Modify ERROR AMPLIFIER FOR HIC1015, HIC1016

HIC1015 and HIC1016 Hybrid IC Functions, Common Failures, and Modification Guide

The HIC1015 and HIC1016 are hybrid ICs commonly found in Toshiba CRT televisions. These ICs perform several important functions in the SMPS (Switch Mode Power Supply), including voltage regulation, protection, and auxiliary power supply control.

Main Functions of HIC1015 / HIC1016

• Acts as the error amplifier that regulates and stabilizes the SMPS B+ output voltage.
• Provides protection circuits including:
  • Over Current Protection (OCP)
  • Over Voltage Protection (OVP)
  • X-Ray / EHT Protection
• Generates a regulated 9.5V auxiliary supply for the audio and video processing circuits.
• Controls the television Power ON/OFF operation.

The HIC1015 is designed for televisions with a 115V B+ supply, while the HIC1016 is intended for 125V B+ applications.

Pin Functions

Since the original datasheet is difficult to obtain, the following pin descriptions are based on practical observations during Toshiba television repairs.

• Error Amplifier Input / Over Current Protection Sensor A (connected to the SMPS B+ output)
• Over Current Protection Sensor B
• Error Amplifier Output (controls the SMPS B+ voltage)
• Reserved / Not Used
• Over Voltage Protection Input
• Protection Delay
• Ground (GND)
• Pull-up resistor connected to 21V VCC
• Power ON/OFF Control Input (High ≈ 0.8V = ON, 0V = OFF)
• Burst Delay Capacitor
• 21V VCC
• Switched 9.5V Auxiliary Regulator Output
• Reserved / Not Used
• X-Ray / EHT Protection Input
• 5V VCC
• Protection Output (Normal = 5V, Protection = 0V)
• Ground (GND)

Common Failure Symptoms

Based on repair experience, the most common failure of the HIC1015/HIC1016 is damage to the internal error amplifier.

When this happens, the SMPS can no longer regulate the B+ voltage correctly. In severe cases, the B+ voltage may rise to approximately 160V. Because the IC still activates the over-voltage protection circuit, the television usually powers on for a few seconds before returning to standby protection mode.

HIC1015 Error Amplifier Modification

The most common repair method is replacing the damaged internal error amplifier using a Sanken Error Amplifier (SE).

• Use SE115 for HIC1015 (115V B+).
• Use SE125 for HIC1016 (125V B+).

Modification Procedure

1. Verify that the television can still be switched ON and OFF by the system control IC.
2. If the HIC package is physically damaged (burned or cracked), replace the IC instead of modifying it.
3. Remove the hybrid IC from the PCB.
4. Cut or isolate Pin 3 before reinstalling the IC.
5. Install the Sanken Error Amplifier as follows:
   • SE Pin 1 → SMPS B+ output (positive terminal of the filter capacitor)
   • SE Pin 2 → Feedback line
   • SE Pin 3 → Ground (negative terminal of the filter capacitor)
6. Install a 4.7kΩ resistor in parallel with the optocoupler LED (anode to cathode). On many Toshiba boards this location is marked as R881, although it is usually left uninstalled.
7. Power on the television and verify that the B+ voltage is correctly regulated.

Figure 1. HIC1015 error amplifier modification using a Sanken SE115/SE125 module.

Figure 2. Installing a 4.7kΩ resistor across the optocoupler LED terminals (R881 position).

Possible Issues After Modification

During testing, no significant problems were encountered after performing this modification.

However, if the B+ voltage fluctuates without load, replacing the PC817 optocoupler (or an equivalent component) usually resolves the problem.

Total HIC1015 / HIC1016 Replacement

If the hybrid IC is severely damaged, the error amplifier modification may no longer be possible.

A complete replacement circuit can be built using:

• Sanken Error Amplifier (SE115 or SE125)
• KA78R09 voltage regulator
• Supporting resistors
• Power ON/OFF control circuit

Although this method restores basic functionality, it disables several original protection circuits. Therefore, a complete replacement is not recommended unless absolutely necessary.

Conclusion

The HIC1015 and HIC1016 are essential hybrid ICs used in Toshiba CRT televisions for SMPS regulation, protection, and auxiliary power supply generation. Most failures originate from the internal error amplifier, causing unstable B+ voltage and standby protection. Replacing the damaged error amplifier with a Sanken SE115 or SE125 module is a practical repair solution while preserving most of the original circuit functions.

Article Source: ZaenalElektronic

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