Why is my laptop screen turning off?

Question

Iron

Good afternoon friends. Please help me deal with the following problem...
There is a rather old laptop (acer aspire 5930), after repair (filled with juice and the power tracks burned out, after which they were re-soldered into the sc) it works relatively stably, there are no complaints.
The eternal problem of the laptop is overheating. It was decided to buy a cooling pad (powered via laptop USB) and manually raise the speed of the built-in cooler using NotebookFanControl ( the principle of operation). Everything works fine in principle, but relatively recently, during prolonged loads in games (in my case, dota 2), involuntary screen shutdowns began (no bsod and other things, it just goes out), while the equipment continues to work, the fans spin, the diodes glow (but still I'm flying out of dota, so the system still crashes, as the magazine says).
The log itself displays a Kernel Power(41) error:

spoiler

- <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
- <System>
  <Provider Name="Microsoft-Windows-Kernel-Power" Guid="{331C3B3A-2005-44C2-AC5E-77220C37D6B4}" /> 
  <EventID>41</EventID> 
  <Version>2</Version> 
  <Level>1</Level> 
  <Task>63</Task> 
  <Opcode>0</Opcode> 
  <Keywords>0x8000000000000002</Keywords> 
  <TimeCreated SystemTime="2015-09-01T14:34:40.726009200Z" /> 
  <EventRecordID>126606</EventRecordID> 
  <Correlation /> 
  <Execution ProcessID="4" ThreadID="8" /> 
  <Channel>System</Channel> 
  <Computer>Name-ПК</Computer> 
  <Security UserID="11231" /> 
  </System>
- <EventData>
  <Data Name="BugcheckCode">0</Data> 
  <Data Name="BugcheckParameter1">0x0</Data> 
  <Data Name="BugcheckParameter2">0x0</Data> 
  <Data Name="BugcheckParameter3">0x0</Data> 
  <Data Name="BugcheckParameter4">0x0</Data> 
  <Data Name="SleepInProgress">true</Data> 
  <Data Name="PowerButtonTimestamp">130855911628523350</Data> 
  </EventData>
  </Event>

and following it (but not always, today for the first time) ACPI (13):

spoiler

- <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
- <System>
  <Provider Name="ACPI" /> 
  <EventID Qualifiers="49157">13</EventID> 
  <Level>2</Level> 
  <Task>0</Task> 
  <Keywords>0x80000000000000</Keywords> 
  <TimeCreated SystemTime="2015-09-01T14:34:49.352824400Z" /> 
  <EventRecordID>126612</EventRecordID> 
  <Channel>System</Channel> 
  <Computer>Name-ПК</Computer> 
  <Security /> 
  </System>
- <EventData>
  <Data /> 
  <Binary>0000680001000000000000000D0005C000000000000000000000000000000000000000000000000019B221001111FFFF71000200111208008100040CA13128CC11120C004192010016183700660002005600760D76000000161A07008600B60BA631D4C4161A090036800100151804002390030013193100630001005300FE1073000100130A060083009700A309E801</Binary> 
  </EventData>
  </Event>

At the time of departure, the iron temperatures are, in principle, very tolerant (recorded through afterburner).

• GPU - 84°C
  
• CPU - 71°C
  

It doesn't seem to be critical (tjmax - 105°C), and no throttling was noticed before shutting down (before that, it was constantly throttling, because the cooler was not working at 100%, but there were no crashes).
And finally, we come to the question itself, what could be wrong? I am guilty of one of 3 things:

1. Does not draw out the power supply of the laptop due to the stand or the constantly maximum speed of the built-in fan.
   
2. Problems with the NotebookFanControl program, the BIOS, trying to take control of the fans, rests on the program, hence the configuration and shutdown (by the way, it all started just after installing the program).
   
3. Glitchy firewood on vidyuhi (recently updated to a new version).
   

Since I am not particularly strong in Windows errors, I ask you for help in realizing what could be wrong. Thank you very much in advance =)
Ps By the way, there is no shutdown logic, it can be cut down as well as after 15 minutes and not turn off at all in 5 hours.

Answer 1

So the screen goes blank (problems with backlights and high-voltage lamp power, for laptops and monitors of this age - a common thing) or the system crashes?
Try connecting an external monitor and play on it. Then, based on the result, take the next steps.