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Hello amin22, Uai, so you've got an LG M228WA monitor that's doing a little dance with its backlight, huh? Turns on, backlight comes on, then it turns off and on again, like it's trying to tell you something. And the LCD itself is fine when the backlight is off? That's a classic CCFL symptom, alright. You mentioned testing some capacitors and transformers, which is a good start, but it sounds like you're missing a key piece of the puzzle – the schematic! I understand you're having trouble downloading the service manual from the link you provided. Let me see what I can dig up for you. Based on your request and the attached image, I've found a few candidate files in our File Manager that seem to be exactly what you're looking for. These should help you diagnose that CCFL backlight issue. Here are some options: Esquema elétrico Lg M198wa Lg M228wa 6748 eletronicabr.com - This looks like a complete technical service manual for the LG Flatron M198WA and M228WA monitors, based on the LP69G chassis. It should contain the schematic you need.Monitor TV LG M228WA-BM - This is another service manual for the M228WA-BM, which also includes the schematic.Manual de Serviço - Monitores LG M1721A, M1921A, M198WA e M228WA (Chassis CL-81 / LP69G) - This manual covers a range of LG monitors, including your M228WA, and is based on the CL-81 / LP69G chassis. It's a very comprehensive option.Given your description of the backlight cycling on and off, and testing the LCD without the backlight, the problem is likely in the inverter circuit or the CCFL lamps themselves. The schematic will be invaluable for tracing voltages and checking the components in the backlight driver section. Since you mentioned you don't have download access, you might need some Créditos EBR or an active VIP subscription to download these files. You can learn more about how to get credits here: Sistema de Créditos do EletrônicaBR. Let me know if you manage to download and examine the schematic, and if you find anything specific that points to the issue! Good luck with the repair! Exceção: Apostilas, E-Books, Cursos, Dicas e Tutoriais de Eletrônica não exigem Créditos EBR nem VIP para download. Prefix adjusted: I set this topic prefix to esquema. The user is still responsible for choosing and keeping the correct prefix. See the guide: Prefixos - Saiba aqui como utilizar.

Hello Model LG M228WA The device turns on and when the backlight comes on, the device turns off and then turns on again and continues like this. I turned on the device without the backlight and the LCD turns on without any problems. What is the problem? It is a CCFL backlight model. I tested some capacitors and they had values of 10 picofarads and 2200 picofarads, meaning the correct output value of the two transformers was 1200 kiloohms. In answer to how many CCFLs, I would say two. If anyone has a schematic of this part of the circuit, I would be grateful. This is the link to the monitor circuit file. I don't have access to download it. If it's possible, could you download it and send me a picture of this part? I'd appreciate it. I need it. https://eletronicabr.com/files/file/22116-manual-de-servi%C3%A7o-monitores-lg-m1721a-m1921a-m198wa-e-m228wa-chassis-cl-81-lp69g/?do=download

@NerdFix This is the link to the monitor circuit file. I don't have access to download it. If it's possible, could you download it and send me a picture of this part? I'd appreciate it. I need it. https://eletronicabr.com/files/file/22116-manual-de-servi%C3%A7o-monitores-lg-m1721a-m1921a-m198wa-e-m228wa-chassis-cl-81-lp69g/?do=download

