Question about Toshiba MW20FM1 20 in. Combo

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Toshiba md 20f51 07/2005

Yes i have a problem with my tv it will not power up how do i check it if itis the power supply or diodes i checked the fuse andit is good i get 68 volts acrossed it is that normal? and can i get a schematic sincerely please help Patrick

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Check out Toshiba Customer Support. They e-mailed me the instructions to reset the V-Chip.

customer_support@tacp.com


Posted on Sep 14, 2008

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Have you checked whether mains power reaches the power board? Check it first. If yes, the power board you purchased newly should be checked.

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If fuse blows off, the power supply regulator section circuit to your TV should be checked in detail. Check all the rectifier diodes first. Then check the main switching transistor for short. The work is a semi skilled one. For more information, check the link http://electronicshelponline.blogspot.com/

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Hello talwar,
Hi, the easy level would be to check for the following parts 1. fuse, if open, replace 2. faulty switch, check for continuity using a multi-tester device. 3. check open wire/power cable
if this cannot solve the problem.
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My 32HL57 model tv has sound but no picture?


en francais

le modul est fixé sur l'ecran
sur ce modul verifier si vous avez 3.3 volt (trois regulatuer avec un test point) si vous n'avez pas 3.3 verifier les deux fusibles F1 et F2
F1 devrais etre ouvert ....
bonne tv ;)

module is fixed on the screen

this modul check if you have 3.3 volts (three regulatuer with a test point) if you do not have 3.3 Check both fuses F1 and F2

F1 should be open ....

good tv;)

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1 Answer

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firstly check your sleeping timer set ups. if that is okey, then check the following
the power supply components eg
power transistor on the power supply lekage
zener diodes, power diodes of the bridge rectifier.
in short the supply is drowing to much current, hence semiconductors are heating up and reach a cutoff point, and saturates

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1 Answer

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the tv is fault, there is a lekage to ground, cause 5 amps is avery high current. plse take your tv to a w/shop and have the following checked
i rectifier diodes
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iii fusable resistors near the power transistor
iv making sure that a 90-110volts is getting out of the power supply to a line transistor, near the line trasformer.
the problem will be over

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1 Answer

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first remove all the dust from smps then check power cord output by multimeter whether right or not ok then open and you will find one fuse there check it without supply if open then replace it if not then check whether a.c. supply reaches or not if present then check the thermister resistance it should be low also check the dry solder if present then remove it please check dc supply at primary filter (big cylendrical capacitor) if not present then 4 bridge rectifier diodes may faulty replace it

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1 Answer

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firstly you need to repair a supply, check the following.
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1 Answer

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you have to check the power supply, take your tv to w/shop
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