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Author Topic: TCL 2175 - Standby only  (Read 2036 times)

Offline malamig

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TCL 2175 - Standby only
« on: September 25, 2010, 09:43:15 PM »
Mga master pa help naman.
History:
Minsan horizontal line (white line only), minsan half the size ang screen.
Bago natuluyan, walang response ang REMOTE control (power, volume, channel)
so disconnect na lang sa line.
Now, ayaw na mag ON, standby LED lang.
May presence ng B+ 112V, +8V, +18V
Ok din ang +5V sa memory pin5 & 6.

H.Vcc - absent wala akong masukat.

So far napalitan pa lang yung ilang ecaps sa horizontal section.
Check ko ang FB sa ring tester bale shorted between 10 & 8
ewan ko lang kung accurate ang ring tester na pang test sa FB.

Ok naman ang mga TACT switch (madalas kasi nababasa ko isa ito sa mga causes)

Question;
Yung B+ 112V papuntang FB then resistor na 10K para sa output na 33V
eh 68V ang nababasa ko. Ok nman ang value ng 10K ang sukat ko.
Check ko ang HOT ok naman at yung ilang ecaps lang ang leaky.
FB na kaya ang sira nito?

salamat mga master.

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TCL 2175 - Standby only
« on: September 25, 2010, 09:43:15 PM »

Offline Roland

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Re: TCL 2175 - Standby only
« Reply #1 on: September 25, 2010, 11:04:08 PM »
hang mo po B+ sir tapos on mo unit kung magkaroon ng hvcc kahit saglit lang. Doon sa 33 volts(tuner supply)  na sinabi mo check mo sir baka open yong zener.

Check vertical circuit(according sa history).

Sana makatulong.
In every action there's always an opposite and equal reaction.

Philippine Electronics Forum

Re: TCL 2175 - Standby only
« Reply #1 on: September 25, 2010, 11:04:08 PM »

Offline malamig

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Re: TCL 2175 - Standby only
« Reply #2 on: September 26, 2010, 03:30:48 PM »
Sir Roland TY sa reply.
Medyo iba pla itong schematic sa board ko para dun sa 33V sa tuner may 1 resistor pa pla na dinaanan para maging 33V ok nman. OK din yung uPC574 na parang zener mukhang transistor kasi.
Hang ko ang B+ at nagkaroon ng reading sa H.Vcc pero maliit lang fluctuating from 1~2 volts then nag flicker ang standby LED.
(Note: wala po yung FB sa ckt nung ginawa ko itong test/reading)
Pasensya na at di po ako technician. hobby lang po mag troubleshoot sa electronics.

Philippine Electronics Forum

Re: TCL 2175 - Standby only
« Reply #2 on: September 26, 2010, 03:30:48 PM »

Offline m@r

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Re: TCL 2175 - Standby only
« Reply #3 on: September 26, 2010, 03:56:49 PM »
@TS sir try mo check yong vertical section specifically vertical IC and ecaps...
it's not how much what we have but it's how we used what we have...

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Re: TCL 2175 - Standby only
« Reply #3 on: September 26, 2010, 03:56:49 PM »

Offline pete

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Re: TCL 2175 - Standby only
« Reply #4 on: September 26, 2010, 09:48:59 PM »
try mo tanggalin ang memory then power mo sya para lang malaman natin kong may problema ang memory.


kadalasan pag standby lang ang TCL memory ang salarin palitan mo narin ang mga tact switch

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Re: TCL 2175 - Standby only
« Reply #4 on: September 26, 2010, 09:48:59 PM »

Offline Pangasinan boy

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Re: TCL 2175 - Standby only
« Reply #5 on: September 26, 2010, 11:31:47 PM »
parang loskon sa vert section ah
resolder muna sis
KUNG MAY PROBLEMA KA SA AKIN WAG MO IDAAN SA SALITA LANG. SET KA NG ARAW AT KITA TAYO

Offline Triple_D

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Re: TCL 2175 - Standby only
« Reply #6 on: September 27, 2010, 07:36:47 AM »
palit ka muna tact switch/pag ganun pa rin palit ka eeprom.
"Aanhin pa ang damo kung patay na ang kabayo"

Offline malamig

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Re: TCL 2175 - Standby only
« Reply #7 on: September 27, 2010, 08:29:05 AM »
Try ko po mga master yung suggestions nyo, update ko na lang ulit.

Maraming salamat ulit.

Offline bobbie

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Re: TCL 2175 - Standby only
« Reply #8 on: September 27, 2010, 05:12:50 PM »
@ TS..ano exact model nito? TCL-2175 o TCL-2175U?

Offline malamig

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Re: TCL 2175 - Standby only
« Reply #9 on: September 27, 2010, 08:41:08 PM »
Sir bobbie TCL-2175 nakalagay sa likod, pero sa board ang exact nya ay 40-2175SX-MA
bale 3 diagram na itong na download ko kasi wala akong makuha na exact na schematic hehe.



@ TS..ano exact model nito? TCL-2175 o TCL-2175U?

Offline bobbie

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Re: TCL 2175 - Standby only
« Reply #10 on: September 28, 2010, 09:48:53 AM »
magkahiwalay pa ba ang syscon at jungle niya o magkasama na??? kung magkahiwalay pa, try mo muna i actual yung XTAL ng syscon niya, same value ha

Offline malamig

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Re: TCL 2175 - Standby only
« Reply #11 on: September 28, 2010, 02:07:30 PM »
Magkahiwalay pa yung 2 Sir bobbie, cge try ko tanggalin yung xtal mmya pag uwi ko sa bhay.
Sir para saan ba yung supply ng H.Vcc? normal ba na wala akong masukat doon? pero pag naka hang ang B+112V
ay nagkakareading ng hanggang 2 volts lang. check ko yung mga katabi nya na components eh ok naman.
Pati yung digital transistor kala ko open ang reading pero good pa pala.
Sinubukan ko rin tanggalin yun memory at connection para sa TACT switch, pero pag press ko ng ON
ayaw pa rin mawala yung ilaw ng LED(standby).
Pero pag naka hang ang B+112 nag flicker naman yung standby LED.
Di ko pa rin ibinabalik yung FB, balak ko ipa-check sa RAON pag may time.

