How to remove LED tv LX1691 ic protection

LX1691 Diagnosing and repairing inverters and power supply units within LCD panels can be challenging. Meter readings are often inaccurate, especially when there is overconsumption in certain circuit elements or other connected PCBs. In some cases, it's possible to disable the protection of integrated circuits to take more precise measurements.

This type of diagnosis requires advanced repair experience, as it poses a risk of damaging the circuits. If you're not familiar with these procedures, DO NOT ATTEMPT THIS TYPE OF DIAGNOSIS.

All ICs list :-
AAT1100
AAT1107
AT1380A
AT1741
BA9741F
BA9741FS
BA9743AFV
BA9744FV
BD9211F
BD9215AFV
BD9222FV
BD9240
BD9240F
BD9244AFV
BD9261EFV
BD9270F
BD9275F
BD9397EFV
BD9479FV
BD9486
BD9777
BD9882F
BD9883
BD9884FV
BD98867
BD9897FS
BI3101
BIT3102A
BIT3102B
BIT3105
BIT3106
BIT3107
BIT3193
BIT319
BIT3251
BIT3252A
BIT3267
BIT3713
DDA009
DD8211
FAN7311
FAN7314
FAN7316
KA7500
LX1691
LX1692
LX6503
MB3775
MP1009
MP1038
MP1060
OB3316
OZ1060
OZ960
OZ962
OZ964
OZ965
OZ9910
OZ9937
OZ9938
OZ9966
OZ9967
OZ9970
OZ9RR
SEM2005
SEM2006
SEM2105
SS1091ASN
TL1451A
TL494
TL5001
BD8779EFV
BD9247
BD9247F
BD9262
BD9276
BD9285F
BD9766
BD9893F
BD9896
EC5462
FAN3629
FAN3630
ILN816GN
KHO803A
KHO803A
LM2901
MAX8722
MP1006
MP1007E
MP1008
MP1060E
MP1972
MP3389
MP3810
MSC1692
OB3316QP
OB3350
OB3362RP
OZ961
OZ9611S
OZ9643N
OZ9919GN
OZ9939
OZ9972
OZ9976
OZL68GL
OZT1060GL
SEM2006
SEM2107
SS1091ASN
TPS61197
Removing or bypassing IC protection in LED TVs, such as in **inverter ICs, driver ICs, or PWM ICs**, is a complex task requiring expertise in electronics and circuit design. These ICs are typically equipped with protective mechanisms to safeguard against conditions like overcurrent, overvoltage, thermal overload, and short circuits. Understanding these mechanisms is essential before attempting any modifications.

The first step is to analyze the IC and its associated circuit. Start by acquiring the IC’s datasheet, which provides detailed information on its features, pin configurations, and protection functionalities. Using the datasheet and the TV’s schematic, trace the connections and identify the external components like resistors and capacitors that influence the IC’s protection. A diagnostic process follows, using tools like an oscilloscope to observe waveforms and a multimeter to measure voltages and resistances at critical points. This will help determine if the protection mechanisms are falsely triggered or if they are responding correctly to an actual fault.

LX1691 To bypass or adjust these protections, focus on the external components tied to the IC. For instance, overcurrent protection often relies on a sense resistor; increasing its value slightly can raise the current threshold. Similarly, voltage dividers controlling feedback or sense pins can be adjusted to alter overvoltage or undervoltage limits. For timing-related protections, modifying capacitor values that influence soft-start circuits may help delay the trigger. In some cases, you can bypass the protection pins directly by connecting resistors or shorting specific connections, but this should be done cautiously to avoid completely disabling essential safeguards.

Another approach involves addressing potential hardware faults. Often, protections are activated due to damaged components like shorted MOSFETs, failed diodes, or degraded capacitors. Replacing these components can restore normal operation without altering the IC’s protection features. For ICs controlled via firmware, reprogramming might be necessary to modify software-based restrictions. This requires the appropriate programming tools and knowledge of the firmware structure.

After making modifications, testing is critical to ensure the system operates as intended. Begin with a controlled power-up using a current-limited power supply. Monitor output waveforms, voltages, and temperatures to confirm that the protections no longer interfere unnecessarily, while ensuring the TV remains stable under normal and stress conditions.

It’s important to approach these tasks with caution. Removing or bypassing protections can expose the system to risks like overheating, electrical failures, and permanent damage. Always prioritize safety by using insulated tools, discharging capacitors, and wearing protective equipment. Furthermore, tampering with IC protections might void warranties and could be against manufacturer guidelines, so consider professional repair services if you are unsure about the process.

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