• Tv Scott tvx 150 biały ekran

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 [SOLVED] Tv Scott tvx 150 biały ekran

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#1 Tv Scott tvx 150 biały ekran

by Tomasz1979 • 5 June 2018, 14:06
Witam serdecznie elektromaniakow trafił do mnie ów tv, włącza się normalnie dioda z czerwonej na zieloną po czym biały kolor LCD,po ok. 5min wyłącza się.
Sprawdziłem bezpiecznik na logice matrycy - sprawny, ma przejście napięcie na nim 0,47V. Na inwerterze napięcia vcc 11,98V, ON 2,55V, VB 0,44V inwerter pracuje na scalaku TL494C
Gdzie muszę jeszcze pomierzyć? Dodaję fotki
Załączniki:
Image

podaję nazwę Main THTFTV1595 V1. 0
Zasilacz zintegrowany z płytą główną napięcie dedykowane 12V

Re: Tv Scott tvx 150 biały ekran

by Google Adsense [BOT] • 5 June 2018, 14:06

#2 Re: Tv Scott tvx 150 biały ekran

by matic • 5 June 2018, 19:25
Tomasz1979 wrote:Sprawdziłem bezpiecznik na logice matrycy - sprawny, ma przejście napięcie na nim 0,47V.
Hello!
It is missing LCD matrix power supply voltage.

Please post a clear photos of both sides of the main board in the matrix connector area.

#3 Re: Tv Scott tvx 150 biały ekran

by Tomasz1979 • 5 June 2018, 20:36
Image
Image

#4 Re: Tv Scott tvx 150 biały ekran

by matic • 6 June 2018, 07:53
Please, post better pictures with visible marking on both chips in SO-8 package near the matrix connector.

#5 Re: Tv Scott tvx 150 biały ekran

by Tomasz1979 • 6 June 2018, 15:39
N28 and N11 in the board P-channel Mosfet APM9435.
N12 PWM Control AP1534
Image

#6 Re: Tv Scott tvx 150 biały ekran

by Tomasz1979 • 9 June 2018, 10:39
Hi, if you are more or less able to guide me, what should I measure? I noticed that the 15 ohm resistor R385 gets very hot, then the tv switches off. I will take a picture of this element and with it neighboring
Image

#7 Re: Tv Scott tvx 150 biały ekran

by Tomasz1979 • 11 June 2018, 08:25
Witam,co mam pomierzyć,czy ktoś spotkał się już z takim przypadkiem?

#8 Re: Tv Scott tvx 150 biały ekran

by matic • 11 June 2018, 12:55
Check on which component the highlighted pins are connected.
It is probably connected to the transistor Q39 or N28.

Image

#9 Re: Tv Scott tvx 150 biały ekran

by Tomasz1979 • 11 June 2018, 19:17
Napięcia zmierzone na N28 i Q39
Image
Image

#10 Re: Tv Scott tvx 150 biały ekran

by matic • 11 June 2018, 19:24
Actually, you didn't answer to my question.
matic wrote:Check on which component the highlighted pins are connected.

First use the continuity tester and check to which component the highlighted pins are connected.

#11 Re: Tv Scott tvx 150 biały ekran

by Tomasz1979 • 11 June 2018, 19:41
matic wrote:Actually, you didn't answer to my question.
matic wrote:Check on which component the highlighted pins are connected.

First use the continuity tester and check to which component the highlighted pins are connected.

I checked with the continuity tester, it only conducts N28. I marked it all in yellow
Image

#12 Re: Tv Scott tvx 150 biały ekran  [SOLVED] 

by matic • 11 June 2018, 20:13
If the voltages on the picture above were measured, when the TV was turned on, the "enable" signal on pin 4 of transistor N28 is missing.
This signal comes from the main micro controller chip, which is located under the metal shield.

The cause of the lack of this signal is probably corrupted firmware in FLASH chip (it is located under the metal shield as well) or bad main micro controller chip. I think it is more likely corrupted firmware.

The content of FLASH chip is probably unavailable, so I think the best solution is to replace the entire board with a new one.

#13 Re: Tv Scott tvx 150 biały ekran

by Tomasz1979 • 11 June 2018, 20:24
I've been looking for a new or used motherboard, but I can not find it anyway. I think so that the motherboard will be a part-donor. Wonderful for your interest in helping

Re: Tv Scott tvx 150 biały ekran

by Google Adsense [BOT] • 11 June 2018, 20:24
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