Offline bobbie

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Re: TCL 2175 - Standby only
« Reply #12 on: September 28, 2010, 02:54:30 PM »
lumang modelo pala yan sis.. ano e mail add mo para sa diagram... palitan mo na din muna yung ma capacitor sa secondary ng power supply, sakit niya yan pag medyo matagal na
yung H-Vcc e supply yan horiz section ng jungle IC para magkaroon ka ng "h-out signal" papuntang horizontal drive ckt mo, kailangan to para mag oscillate ang horiz section mo. ang H-VCC e galing sa power supply section Q805, switched voltage ito meaning lalabas lang ang H-Vcc mo pag nag ON ang syscon mo

Offline malamig

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Re: TCL 2175 - Standby only
« Reply #13 on: September 28, 2010, 05:58:47 PM »
sir bobby eto email ko malamigsajapan@yahoo.com maraming salamat sa pag ttyaga mo hehe.. hayaan m ggwin ko mga advise m. ty

Offline Roland

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Re: TCL 2175 - Standby only
« Reply #14 on: September 28, 2010, 10:03:15 PM »
pagnakahang b
Magkahiwalay pa yung 2 Sir bobbie, cge try ko tanggalin yung xtal mmya pag uwi ko sa bhay.
Sir para saan ba yung supply ng H.Vcc? normal ba na wala akong masukat doon? pero pag naka hang ang B+112V
ay nagkakareading ng hanggang 2 volts lang. check ko yung mga katabi nya na components eh ok naman.
Pati yung digital transistor kala ko open ang reading pero good pa pala.
Sinubukan ko rin tanggalin yun memory at connection para sa TACT switch, pero pag press ko ng ON
ayaw pa rin mawala yung ilaw ng LED(standby).
Pero pag naka hang ang B+112 nag flicker naman yung standby LED.
Di ko pa rin ibinabalik yung FB, balak ko ipa-check sa RAON pag may time.
pagnakahang b+ meron ka nasukat na 2 volts sa hvcc?  dapat 9 volts pagnaka-off ang system at 8 to 9 volts kapag nakaon ang system.
mmmmm amoy pretong isda.
nakakagutom
In every action there's always an opposite and equal reaction.

Offline malamig

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Re: TCL 2175 - Standby only
« Reply #15 on: September 29, 2010, 08:00:08 AM »
Yun lang ang nasukat ko Sir Roland. up to 2 volts lang at hindi steady.
Sinubukan ko rin habang naka hang ang B+112 any naka hang din ang H.Vcc papunta sa IC201
pero hindi nagbago ang reading sa emitter ng Q805. kapag nakakabit ang B+112V ay bumabagsak
ang reading ko sa H.Vcc mV na lang. Yung B+18V ok naman at dun sya kukuha para sa H.Vcc diba?
thru R825 10ohm. Ok naman yung mga components para sa H.Vcc except dun sa R826A sa diagram 470 dapat
pero 47 lang nakalagay sa board. Ako lang nman una nagbukas nito kaya hindi ito napalitan ng iba.
Direct replacement na lang kaya itong Q805 at Q806 kahit good pa ang reading?
Hindi ko kasi ma analyze yung ckt kung kailangan may OSC muna sa FB para magka 9V supply sa Q304?
di ko pa rin kasi ibinabalik yung FB sa board.
Susubukan ko rin ng e-cap planting, wala pa kasing time bumili ng mga parts hehehe...
Salamat ulit sa mga tulong nyo.....

Offline Roland

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Re: TCL 2175 - Standby only
« Reply #16 on: September 29, 2010, 08:44:21 AM »
wala pa akong nakitang hvcc na galing flyback sir, laging galing yan sa sec ng chopper.

Kapag pinindot mo ang power button ng unit dapat magkaroon ng 9 volts sa hvcc para magoscillate ang horizontal. No hvcc =no osc.
Mostly ang hvcc ang pinapatay ng syscon.

cguradohin mo muna kung nagpapapower-on and off ang syscon mo , kung ok sya dapat may hvcc ka na.
In every action there's always an opposite and equal reaction.

Offline bobbie

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Re: TCL 2175 - Standby only
« Reply #17 on: September 29, 2010, 09:50:38 AM »
para macheck mo kung gumagana yung switching ng Q805 at Q806, meron test point yan P001, i short mo lang dapat lumabas na HVcc niyan

Offline Roland

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Re: TCL 2175 - Standby only
« Reply #18 on: September 29, 2010, 10:34:27 AM »
para macheck mo kung gumagana yung switching ng Q805 at Q806, meron test point yan P001, i short mo lang dapat lumabas na HVcc niyan

ayan nmn pala, sir bobbie pinatagal pa eh.
In every action there's always an opposite and equal reaction.

Offline malamig

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Re: TCL 2175 - Standby only
« Reply #19 on: September 29, 2010, 10:49:34 AM »
Ok mga master check ko mmya pag uwi ko to.
Maraming salamat sir bobbie sa schematic. nakita ko na itong diagram na to pero di ko pinansin kasi walang 2175 hehehehe....

Philippine Electronics Forum

Re: TCL 2175 - Standby only
« Reply #19 on: September 29, 2010, 10:49:34 AM »

 

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