Symptoms:

Amplifier consumes approximately 630 mA quiescent current with no load connected.

All driver transistors in the output stage (for all 4 channels) are running hot.

All output transistors, diodes, ICs, and capacitors have already been checked and/or replaced.

Tests Performed:

1. Verified power supply rails are stable and within specification.

2. Checked biasing resistors and emitter resistors for drift or incorrect values.

3. Inspected PCB for possible leakage paths, solder bridges, or damaged traces.

4. Replaced electrolytic capacitors in both power supply and audio sections.

5. Output stage power transistors tested OK (no shorts or leakage).

Issue:

Despite the above, high idle current and overheating of the driver stage persists.

Request:

Looking for guidance on:

Possible causes of excessive idle current in the driver stage.

Recommended next steps for isolating whether the problem is related to bias circuit, thermal tracking, or feedback loop instability.

Please help me

⟐ Edited March 20, 2026 at 19:38 MST

⟐ Commented April 15, 2023 at 10:51 MST

My avh 201ex double din suddenly turned off once going to work like a 3 weeks ago. And this morning in the a.m. it turned on when i moved my car, but in the afternoon i checked again and screen was black again. I had already opened up the console and check for burnt fuses and loose wiring but everything seemed to be intact. I thought the stereo didnt work anymore but since it turned on this morning, im guessing it still does. What can it be??? Any help would be appreciated. Thanks!!

Does anyone know why this happens and how can i fix it?

That is problem 1: metra adapter 70-8113 has 4 rca plugs ( gray for right front, white for left front, purple for right rear, and green for left rear. Pioneer deh-x6700bs has 6 rca inputs (rear right and rear left on back of head unit, with front right and front left below them, and 2 subwoofer rca inputs below them), and I don’t know which plug goes to which input to get sound out of all 6 speakers and the subwoofer?

Problem 2 is that not knowing the answer to problem 1, I have tried every combination and not had success, either meaning I am wiring wrong or something internal to the radio is not working. One combination using y adapters to plug all 4 rcas on adapter to the 2 subwoofer rcas only will give me sound out of 4-6 speakers but not the subwoofer and sound is distant and muffled, another combination not using y adapters, with 2 rcas to front and rear wires to subwoofer rca inputs on pioneer headunit gives great clear sound out of all front but no rear or subwoofer, another combination not using pioneer headunit subwoofer rcas at all gives great clear sound out of 4 door speakers but not the front dash speakers or subwoofer. I do not know if this implies an internal headunit problem? If so, who repairs aftermarket radios?

Additionally, I have read that a speaker wire touching a ground could damage the internal headunit amplifier. I believe some touching of one of the speaker wires took place, causing an amp error message on headunit. I since then fixed that wire and have not had any more amp error messages, but did not know if that could be connected to my problems, or if hearing any sound would imply that the headunit internal amp is probably fine?

Any help would be appreciated.

Thanks. Jimmy

What do I do

⟐ Commented July 19, 2020 at 0:10 MST

⟐ Commented April 26, 2020 at 9:24 MST

⟐ Commented December 03, 2019 at 2:56 MST

⟐ Edited September 23, 2020 at 5:01 MST

⟐ Answer edited August 07, 2019 at 9:59 MST

I'm looking for any teardown guides that show how to dismantle a car DVD player with a retractable screen. Any guide for any model will do, I'm just looking for a general idea on where to start.

Something like this: http://www.4tuning.ro/images/dvd-ripspee...

Any assistance appreciated!

Thanks!

⟐ Answer deleted August 07, 2019 at 8:52 MST