JVC 21BA17B problem

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Re: JVC 21BA17B problem

Post by willyboy on Thu Jan 12, 2012 8:49 pm

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when i tried to check dc volt mga bossing eh
pin 1and 3: is 135vDC
and pin 2and 3 is 135vDC din??? dapat eh 9vdc lang dba?? bakit kaya??

is this sira na kaya IC951

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Re: JVC 21BA17B problem

Post by willyboy on Thu Jan 12, 2012 8:52 pm


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Re: JVC 21BA17B problem

Post by willyboy on Fri Jan 13, 2012 6:20 pm



ang nakuhako voltahe sa IC 050RDAsa pin 1and 3 ay 20VDC..dba dapat eh 8.4volt DClang??

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Re: JVC 21BA17B problem

Post by peter on Fri Jan 13, 2012 7:37 pm

pa subscribe nalang may diagram na pala


during standby yata yan check mo ang out ng ic na yan kong 5vdc ba sya

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Re: JVC 21BA17B problem

Post by willyboy on Sat Jan 14, 2012 5:51 pm

mga master..tamapo ba ang nakukuha ko sa HORIZONTAL TRANSISTOR ko.. yung c-b:139vdc at b-e:139V

at sa PIN1and 3 ng IC921(STR W6554A-F5) wala ako makuha na voltahe.. at bakit napansin ko paglagay ko 1probe ng tester( isa probe palang..nag buzz na tester ko.. nakalagay sya either dc or ac)


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Re: JVC 21BA17B problem

Post by peter on Sun Jan 15, 2012 11:18 am

sure po kayo na b-c 139 at b-e 139? parang mali yata dapat e-c lang sya

kong sa strw ka naman mag reading dapat dun ka sa mains capacitor mag lagay ng ground (HOT GROUND)

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Re: JVC 21BA17B problem

Post by ultrasonic™ on Mon Jan 16, 2012 11:30 am


my mali nga jan... E ng HOT ay going to ground
B nmn nya ay going to HDT
C nmn nya ay going to Coil pin ng FBT which is dinadaanan ng B+ line


paki check TS bka shorted na ang B-E mu sis

regarding nmn dun sa LV reg mu na 050RDA kng my masusukat kng supply sa pin1(Vin) dpat meron kng mkukuhang Vout(pin2) respect to ground. check mung maigi ang pin4(contrl)

kng maaari ay hinang mu ang load ng LV reg mu.. para mas maisolate mu ang problem

anu nga pala ang exact chassis ng modelong ito.. para masundan kita


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Re: JVC 21BA17B problem

Post by willyboy on Mon Jan 16, 2012 9:23 pm

may sticker ito brod nakalagay SCW-1956A

at yung nakap print mismo sa mainboard nya ay ito:
GGB10041-001DH
MAIN PB ASSY

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Re: JVC 21BA17B problem

Post by willyboy on Mon Jan 16, 2012 9:30 pm

nga pala boss.. nagpalit na rin ako panibago IC (regulator IC yataito)
STR W6554A-F5
pero ganun padin.. niresolder ko narin yung eeprom

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Re: JVC 21BA17B problem

Post by willyboy on Tue Jan 17, 2012 10:55 am

mga bossing..sensya may mali sa post ko..e2 pla reading ng Q522
c-e:143
c-b:143

at sa IC na 050RDA itopo reading ko:

pin 1 and 3:28vdc
PIN 2 and 3: 1.87vdc

masyado ba mataas yung PIN 1 and 3ko?
at masyado mababa PIN 2and3?


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Re: JVC 21BA17B problem

Post by ultrasonic™ on Tue Jan 17, 2012 7:13 pm

willyboy wrote:may sticker ito brod nakalagay SCW-1956A

at yung nakaprint mismo sa mainboard nya ay ito:
GGB10041-001DH
MAIN PB ASSY

parang hndi yan ang chassis. mostly nkaimprinta yan mlapit sa FBT..
ok regarding sa probz mu.. minsan normal na mataas ang standby supply
bababa lng pag-normally nag ooscillate ang buong unit.

DL muna aku mapa nito

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Re: JVC 21BA17B problem

Post by willyboy on Tue Jan 17, 2012 9:36 pm

GGB10041-001DH
MAIN PB ASSY

bossing possitive po ako na ito ang code na naka print sa board sir..
ito rin naka print sa likod ng board namay pcbsatabi ng FBT

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Re: JVC 21BA17B problem

Post by willyboy on Tue Jan 17, 2012 9:40 pm

http://www.4shared.com/rar/ovkuYNC1/jvc_chassis_cw3_av21mt16.html

Bossing yan ang almost katulad ng board ng JVC AV21ba17

sa page 80ang sinusundan ko kasil ahat ng pyesa nito katulad

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Re: JVC 21BA17B problem

Post by ultrasonic™ on Wed Jan 18, 2012 3:48 pm

nyaha chassis cw3 chassis pala ito (^_^

kya pla ang hirap hagilapin.. eto ang mga chassis ng interiair version na ang daming series board. tulad din ng mussee

@TS bigay mu nga sa amin ulit ang mga test point natu..



C956 = ___V ? iyan ang B+ mu

IC972 = PQ033RDA = LV reg ng 3.3V mu

pin1 = ?
pin2 = ?
pin4 = ?

