minami mtv-21kum

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minami mtv-21kum

Post by baddypepito on Wed May 01, 2013 2:03 pm

hello at good day po sa lahat. hingi lang po sana ng dump ng tv na ito.

problem: volume 1 ay sobrang lakas. ang nagfunction po sa volume ay ang 0 at 1 lang. kapag naka0 ang vol ay walang sound at kapg naka1 na ay maximum level na ang kanyang sound.

major parts:
uoc: la76931k
vertical: la78040
regulator: strw6753
audio:cd7523cs

may pagkahawig po sa chinaboard, ang kaibahan nla ay ang power supply at ang audio section.

pashare po sana. tia

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Re: minami mtv-21kum

Post by ultrasonic™ on Thu May 02, 2013 12:37 pm

pwde ata ang mga Memo ng ibang china board nito.. gamayin mo nlng sa Svc. mode..

pr try mo pm ang mga kaelab member natin lalot sina sis pete, sis pedot at sis tukayo lhan.. lagi humahawak ung ng mga china board

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Re: minami mtv-21kum

Post by baddypepito on Sat May 04, 2013 10:24 pm

ako najud ni naukay og maau ang service mode ani sis. maraming beses na akong nakaencounter ng ganitong problema pro ito lang talaga ang hindi ko nakuha. mostly kc ay nasa service mode lang ang iniadjust ko. pro ito, kahit idirect ko pa sa input ng audio amp ay ganun pa din. sobrang lakas na ng vol 1.

plan ko sanang madrop nalang ng resistor galing sa audio output ng uoc ng sa ganun ay hindi magiging malakas ang kanyang sound. sayang naman kc sound problem nalang.

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Re: minami mtv-21kum

Post by ultrasonic™ on Mon May 06, 2013 1:23 pm

i will go pa rin ng S.mode yan sis.. kng na gamay mo na lhat ng parameter ng memo nya.. at no luck.. try mo ang ibang data (e2p) na china board din... baka sakaling umubra...

btw.. kng mag ko coupling or mgseseries ka ng high value series sa S-out ng ouc at S-in ng Sound ic ay hihina nga ang volume pero di mo pa rin makokontrol ang specific lakas nya..
its better pa na mag lagay ng potentio.. or try to make a digital potento..



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Re: minami mtv-21kum

Post by baddypepito on Mon May 06, 2013 7:57 pm

paano po ba sis ang digital potentio? parang interesado ako dito ah Smile

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Re: minami mtv-21kum

Post by ultrasonic™ on Tue May 07, 2013 3:48 pm

modification ang mngyayari sis...
gawa ka ng Digital Potentiometer gamit ang chip na available sa area mo.
like: DS1669, DS1869, AD5220, EVE-VCGJL016B (P12418-ND), MAX5160, CAT5128, MCP41010, MCP42010& etc.
search for datasheets nlng at sundan lng ang circuit application

example:
gaya nitong DS1669 na gamit ko noon
I
V



at DS1802

image courtesy from electronics-lab.com

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Re: minami mtv-21kum

Post by ultrasonic™ on Tue May 07, 2013 4:24 pm

pgnapagana mo na ng matino ang digipot sa itaas sis
e intergrate mo na sa board ng tv...

try mong evisualize eto:

ung dlawang switches.pushbutton sa diag direct mo na sa tact sw na nasa front panel ng tv with respect na kinondemn na ang orihinal na controls.

now para meron ka ding controls sa remocon.. iyong dlawang push button sa diag ay lagyan mo ng tag iisang optocoupler. bali e.g: naka parallel xa dapat sa photodiode/phototranny side which is pin3 & 4 ng pc817. ung pin2 daan muna sa resistor bago eground para di mapundi ang internal leds kng sakali man (^_^

ung pin1 nmn nya ay ikabit nyu sa pin ng uoc (sound section) na kng saan nagreresponse ito pagnipindot nyu ang vol+ at vol- ng remocon... mostly bumabato yan ng 1v-5v pgpiniress.. at 0v pg wala...

btw.. pg my tym ako edodrawing ko to (^_^


pahabol na rin ito for reference

For LS7083:
DS1802 (log)
AD5228 (single)
X9571 (single)

For LS7084:
X9C303 (log)(single)

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Re: minami mtv-21kum

Post by baddypepito on Wed May 08, 2013 8:46 am

maraming salamat dito sis... mga pila kaha ang budget ani sis?

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Re: minami mtv-21kum

Post by baddypepito on Wed May 08, 2013 1:48 pm

update: hay salamat naman at natapos na ito. programing lang namn talaga!

take note: after changing the programs, kailangan muna pala na iturn off ang tv b4 the changed programs will take effect. kaya pala walang pagbabago sa unang ginawa ko kc after changing the programs ay hindi ko naturn off ang tv. kaya ang data na kanyang nsave ay ganun pa rin.

but this is only in my own experience with this unit. but i was very glad to finish this unit.

salamat po sa lahat na nagshare ng kanilang mga brilliant ideas.

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Re: minami mtv-21kum

Post by MCU on Wed May 08, 2013 1:57 pm

saan ba mas makakamura?


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Re: minami mtv-21kum

Post by ultrasonic™ on Thu May 09, 2013 1:52 pm

^ cempre sir jan sa analog.. refer ko lng nmn yang digi pg ayaw ni tumer na mgkaroon ng tenga ang tv nya lol!

btw @sis baddy ngeee dpat SOP yan.. most of all models ay dpat tlgang e off... +1 sa inyo.. for updating the thread & congratz

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Re: minami mtv-21kum

Post by baddypepito on Fri May 10, 2013 1:16 pm

oi! salamat po sir ultra!

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Re: minami mtv-21kum

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