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Hi It seems your TV set has a problem in the R ( red) gun in the RGB circuit. It means that the red color circuit is missing. To fix this fault it requires some knowledge in electronics and is a good challenge for an electronics hobbist. Generally is a faulty RGB output transistor on the small board attached to the CRT neck. To trace it, mesure the voltages in the colector of the three big transistors on the mentioned board. One of them may have low voltage or even none. That is the culprit. Replace it and you are done.
1) test the adaptor for mesuring the output read the label, see how many volts DC, and take the measure with VOM. if there aRE not Voltage the adaptor is faulty, or if the voltage are out of Range. God bless you
Problem could be the alternator ( battery charger), seems like it doesn't charge battery. You can test it With a DC meter , with your van Stopped mesure DC voltage (should be around 12 V) , when running should be around 13 V (Depending on the regulator) . Hope this help you to fix your issue
The fact you have output from the headphones is a good sign. It shows the main amp is working fine. However water has clearly got inside something and affected it. The best course of action is to trace back the wires from the headphone socket and see if there is a relay or anything that could get water in it. If you do find something, try applying warm air from a hairdryer. The alternative is to apply a soldering iron to the solder conections of the device. This should get rid of any water inside. If all else fails you might have to replace the relay. But I would try a spray of Servisol first. Just in case some dust has got inside or mineral salt from the water.
LED are diodes that operate around 2volts DC. A resistor must be soldered in series with anode or cathod side of diode if connecting to 12 volts DC. Anode to ground....if unsure start with 10k resistor and check voltage and work your way down to around 1.8 volts is ideal
take an ohm meter you can buy for ten bucks at radio shack put the volt meter on DC volts plug the charger into the battery charger end the black lead goes tothe outside and the red goes inside, set the meter for 12 volts dv and mesure the voltage. read the voltage output on the battery charger transformer see if it's within a half volt if not the charger is bad, if it's ok then use rubbing achol and a q tip to clean the battery connectors on the computer and the battery itself, if you do not get the light then pull the battery out and hold the power button in the on postion and hold the enter key for 1 minute and try again, if the lights do not come back on your battery is dead, if the computer will still boot with the battery then the charger is working if it won't boot up the battery is dead. Got it?
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You need to measure the voltages at the output transistors. The previous "driver" stage may have a problem. These outputs use .6V as the bias differential. Check for DC voltage on the inputs to the transistors. These are standard designs. I'd check for DC anywhere along the signal path.