Removing IC Protection
Repair and diagnose in inverters and power supply units of the LCD panel. Sometimes meter readings are often wrong especially if over-consumption in some elements of the circuit and other PCBs. There is a possibility to turn off the protection of some integrated circuits in order to perform a more efficient measurement.
Such diagnosis requires high repair experience since all circuits can be damaged.
If you are unfamiliar with this type of procedures DO NOT PERFORM THIS TYPE OF DIAGNOSIS.
Some of the diagnoses were not personally tested, so, if some does not work, please let me know.
Para reparar e fazer o diagnóstico, muitas vezes é necessário verificar os circuitos dos inverters e as unidades de alimentação do painel LCD. Ao fazer o diagnóstico, as leituras são muitas vezes erradas especialmente por excesso de consumo em alguns elementos do circuito e placas interligadas. Existe a possibilidade de desligar a proteção de alguns circuitos integrados de modo a executar uma medição mais eficiente.
Este tipo de diagnóstico exige elevada experiência em termos de reparação uma vez que pode criar danos no circuito.Se não estiver familiarizado com este tipo de procedimentos
NÃO EXECUTE ESTE TIPO DE DIAGNÓSTICO.
Alguns dos diagnósticos não foram testados pessoalmente, por isso, se algum não funcionar, agradeço que me informem.
Protection Pin Detail Of Back-light IC's
| P.N. Reference | Description | Type | Datasheet |
|---|---|---|---|
| AAT1100 | TRIPLE CHANNEL PWM CONTROLLER | yes | |
| AAT1107 | BUCK_BOOST & BOOST PWM CONTROLLER WITH ADJUSTABLE LDO | yes | |
| AT1380A | Switching Regulator Controller for LCD Bias | yes | |
| AT1741 | 2-CHANNEL PWM CONTROLLER FOR CCFL BACKLIGHT | yes | |
| BA9741F | Two-channel switching regulator controller | yes | |
| BA9741FS | BA9741FS Large Current External FET Controller T ype Switching Regulators ROHM | yes | |
| BA9743AFV | BA9743AFV E2 Large Current External FET Controller T ype Switching Regulators | yes | |
| BA9744FV | BA9744FV Large Current External FET Controller T ype Switching Regulators ROHM | yes | |
| BD9211F | LED Driver Control IC | yes | |
| BD9215AFV | DC-AC Inverter Control IC | yes | |
| BD9222FV | DC-AC Inverter Control IC | yes | |
| BD9240 | LCD Backlight Inverter Drive IC | yes | |
| BD9240F | DC-AC Inverter Control IC | yes | |
| BD9244AFV | DC-AC Inverter Control IC | yes | |
| BD9261EFV | BD9261EFV - BD9261FP, Power Management | yes | |
| BD9270F | DC-AC Inverter Control IC | yes | |
| BD9275F | DC-AC Inverter Control IC | yes | |
| BD9397EFV | LED Drivers for LCD Backlights | White LED Driver for large LCD panel | yes |
| BD9479FV | White LED Driver for large LCD Panels (DCDC Converter type) | yes | |
| BD9486 | White LED Driver for large LCD | yes | |
| BD9777 | yes | ||
| BD9882F | DC-AC Inverter Control | yes | |
| BD9883 | DC -AC Inverter Control | yes | |
| BD9884FV | LED Driver Control IC | yes | |
| BD9886F | LED Driver Control IC | yes | |
| BD9897FS | DC - AC Inverter Control IC | yes | |
| BI3101 | BI31101A, Dual PWM Controller | Supply voltage 4.5 ~ 13.2 V Operating Ambient Temperature 0 ~ 70 ºC Operating Frequency 50K ~ 250K Hz | yes |
| BIT3102A | Low Cost PWM CCFL Controller | Vin: 4,5~13,2V Freq:50-250KHz 1 Channel | yes |
| BIT3102B | Low Cost PWM CCFL Controller | yes | |
| BIT3105 | yes | ||
| BIT3106 | High Efficiency Dual ZVS CCFL Controller | yes | |
| BIT3107 | High Efficiency ZVS CCFL Controller | yes | |
| BIT3193 | High Performance PWM Controller | Vin: 4,5~8V Freq:50-400KHz 1 Channel | yes |
| BIT3195 | High Performance PWM Controller | yes | |
| BIT3251 | Low Cost PWM Controller | Supply voltage 4 ~ 8 V Operating Ambient Temperature 0 ~ 70 ºC Operating Frequency 330K Hz | yes |
| BIT3252A | Low Cost PWM Controller | Supply voltage 4 ~ 8 V Operating Ambient Temperature 0 ~ 70 ºC Operating Frequency 330K Hz Built-in 55V NMOS | yes |