IC973 = PQ120RDA = LV reg ng 12V

pin1 = ?
pin2 = ?
pin4 = ?

IC975 = PQ050RDA = LV ng 5V

pin1 = ?
pin2 = ?
pin4 = ?



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Re: JVC 21BA17B problem

Post by willyboy on Wed Jan 18, 2012 5:29 pm

bossing this is the reading:
IC 972 :
Pin 1: 8.8v
Pin 2; 3.2V
Pin 4 : 8.8

IC 973 :
PIN 1 : 28v
Pin2 : 0.8V
PIN4 : 0.8v

IC 975
PIN 1 : 19V
PIN2 :0.8V
PIN4 : 0.8

C956:142V

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Re: JVC 21BA17B problem

Post by ultrasonic™ on Thu Jan 19, 2012 4:15 pm

ok.. based sa mga partial test point
normal na ang ic972
normal din ang ic973 & 975 mu kasi nkastandby mode pa yan...
mgkakaroon ka na ng output na 12V at 5V pggumagana ng matino ang UOC mu... tumuon ka ngyon sa pin4 ng LV reg na mga yan. check mu din ang ic971 dahil iyan ang isa sa daanan ng prot. isunod mu nmn ang mga test point ng UOC... dahil jan nagmumula ang signal na mgtitrigger sa kanila

bago natin pakialaman ang mga protection ckt....


or kng gusto mu agad ng madalian... at para bawas oras at duda.. pwde ka munang mag bypass ng modi. float/hinang ang mga reg na yan.. palitan mu ng 7805 at 7812 (3pins). respect to reference voltage arangemnt/designation. hayaan munang nkfloat ang pin4.
then observe...

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Re: JVC 21BA17B problem

Post by willyboy on Thu Jan 19, 2012 5:22 pm

good pm Bossing..

sensya.. naligaw ako doon ah..ano po Yung 7805 at 7812..saan ko ito i hinang?


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Re: JVC 21BA17B problem

Post by willyboy on Fri Jan 20, 2012 3:21 am

IC pala ang mga ito sir. sge..try ko balik sa RAON Quiapo... look for this parts and update ako... Tnx bossing

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Re: JVC 21BA17B problem

Post by willyboy on Fri Jan 20, 2012 3:36 am

http://wiki.answers.com/Q/A_7812_transistor_is_pnp_type
---- 7812 is not a transistor???

http://winsunhk.en.alibaba.com/product/288410795-212088355/Transistor_7812.html

-----TRansistor nman d2???

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Re: JVC 21BA17B problem

Post by willyboy on Fri Jan 20, 2012 1:06 pm

mga bossing..sensya po.. diko po kabisado mga terminology ng TV section...

wat po yung UOC.. paki pic attach naman po..

ill try to buy transistor 7805 at 7812 to check your advice bossing and update you on this

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Re: JVC 21BA17B problem

Post by zandertech on Fri Jan 20, 2012 1:24 pm

Sir opinion lng,...may nagawa me na ganyan,FBT po ung sira,.try mu lng tanggalin ung fbt mu,..minsan kc may grounded sa rewind nia,..ewan q lng if same ung sira nyang sau,..then check mu ung B+ muh if n0rmal na,..may isa rin me nagawa ,.tcl naman ganyan din nag titick,... The pr0blem naman is may leak ung isang rectifier sa secondary circuit

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Re: JVC 21BA17B problem

Post by willyboy on Fri Jan 20, 2012 2:13 pm

Boss Zander... Pag FLYback..dba delikado magpalit... affraid first timer hhehehe..

regarding naman sa leaky rectifier diode.. ito ba yung pag checkmo.. ok sa tester..pero pag kinabit na ..ito palayung may problem..??

salamat brod..

patulong naman uli..ANU yunng UOC ng TV... sensya..di ko kasi linya TV...pero interesado ako matuto..

una ko pinag experementuhan yung TCL ko..ayun..buhay pa till now congratulation

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Re: JVC 21BA17B problem

Post by willyboy on Fri Jan 20, 2012 2:44 pm

boss zander,.. b+ ko is 142v.. ano ba dapat normal voltage ng B+?

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Re: JVC 21BA17B problem

Post by willyboy on Fri Jan 20, 2012 2:53 pm

Boss Ultra..wala po pla ito IC971,sa circuit...may X ito

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Re: JVC 21BA17B problem

Post by ultrasonic™ on Fri Jan 20, 2012 5:35 pm

willyboy wrote:mga bossing..sensya po.. diko po kabisado mga terminology ng TV section...

wat po yung UOC.. paki pic attach naman po..

ill try to buy transistor 7805 at 7812 to check your advice bossing and update you on this

Ultimate One Chip (UOC) ang tawag sa isang IC na pnagsamasama ang system control-video/Chroma/jungle-IF-RGB-SYNC & etc. in short halos pnagsama sama na sa iisang package

kng tama ang servce manual na hawak natin eto ang UOC mu (IC701)



rgarding nmn jan sa LM78XX ay LV voltage regulator ang mga yan..
kasali na yan sa IC's families.

takenote.. pnapagamit lng kita nyan for diagnose/testing purposes lng..
ng mas mpag-aral lng mu ang buong operation ng board mu

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Re: JVC 21BA17B problem

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