Hello amin22, Thanks for posting. That behavior, where the monitor powers on with the backlight and then immediately turns off and cycles like that, usually points to an issue with the backlight system itself or its power supply. Since you mentioned the LCD turns on fine without the backlight, that's a good clue that the main board and T-CON are likely okay. Let's dive into this CCFL backlight issue: The Symptom: The monitor powers on, backlight lights up briefly, then it shuts off and restarts this cycle. This is a classic sign that the backlight circuit is either not getting enough power, is shutting down due to a fault, or the inverter board is struggling to maintain the high voltage needed for the CCFL lamps.Your Tests: You've already done some good work by testing capacitors and checking the output of the transformers. Measuring resistances of 10pF and 2200pF capacitors and getting 1200 kOhms on the transformer output is a starting point, but it doesn't tell us everything about the inverter's performance under load.CCFL Backlight: These monitors use CCFL (Cold Cathode Fluorescent Lamp) backlights, which require a high-voltage inverter to operate. The inverter board is often a separate component or integrated into the power supply board. Since you mentioned two CCFLs, it's likely that the inverter is designed to power both.What to Check Next:Visual Inspection of CCFL Lamps: Carefully inspect the CCFL tubes themselves. Look for any signs of darkness at the ends, cracks, or any physical damage. Even a slight crack can cause issues.Inverter Board Components: This is where I'd focus next.CCFL Transformers: While you measured resistance, check for any signs of overheating on the transformers themselves.High-Voltage Capacitors: Besides the ones you checked, look for any other capacitors around the inverter circuit. Sometimes, smaller ceramic capacitors or even electrolytic capacitors on the inverter side can fail.Inverter Transistors/MOSFETs: These are crucial for driving the CCFLs. Check them for shorts or any visible damage. They often run hot, so look for discoloration on the board around them.Fuses/Resistors on the Inverter: Double-check any small fuses or resistors directly associated with the inverter circuit.Backlight Voltage Check (Carefully!): This is where it gets a bit risky due to high voltage. If you have a good multimeter capable of measuring high DC voltages and you're comfortable doing so, try to measure the voltage going to the inverter board from the main power supply board. Also, if possible and safe, try to measure the output voltage from the inverter to the CCFL lamps. WARNING: Working with high-voltage circuits like CCFL inverters can be dangerous and cause severe electric shock. Always discharge capacitors before touching components and ensure the unit is unplugged.CCFL Connector: Make sure the connector from the inverter board to the CCFL lamps is clean and making good contact. Sometimes, oxidation on these connectors can cause issues.Schematic Request:You asked for a schematic, which is a great idea for this kind of troubleshooting. Based on the image you provided, the board seems to be an LG Innotek board, likely part of the power supply/inverter section. The label shows "FL9825B318G0733(3.0)" and "2300KPG070A-F PLLM-M602C". Trying to find schematics for specific power supply boards can be tough, but searching for "LG PLLM-M602C schematic" or "LG 2300KPG070A-F service manual" might yield some results. Since you've got 8 posts and 0 credits, you might find it hard to access some files directly. If you find a promising schematic or file in the download section, and you're having trouble accessing it, consider participating more in the forums to earn credits. You can learn more about the credit system here: Sistema de Créditos do EletrônicaBR. Let me know what you find after checking those inverter components. Good luck, and be careful with that high voltage!

Hello Model LG M228WA The device turns on and when the backlight comes on, the device turns off and then turns on again and continues like this. I turned on the device without the backlight and the LCD turns on without any problems. What is the problem? It is a CCFL backlight model. I tested some capacitors and they had values of 10 picofarads and 2200 picofarads, meaning the correct output value of the two transformers was 1200 kiloohms. In answer to how many CCFLs, I would say two. If anyone has a schematic of this part of the circuit, I would be grateful.

Opa pode me enviar o link via drive ?

@pshowfps Olá! Notei que você respondeu a um tópico antigo. O post original é de outubro de 2025 e sua participação mais recente foi em julho de 2026, quando você fez perguntas sobre um arquivo BIOS. Para garantir que você receba a ajuda mais adequada para o seu caso específico, por favor, crie um novo tópico na área correta do fórum. Informe todos os detalhes sobre o seu equipamento, o defeito apresentado, os testes que já realizou e, se possível, adicione fotos nítidas da placa e das etiquetas. Você pode criar um novo tópico na área de Pedidos de Esquemas e BIOS (PCs e AIOs) através deste link: Criar novo tópico Se você for novo no fórum, recomendo que faça sua apresentação para desbloquear mais recursos e organizar sua participação: Fazer apresentação Se tiver dúvidas sobre o funcionamento do fórum, regras ou acesso a downloads, consulte a área de "Contato com a Moderação": Contato com a Moderação Lembre-se que para baixar arquivos técnicos como BIOS, esquemas e BoardViews, é necessário ter Créditos EBR ou uma assinatura VIP ativa. Como você não possui créditos no momento, recomendo que participe da comunidade para acumular créditos ou considere a assinatura "Download 1" (10 créditos por 1 semana, com 1 download diário) através deste link: Loja de Downloads. Espero que isso ajude a direcionar sua solicitação! Links úteis: Criar minha apresentação Criar novo tópico em Pedidos de Esquemas e BIOS (PCs e AIOs)

conseguiu resolver? funcionou?

Estou na mesma situação de alguns colegas porém não tenho foto da tela mas tenho as informações OS: MT83-V1.00.0036.03-8KS AP: M6.CAB16.8920GM.64.HRG/V5.7_SP8920GM_0815 MPEG: DVP:01160401 Servo: e2010017 MCU: GM-AND2-8920 V5.24 Efetuei a atualização pq na versão acima Radio e BT as vezes não funcionava após atualização Radio não funciona e devido horário não testei o BT Desde já agradeço a atenção e ajuda e peço perdão pelo incomodo Deus abençoe!

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