| BIT3267 | High Performance PWM Controller | Supply voltage 8 ~ 28 V Operating Ambient Temperature -20 ~ 85 ºC Operating Frequency 220K / 110KHz, 55KHz Hz | yes |
| BIT3713 | High Performance PWM Controller | Vin: 4,5~10V Freq:50-200KHz 1 Channel | yes |
| DDA009 | PWM Controller | yes | |
| DT8211 | LCD backlight inverter controller for driving CCFL | yes | |
| FAN7311 | LCD Backlight Inverter Drive IC | yes | |
| FAN7314 | LCD Backlight Inverter Drive IC | yes | |
| FAN7316 | LCD Backlight Inverter Drive IC | yes | |
| KA7500 | PULSE WIDTH MODULATION CONTROL CIRCUIT | yes | |
| LX1691 | ENHANCED MULTIMODE CCFL CONTROLLER | yes | |
| LX1692 | Full Bridge Resonant CCFL Controller | yes | |
| LX6503 | HIGH PERFORMANCE CCFL CONTROLLER | LX6503, LX6503IDW | yes |
| MB3775 | LOW VOLTAGE DUAL PWM SWITCHING
REGULATOR CONTROLLER Fujitsu | yes | |
| MP1009 | Half-Bridge and Push-Pull CCFL Inverter Controller | yes | |
| MP1038 | Full Bridge CCFL Controller | yes | |
| MP1060 | yes | ||
| OB3316 | High Performance CCFL Controller | yes | |
| OZ1060 | High-Efficiency Inverter Controller | yes | |
| OZ960 | Intelligent CCFL Inverter Controller | yes | |
| OZ962 | High-Efficiency Inverter Controller | yes | |
| OZ964 | Phase-Shift PWM Controller | yes | |
| OZ965 | High-Efficiency Inverter Controller O2Micro | yes | |
| OZ9910 | Dual Forward PWM Controller | yes | |
| OZ9937 | Universal LCDM CCFL Inverter | yes | |
| OZ9938 | LCDM Inverter Controller | yes | |
| OZ9966 | LCD Backlight Inverter Drive IC | yes | |
| OZ9967 | High frequency DC/DC boost converter controller | yes | |
| OZ9970 | Intelligent CCFL Inverter Controller | yes | |
| OZ9RR | LCD Monitor CCFL Inverter Controller O2Micro | yes | |
| SEM2005 | Halfbridge Inverter Driver IC | yes | |
| SEM2006 | CCFL Inverter Driver IC | yes | |
| SEM2105 | High Performance PWM Controller | yes | |
| SS1091ASN | CCFL Inverter Driver IC | yes | |
| TA9687 | LCDM Inverter Controller | yes | |
| TL1451A | DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS | yes | |
| TL494 | TL494, PULSE-WIDTH-MODULATION CONTROL CIRCUITS | yes | |
| TL5001 | TL5001, TL5001A PULSE-WIDTH-MODULATION CONTROL CIRCUITS | yes |
Back Light Protection Pin Detail IC's
| P.N. Reference | Protection Removal |
|---|---|
| BD8779EFV | Pin 34 → LED → Ground. |
| BD9247 | Pin 11 → 10K→ Ground. |
| BD9247F | Pin 11 → 1KΩ → Ground |
| BD9262 | Pin 25 → 10KΩ → Ground. |
| BD9276 | Pin 35 → LED → Ground. |
| BD9285F | Pin 1 → 10KΩ → Ground |
| BD9766 | Pin 20 → LED → Ground. |
| BD9893F | Pin 10 → 82k → Ground. |
| BD9896 | Pin 3 → LED → Ground. |
| EC5462 | Pin 2 → 2.2KΩ → Ground. |
| FAN3629 | Pin 15 & 16 SHORT |
| FAN3630 | Pin 17 → LED → Ground. |
| ILN816GN | Pin 8 → 10KΩ → Ground. |
| KHO803A | Pin 5 → LED → Ground. |
| KHO803A | Pin 5 → 390KΩ - 820KΩ → Ground. |
| LM2901 | Pin 6 → 82KΩ → Ground |
| MAX8722 | Pin 4 → Ground. |
| MP1006 | Pin 6 → 10KΩ → Ground. |
| MP1007E | Pin 4 → Ground. |
| MP1008 | Pin 4 → 10KΩ → Ground. |
| MP1060E | Pin 3 → LED → Ground. |
| MP1972 | Pin 15 → 10KΩ → Ground. |
| MP3389 | Pin 6 → Ground. |
| MP3810 | Pin 6 → 82KΩ → Ground. |
| MSC1692 | Pin 4 → 220KΩ → Ground. |
| OB3316QP | Pin 16 → Ground. |
| OB3350 | Pin 6 → 470KΩ → Ground. |
| OB3362RP | Pin 16 → 22KΩ → Ground. |
| OZ961 | Pin 2 → Ground. |
| OZ9611S | Pin 3 → 47KΩ → Ground. |
| OZ9643N | Pin 1 → 20Ω → Ground. |
| OZ9919GN | Pin 8 → 10KΩ → Ground. |
| OZ9939 | Pin 3 → 100KΩ → Ground. |
| OZ9972 | Pin 20 → 1KΩ → Ground. |
| OZ9976 | Pin 11 → 10KΩ → Ground. |
| OZL68GL | Pin 4 → LED → Ground. |
| OZT1060GL | Pin 1 → LED → Ground. |
| SEM2006 | Pin 5 → Ground. |
| SEM2107 | Pin 21 → LED → Ground. |
| SS1091ASN | Pin 19 → LED → Ground. |
| TPS61197 | Pin 6 → 1KΩ → Ground. |
LCD Inverters
Schematics