I replaced my mini component stereo (360 watt) speakers with new speakers that apparently can handle up to 600 watts. If the volume is too high on the receiver, the power cuts out. I think this is because the new speakers are drawing too much power, but i dont want to spend money on a new expensive receiver. Any cheap solutions like power amplifiers that might solve this problem?

Overheating - power supply issue - failed internal components. Take to an LG Service Centre.

LG CM9730 - Mini Hi Fi System & Audio - LG Electronics

https://www.lg.com > ... > Home Theatre Systems
LG X-BOOM CM9730 · SOUND. Afro Hip-hop: Yes. Auto EQ · PHYSICAL. Carton Size (W x H x D) mm: Main : 631 x 423 x 537 Spk : 1301 x 865 x 639. Gross Weight (Kg) ...
Audio In - Aux: Yes(Rear)
Portable In: Yes (Front)

LG CM9730 - Super Power Mini Hi-Fi System 2300 Watts

https://www.lg.com > ... > TV/AUDIO/VIDEO > Audio
LG CM9730 - Super Power Mini Hi-Fi System 2300 Watts with Smart DJ, Bluetooth Streaming, USB Direct Recording and LED Lighting.
Front Speakers: 520mm x 720mm x 498mm
Portable Input (3.5mm): Yes (1)
Weight (Speakers): 71kg
Weight (Unit): 9.8kg

LG CM9730 ' LG New Zealand

https://www.lg.com > Home > TV/Audio/Video > Audio
Get more information on the LG CM9730. ... CM9730. Super Power Mini Hi-Fi System 2300 Watts ... Output: 575W x 4. Sound System: Bi-Amplified Stereo - 3 Way ...
Weight (Speakers): 71kg
Weight (Unit): 9.8kg
Front Speakers: 520mm x 720mm x 498mm
Battery: Yes (AAA x 2)

Check resister across back of speaker........most likely burned out.

If you are using the factory installed speakers they aren't made for the wattage output of your receiver. Factory stereos only put out about 5 to 10 watts. If you want to play it really loud you need to replace them with speakers that have a higher wattage that what your receiver puts out, which is a maximum of 50 watts

• frequency response: 24-200 Hz
• power handling: 300-600 watts RMS (300 watts per coil)
• peak power: 1,800 watts
• sensitivity: 85 dB
• top-mount depth: 6-3/8"
• sealed box volume: 0.65-1.25 cu. ft.
• ported box volume: 1.0-2.0 cu. ft.
• Crutch field audio has a DIY section on box building ;)

Yes they will, but alway be careful with audio gear.
There are 30 watt speakers that can handle peaks of 500 watts for a short time. There are also 500 watt speakers I can "kill" with a peak less than 500 watt.
Most amplifier manufactures like to boost about the power an amplifier can deliver and their speakers can handle. But as long as they don't tell how long the speaker can handle the power and at what frequencies the value does not say anything.
Whit high power amplifiers, never switch over while the volume if at maximum.
You know what I mean. I can't hear my CD player. first turn the volume to the max and then press the CD button, and the speakers will explode. Always when you preaa any button on the pre amp juts lower de volume first and you won't destroy your speakers.
My old Kef Concerto's are almost 40 years of age. 30 watt and are running on a 500 watt Yamaha amplifier for years now. And believe me my chidden know how to punish a speaker. Never any problem, nr with the speakers, nor with the amplifiers.

it should still play watts ae just a way to rate how much a speaker will take before damage

42PG20 Connections

• Connector Type
  
• 1 x Composite video/audio input ( RCA phono x 3 ) - Rear ,
  
• 1 x S-Video input ( 4 pin mini-DIN ) -
• Rear , 1 x Digital audio output (optical) ( TOSLINK ) - Rear ,
• 1 x Remote control ( Mini-phone 3.5 mm ) - Rear ,
  
• 1 x Serial ( 9 pin D-Sub ) - Rear ,
  
• 2 x Component video input ( RCA phono x 3 ) - Rear ,
  
• 2 x Audio line-in ( RCA phono x 2 ) - Rear ,
  
• 2 x HDMI input ( 19 pin HDMI Type A ) - Rear ,
  
• 1 x VGA input ( 15 pin HD D-Sub (HD-15) ) - Rear ,
  
• 1 x Audio line-in ( Mini-phone stereo 3.5 mm ) - Rear ,
  
• 1 x Composite video/audio input ( RCA phono x 3 ) - Side ,
  
• 1 x HDMI input ( 19 pin HDMI Type A ) - Side

42PG20 Audio System

• Sound Output Mode Stereo
• Surround Mode Yes
• Sound Effects SRS TruSurround XT
• Audio Controls Bass , Treble , Balance , Sound mode
• Speakers Included 2 speakers
• Output Power / Total 20 Watt
• Additional Features Auto volume adjustment
• Speaker(s) 2 x Right/left channel speaker - Built-in - 10 Watt

• 10" subwoofer with dual 4-ohm voice coils
• Kevlar reinforced pulp cone with Santoprene™ rubber surround
• cast aluminum frame with perimeter venting
• frequency response: 26-600 Hz
• power handling: 200-500 watts RMS (250 watts per coil)
• peak power: 1,500 watts
• sensitivity: 83 dB
• top-mount depth: 6-7/8"
• sealed box volume: 0.5-0.8
• ported box volume: 0.6-1.3

Yes , you can replace the 15 watt speaker with the 50 watt speaker. The impedance of both speakers (4ohms) is the same , so that's a match. Actually, the 50 watt speaker may sound a bit better at higher volume, because it will not distort as much as the 15 watt speaker. Hope this helps...

have u check the radio out do u have an eq