CRT TV No Sound? Here’s the Repair Solution

Introduction :

A common issue with CRT TVs is the no sound problem.CRT TV No Sound This can be due to various faults, including speaker failure, faulty audio IC, capacitor leakage, resistor burnout, or power supply issues. In this guide, we will cover step-by-step troubleshooting with voltage testing points to help you fix the problem.

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1. Check Basic Sound Settings

• Ensure the TV is not muted.
• Increase volume from both the remote and physical buttons.
• Check for sound with external AV sources (DVD player, set-top box, etc.).

2. Test the Internal Speaker

• Use a multimeter to check resistance (8Ω or 16Ω expected).
• If resistance is infinite, replace the speaker.
• Voltage at speaker terminals should be 1V to 5V AC when sound is active.

Common Speaker Values by Brand:

Brand	Model	Speaker Impedance	Speaker Wattage
Sony	KV-21FA210	8Ω	5W
Samsung	CS-21K40ML	8Ω	3W
LG	21FS2RG-T3	16Ω	5W
Panasonic	TC-21FX50	8Ω	4W
Philips	21PT3525	16Ω	6W
Onida	CO21FGR	8Ω	5W
Videocon	BAZOOKA21X	8Ω	4W
BPL	FENNEC21HD	16Ω	6W

3. Check the Audio IC and Power Supply

Common Audio ICs & Voltage Testing:

Brand	Model	Audio IC	VCC Voltage	Output Voltage
Sony	KV-21FA210	TDA7267A	12V-18V	5V-10V AC
Samsung	CS-21K40ML	TDA2003	12V	4V-8V AC
LG	21FS2RG-T3	TDA7056	12V-15V	3V-6V AC
Onida	CO21FGR	LA4440	12V-15V	5V-9V AC
Videocon	BAZOOKA21X	TDA7297	15V-18V	6V-12V AC
BPL	FENNEC21HD	TDA2822	9V-12V	3V-6V AC

• If VCC is missing, check power transistors and diodes.
• If VCC is present but no output, replace the audio IC.

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4. Check Capacitors and Resistors

Position	Value	Function
C501	1000µF 25V	Power filtering
C502	470µF 16V	Audio smoothing
C503	220µF 25V	Noise filtering
C504	330µF 35V	Voltage stabilization
R201	2.2Ω	Speaker protection
R202	4.7Ω	Audio signal control
R203	1KΩ	Audio feedback control
R204	10Ω	Power regulation

Replace any faulty components to restore sound output.

5. Check the Earphone Jack (If Available)

• A faulty earphone jack can mute the speakers.
• Clean the jack or replace it.

✅ Voltage Testing:

• Measure continuity with a multimeter.
• If the jack is stuck, it will show 0Ω resistance.

6. Power Supply Issues Affecting Audio

• If the 12V-18V power rail is missing, check nearby power transistors and diodes.

Common Power Section Components:

Position	Component	Function	Voltage
D601	1N4007	Rectifier diode	12V-18V
Q601	2SC1815	Voltage regulator	12V
C601	470µF 35V	Power filter capacitor	35V
D602	BY127	Power rectifier	15V
Q602	TIP41C	Voltage amplifier	18V
C602	1000µF 50V	Audio power filter	50V
R601	22Ω	Power surge protection
R602	1.5KΩ	Voltage divider

✅ Voltage Testing:

• Check power input voltage to the Audio IC.
• If missing, trace back to power section and replace faulty components.

Final Checks & Testing

• Power on the TV and test for sound.
• If still not working, check EEPROM IC settings (rare cases).

Conclusion

CRT TV No Sound issues follow this guide easy to repair.

• Summarize all troubleshooting steps.
• Encourage readers to comment if they need more help.
• Suggest professional repair if none of the above solutions work.

🚀CRT TV No Sound more than information you want please comments below!

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CRT TV other problem’s solution’s links :

• want more video’s are guide click here
• fix low or distorted audio in crt tv’sguide
• crt tv microcontroller and eeprom repair

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