sekilas terlihat garis putih horisontal ditengah layar. Baru ketemu masalahnya ........! Ini menunjukkan kalau IC vertikal rusak.

Ternyata setelah KliniKomputer ganti IC vertikal TDA8174, TV Polytron Minimax MX6203M ini langsung nyala begitu dihidupkan.

Alhamdulillah ........

Pesen : Kalo service, urutkan dulu kerusakan termudah menurut perkiraan kita. Padahal yg rusak cuma IC vErtikal, tapi KliniKomputer sudah kebablasen ngecek yg lainnya yg lebih rumit....

Selamat MEncoba ....

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